NSRunloop簡單細(xì)說（二）—— 獲取運(yùn)行循環(huán)及其模式

版本記錄

版本號	時間
V1.0	2017.08.22

前言

NSRunloop是OC Foundation框架中非常重要的一個類叠必，很多時候我們會使用它抵皱，但是未必對其有深入的了解帖汞，接下來幾篇我就會帶著大家重新學(xué)習(xí)一下NSRunloop這個類，從簡單到復(fù)雜砾肺，從基本到深化挽霉，我會一步步的走完。希望對大家有所幫助变汪。感興趣的可以看我上一篇侠坎。
1. NSRunloop簡單細(xì)說（一）—— 整體了解

一、 @property(class, readonly, strong) NSRunLoop *currentRunLoop;

該屬性的作用是：獲取當(dāng)前線程的runloop模式裙盾，是一個只讀屬性实胸。這里還要注意：

如果線程不存在運(yùn)行循環(huán)，則創(chuàng)建并返回一個番官。

下面看一下代碼庐完。

- (void)demoCurrentRunLoop
{
    NSLog(@"currentRunLoop1 = %@", [NSRunLoop currentRunLoop]);
    
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSLog(@"currentRunLoop2 = %@", [NSRunLoop currentRunLoop]);
    });
}

下面我們看輸出，這個輸出還是很長的徘熔。

currentRunLoop1

2017-08-22 23:26:46.152 JJOC[3275:96954] currentRunLoop1 = <CFRunLoop 0x6000001756c0 [0x1058bbe40]>{wakeup port = 0x2103, stopped = false, ignoreWakeUps = true, 
current mode = UIInitializationRunLoopMode,
common modes = <CFBasicHash 0x60000005d850 [0x1058bbe40]>{type = mutable set, count = 2,
entries =>
    0 : <CFString 0x107e4c6c0 [0x1058bbe40]>{contents = "UITrackingRunLoopMode"}
    2 : <CFString 0x105893970 [0x1058bbe40]>{contents = "kCFRunLoopDefaultMode"}
}
,
common mode items = <CFBasicHash 0x60000005d700 [0x1058bbe40]>{type = mutable set, count = 16,
entries =>
    0 : <CFRunLoopSource 0x608000175480 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = PurpleEventSignalCallback (0x10ae9a723)}}
    1 : <CFRunLoopObserver 0x608000136800 [0x1058bbe40]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}
    2 : <CFRunLoopObserver 0x6080001368a0 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}
    3 : <CFRunLoopSource 0x608000176080 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x600000136bc0, callout = __handleEventQueue (0x1077840d0)}}
    4 : <CFRunLoopSource 0x608000176e00 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 29187, subsystem = 0x10c90bf60, context = 0x6000000ba460}}
    5 : <CFRunLoopSource 0x600000176500 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x600000262700, callout = FBSSerialQueueRunLoopSourceHandler (0x10c526ca6)}}
    7 : <CFRunLoopSource 0x600000175cc0 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3703, callout = PurpleEventCallback (0x10ae9cc58)}}
    9 : <CFRunLoopObserver 0x608000136300 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv (0x106320ac4), context = <CFRunLoopObserver context 0x0>}
    10 : <CFRunLoopObserver 0x608000136260 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = _afterCACommitHandler (0x106fb64d7), context = <CFRunLoopObserver context 0x7fa063f00ac0>}
    11 : <CFRunLoopSource 0x608000175c00 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x60000005eae0, callout = __handleHIDEventFetcherDrain (0x10778588c)}}
    12 : <CFRunLoopSource 0x608000176140 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 23311, subsystem = 0x107e12b10, context = 0x0}}
    13 : <CFRunLoopObserver 0x608000136080 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = _beforeCACommitHandler (0x106fb645c), context = <CFRunLoopObserver context 0x7fa063f00ac0>}
    14 : <CFRunLoopSource 0x608000176a40 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 27403, subsystem = 0x107e294f0, context = 0x60800003e280}}
    18 : <CFRunLoopSource 0x600000175780 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b6a0 [0x1058bbe40]>{valid = Yes, port = 1c03, source = 0x600000175780, callout = _ZL27change_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627f9f7), context = <CFMachPort context 0x0>}}
    21 : <CFRunLoopObserver 0x600000136d00 [0x1058bbe40]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = _UIGestureRecognizerUpdateObserver (0x1074adb1b), context = <CFRunLoopObserver context 0x6000000da470>}
    22 : <CFRunLoopSource 0x600000175900 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b5f0 [0x1058bbe40]>{valid = Yes, port = 2503, source = 0x600000175900, callout = _ZL26power_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627fb06), context = <CFMachPort context 0x0>}}
}
,
modes = <CFBasicHash 0x60000005d820 [0x1058bbe40]>{type = mutable set, count = 5,
entries =>
    2 : <CFRunLoopMode 0x6000001933f0 [0x1058bbe40]>{name = UITrackingRunLoopMode, port set = 0x2703, queue = 0x600000175c00, source = 0x6000001d1580 (not fired), timer port = 0x2903, 
    sources0 = <CFBasicHash 0x60000005d5b0 [0x1058bbe40]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x608000175480 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = PurpleEventSignalCallback (0x10ae9a723)}}
    3 : <CFRunLoopSource 0x608000176080 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x600000136bc0, callout = __handleEventQueue (0x1077840d0)}}
    4 : <CFRunLoopSource 0x600000176500 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x600000262700, callout = FBSSerialQueueRunLoopSourceHandler (0x10c526ca6)}}
    5 : <CFRunLoopSource 0x608000175c00 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x60000005eae0, callout = __handleHIDEventFetcherDrain (0x10778588c)}}
}
,
    sources1 = <CFBasicHash 0x60000005d580 [0x1058bbe40]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x608000176e00 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 29187, subsystem = 0x10c90bf60, context = 0x6000000ba460}}
    1 : <CFRunLoopSource 0x608000176140 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 23311, subsystem = 0x107e12b10, context = 0x0}}
    3 : <CFRunLoopSource 0x600000175780 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b6a0 [0x1058bbe40]>{valid = Yes, port = 1c03, source = 0x600000175780, callout = _ZL27change_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627f9f7), context = <CFMachPort context 0x0>}}
    4 : <CFRunLoopSource 0x600000175900 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b5f0 [0x1058bbe40]>{valid = Yes, port = 2503, source = 0x600000175900, callout = _ZL26power_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627fb06), context = <CFMachPort context 0x0>}}
    5 : <CFRunLoopSource 0x608000176a40 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 27403, subsystem = 0x107e294f0, context = 0x60800003e280}}
    6 : <CFRunLoopSource 0x600000175cc0 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3703, callout = PurpleEventCallback (0x10ae9cc58)}}
}
,
    observers = (
    "<CFRunLoopObserver 0x608000136800 [0x1058bbe40]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x600000136d00 [0x1058bbe40]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = _UIGestureRecognizerUpdateObserver (0x1074adb1b), context = <CFRunLoopObserver context 0x6000000da470>}",
    "<CFRunLoopObserver 0x608000136080 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = _beforeCACommitHandler (0x106fb645c), context = <CFRunLoopObserver context 0x7fa063f00ac0>}",
    "<CFRunLoopObserver 0x608000136300 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv (0x106320ac4), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x608000136260 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = _afterCACommitHandler (0x106fb64d7), context = <CFRunLoopObserver context 0x7fa063f00ac0>}",
    "<CFRunLoopObserver 0x6080001368a0 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = (null),
    currently 525108406 (10580007687927) / soft deadline in: 1.84467335e+10 sec (@ -1) / hard deadline in: 1.84467335e+10 sec (@ -1)
},

    3 : <CFRunLoopMode 0x608000193590 [0x1058bbe40]>{name = GSEventReceiveRunLoopMode, port set = 0x2f03, queue = 0x608000175540, source = 0x6080001d2570 (not fired), timer port = 0x3103, 
    sources0 = <CFBasicHash 0x60800005e9c0 [0x1058bbe40]>{type = mutable set, count = 1,
entries =>
    0 : <CFRunLoopSource 0x608000175480 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = PurpleEventSignalCallback (0x10ae9a723)}}
}
,
    sources1 = <CFBasicHash 0x60800005e990 [0x1058bbe40]>{type = mutable set, count = 1,
entries =>
    1 : <CFRunLoopSource 0x600000175d80 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3703, callout = PurpleEventCallback (0x10ae9cc58)}}
}
,
    observers = (null),
    timers = (null),
    currently 525108406 (10580009074827) / soft deadline in: 1.84467335e+10 sec (@ -1) / hard deadline in: 1.84467335e+10 sec (@ -1)
},

    4 : <CFRunLoopMode 0x6000001934c0 [0x1058bbe40]>{name = kCFRunLoopDefaultMode, port set = 0x2203, queue = 0x600000175840, source = 0x6000001d13a0 (not fired), timer port = 0x2403, 
    sources0 = <CFBasicHash 0x60000005d6d0 [0x1058bbe40]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x608000175480 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = PurpleEventSignalCallback (0x10ae9a723)}}
    3 : <CFRunLoopSource 0x608000176080 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x600000136bc0, callout = __handleEventQueue (0x1077840d0)}}
    4 : <CFRunLoopSource 0x600000176500 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x600000262700, callout = FBSSerialQueueRunLoopSourceHandler (0x10c526ca6)}}
    5 : <CFRunLoopSource 0x608000175c00 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x60000005eae0, callout = __handleHIDEventFetcherDrain (0x10778588c)}}
}
,
    sources1 = <CFBasicHash 0x60000005d6a0 [0x1058bbe40]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x608000176e00 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 29187, subsystem = 0x10c90bf60, context = 0x6000000ba460}}
    1 : <CFRunLoopSource 0x608000176140 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 23311, subsystem = 0x107e12b10, context = 0x0}}
    3 : <CFRunLoopSource 0x600000175780 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b6a0 [0x1058bbe40]>{valid = Yes, port = 1c03, source = 0x600000175780, callout = _ZL27change_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627f9f7), context = <CFMachPort context 0x0>}}
    4 : <CFRunLoopSource 0x600000175900 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x60000015b5f0 [0x1058bbe40]>{valid = Yes, port = 2503, source = 0x600000175900, callout = _ZL26power_notify_port_callbackP12__CFMachPortPvlS1_ (0x10627fb06), context = <CFMachPort context 0x0>}}
    5 : <CFRunLoopSource 0x608000176a40 [0x1058bbe40]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 27403, subsystem = 0x107e294f0, context = 0x60800003e280}}
    6 : <CFRunLoopSource 0x600000175cc0 [0x1058bbe40]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3703, callout = PurpleEventCallback (0x10ae9cc58)}}
}
,
    observers = (
    "<CFRunLoopObserver 0x608000136800 [0x1058bbe40]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x600000136d00 [0x1058bbe40]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = _UIGestureRecognizerUpdateObserver (0x1074adb1b), context = <CFRunLoopObserver context 0x6000000da470>}",
    "<CFRunLoopObserver 0x608000136080 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = _beforeCACommitHandler (0x106fb645c), context = <CFRunLoopObserver context 0x7fa063f00ac0>}",
    "<CFRunLoopObserver 0x608000136300 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv (0x106320ac4), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x608000136260 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = _afterCACommitHandler (0x106fb64d7), context = <CFRunLoopObserver context 0x7fa063f00ac0>}",
    "<CFRunLoopObserver 0x6080001368a0 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = _wrapRunLoopWithAutoreleasePoolHandler (0x106f83de6), context = <CFArray 0x60800005f410 [0x1058bbe40]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = <CFArray 0x6000000ba6a0 [0x1058bbe40]>{type = mutable-small, count = 1, values = (
    0 : <CFRunLoopTimer 0x600000175fc0 [0x1058bbe40]>{valid = Yes, firing = No, interval = 0, tolerance = 0, next fire date = 525108408 (1.41212302 @ 10581423929411), callout = (Delayed Perform) UIApplication _accessibilitySetUpQuickSpeak (0x1047d118f / 0x1073e6c55) (/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/UIKit.framework/UIKit), context = <CFRunLoopTimer context 0x600000260500>}
)},
    currently 525108406 (10580009118217) / soft deadline in: 1.41481117 sec (@ 10581423929411) / hard deadline in: 1.41481113 sec (@ 10581423929411)
},

    5 : <CFRunLoopMode 0x600000193800 [0x1058bbe40]>{name = UIInitializationRunLoopMode, port set = 0x4523, queue = 0x6000001765c0, source = 0x6000001d1a30 (not fired), timer port = 0x4723, 
    sources0 = <CFBasicHash 0x60000005fef0 [0x1058bbe40]>{type = mutable set, count = 1,
entries =>
    2 : <CFRunLoopSource 0x600000176500 [0x1058bbe40]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x600000262700, callout = FBSSerialQueueRunLoopSourceHandler (0x10c526ca6)}}
}
,
    sources1 = <CFBasicHash 0x60000005ff20 [0x1058bbe40]>{type = mutable set, count = 0,
entries =>
}
,
    observers = (
    "<CFRunLoopObserver 0x608000136300 [0x1058bbe40]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv (0x106320ac4), context = <CFRunLoopObserver context 0x0>}"
),
    timers = (null),
    currently 525108406 (10580011879022) / soft deadline in: 1.84467335e+10 sec (@ -1) / hard deadline in: 1.84467335e+10 sec (@ -1)
},

    6 : <CFRunLoopMode 0x6000001938d0 [0x1058bbe40]>{name = kCFRunLoopCommonModes, port set = 0x6007, queue = 0x600000176380, source = 0x6000001d1c10 (not fired), timer port = 0x6203, 
    sources0 = (null),
    sources1 = (null),
    observers = (null),
    timers = (null),
    currently 525108406 (10580012030882) / soft deadline in: 1.84467335e+10 sec (@ -1) / hard deadline in: 1.84467335e+10 sec (@ -1)
},

}
}

currentRunLoop2

2017-08-22 23:26:46.155 JJOC[3275:97472] currentRunLoop2 = <CFRunLoop 0x608000176440 [0x1058bbe40]>{wakeup port = 0x7303, stopped = false, ignoreWakeUps = true, 
current mode = (none),
common modes = <CFBasicHash 0x60800005fb00 [0x1058bbe40]>{type = mutable set, count = 1,
entries =>
    2 : <CFString 0x105893970 [0x1058bbe40]>{contents = "kCFRunLoopDefaultMode"}
}
,
common mode items = (null),
modes = <CFBasicHash 0x60800005fda0 [0x1058bbe40]>{type = mutable set, count = 1,
entries =>
    2 : <CFRunLoopMode 0x6080001946a0 [0x1058bbe40]>{name = kCFRunLoopDefaultMode, port set = 0x7403, queue = 0x608000176f80, source = 0x6080001d2840 (not fired), timer port = 0x7603, 
    sources0 = (null),
    sources1 = (null),
    observers = (null),
    timers = (null),
    currently 525108406 (10580015258087) / soft deadline in: 1.84467335e+10 sec (@ -1) / hard deadline in: 1.84467335e+10 sec (@ -1)
},

}
}

結(jié)論：輸出的東西很多還很長门躯，具體什么意思后面會和大家說，這里大家只要知道currentRunLoop1 = <CFRunLoop 0x6000001756c0...和currentRunLoop2 = <CFRunLoop 0x608000176440...酷师。它們是兩個不同的對象讶凉。

二、@property(readonly, copy) NSRunLoopMode currentMode;

這里currentMode的意思就是運(yùn)行循環(huán)的模式山孔，我們每一個RunLoop在運(yùn)行的時候都是在某一個模式或者模式的組合上運(yùn)行的懂讯。

這里NSRunLoopMode模式是一個字符串，runloop的模式台颠，使得runloop顯得更加靈活域醇，適應(yīng)更多的應(yīng)用場景。如果定時器處于mode1蓉媳，而runloop運(yùn)行在mode2，則定時器不會觸發(fā)锅铅，只有runloop運(yùn)行在mode1時酪呻，定時器才會觸發(fā)。

系統(tǒng)為我們提供了多種模式,下面列一些比較常遇到的：

kCFRunLoopDefaultMode: App的默認(rèn) Mode盐须，通常主線程是在這個 Mode 下運(yùn)行的玩荠。
UITrackingRunLoopMode: 界面跟蹤 Mode，用于 ScrollView 追蹤觸摸滑動，保證界面滑動時不受其他 Mode 影響阶冈。
UIInitializationRunLoopMode: 在剛啟動 App 時第進(jìn)入的第一個 Mode闷尿，啟動完成后就不再使用。
NSRunLoopCommonModes: 包含了多種模式：default, modal, 和tracking modes女坑。

這里只是簡單的說了下這幾個模式填具，后續(xù)會和大家詳述。

下面看一下代碼

- (void)demoCurrentMode
{
    NSLog(@"currentRunLoop1 = %@", [NSRunLoop currentRunLoop].currentMode);
    
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        NSLog(@"currentRunLoop2 = %@", [NSRunLoop currentRunLoop].currentMode);
    });
}

下面看輸出結(jié)果

2017-08-23 00:11:54.867 JJOC[4198:127223] currentRunLoop1 = UIInitializationRunLoopMode
2017-08-23 00:11:54.867 JJOC[4198:127355] currentRunLoop2 = (null)

這里還需要注意：

當(dāng)前輸入模式匆骗，該方法僅在接收器運(yùn)行時返回當(dāng)前輸入模式; 否則返回零劳景。
當(dāng)前模式由運(yùn)行循環(huán)的方法設(shè)置，如acceptInputForMode：beforeDate：和runMode：beforeDate :碉就。

結(jié)論：這個模式還是需要好好的理解的盟广，很重要。

三瓮钥、- (NSDate *)limitDateForMode:(NSRunLoopMode)mode;

該方法的作用是：在指定的模式下執(zhí)行一次通過運(yùn)行循環(huán)筋量，并返回下一個定時器計劃啟動的日期。也可以這么理解為下一次的運(yùn)行時間碉熄，如果在指定的mode上沒有inputSource則輸出nil桨武。其實(shí)就是獲取下一個響應(yīng)時間。

定時器的執(zhí)行具被，其實(shí)并不是按照時間段額間隔進(jìn)行調(diào)用方法玻募，而是在定時器注冊到RunLoop中后，RunLoop會設(shè)置一個一個的時間點(diǎn)進(jìn)行調(diào)用一姿，例如七咧，5,10,15,20等等。如果錯過了某個時間點(diǎn)叮叹，定時器并不會延遲調(diào)用艾栋，而是直接等待下一個時間點(diǎn)調(diào)用，所以定時器并不是準(zhǔn)確的蛉顽。

下面我們看一下參數(shù)和返回值蝗砾。

mode：運(yùn)行循環(huán)模式進(jìn)行搜索。您可以指定自定義模式或使用運(yùn)行循環(huán)模式Run Loop Modes中列出的其中一種模式携冤。
return ：下一個計時器的啟動日期悼粮，如果沒有此模式的輸入源，則為零曾棕。

這里還需要注意：

運(yùn)行循環(huán)以立即超時輸入扣猫，因此如果沒有輸入源需要處理，運(yùn)行循環(huán)不會阻塞翘地，等待輸入申尤。

結(jié)論：這個我也基本不會用到癌幕。

四、@property(class, readonly, strong) NSRunLoop *mainRunLoop;

這個屬性的作用就是獲取主線程的runloop對象昧穿，還是很好理解的勺远，下面我們看代碼。

- (void)demoMainRunLoop
{
    NSLog(@"mainRunLoop === %@", [NSRunLoop mainRunLoop]);
}

大家看一下輸出結(jié)果

017-08-23 11:35:43.202149+0800 JJOC[10999:5290377] mainRunLoop === <CFRunLoop 0x17416c780 [0x1aa03fbb8]>{wakeup port = 0x2103, stopped = false, ignoreWakeUps = true, 
current mode = UIInitializationRunLoopMode,
common modes = <CFBasicHash 0x1740460f0 [0x1aa03fbb8]>{type = mutable set, count = 2,
entries =>
    0 : <CFString 0x1a48f4970 [0x1aa03fbb8]>{contents = "UITrackingRunLoopMode"}
    2 : <CFString 0x1a3e3c4b0 [0x1aa03fbb8]>{contents = "kCFRunLoopDefaultMode"}
}
,
common mode items = <CFBasicHash 0x174046270 [0x1aa03fbb8]>{type = mutable set, count = 16,
entries =>
    0 : <CFRunLoopSource 0x17016cf00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopObserver 0x17013e8c0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x139d00dc0>}
    2 : <CFRunLoopObserver 0x17013e820 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x139d00dc0>}
    3 : <CFRunLoopObserver 0x17013e780 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}
    4 : <CFRunLoopSource 0x17416ccc0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    5 : <CFRunLoopSource 0x17016d800 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x17013ea00, callout = <redacted> (0x18a6a9614)}}
    6 : <CFRunLoopObserver 0x17013e5a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}
    7 : <CFRunLoopSource 0x17416c840 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x174146300 [0x1aa03fbb8]>{valid = Yes, port = 2003, source = 0x17416c840, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    8 : <CFRunLoopSource 0x17416d080 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17407b4c0, callout = <redacted> (0x18592ef34)}}
    9 : <CFRunLoopSource 0x17016d680 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x170047860, callout = <redacted> (0x18a6aaa58)}}
    10 : <CFRunLoopObserver 0x17013e500 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}
    11 : <CFRunLoopSource 0x17416e400 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17403cee0}}
    12 : <CFRunLoopSource 0x17016e7c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26887, subsystem = 0x1a415ff90, context = 0x1700ac240}}
    15 : <CFRunLoopSource 0x17016d8c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    19 : <CFRunLoopObserver 0x17013ebe0 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700d9280>}
    22 : <CFRunLoopSource 0x17416c9c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x1741463b0 [0x1aa03fbb8]>{valid = Yes, port = 2503, source = 0x17416c9c0, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
}
,
modes = <CFBasicHash 0x1740461e0 [0x1aa03fbb8]>{type = mutable set, count = 5,
entries =>
    2 : <CFRunLoopMode 0x174183dc0 [0x1aa03fbb8]>{name = UITrackingRunLoopMode, port set = 0x2703, queue = 0x17416ca80, source = 0x1741dd4c0 (not fired), timer port = 0x2903, 
    sources0 = <CFBasicHash 0x174046b10 [0x1aa03fbb8]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x17016cf00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopSource 0x17016d680 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x170047860, callout = <redacted> (0x18a6aaa58)}}
    3 : <CFRunLoopSource 0x17416d080 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17407b4c0, callout = <redacted> (0x18592ef34)}}
    5 : <CFRunLoopSource 0x17016d800 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x17013ea00, callout = <redacted> (0x18a6a9614)}}
}
,
    sources1 = <CFBasicHash 0x174046ae0 [0x1aa03fbb8]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x17016d8c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    1 : <CFRunLoopSource 0x17016e7c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26887, subsystem = 0x1a415ff90, context = 0x1700ac240}}
    2 : <CFRunLoopSource 0x17416ccc0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    4 : <CFRunLoopSource 0x17416c9c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x1741463b0 [0x1aa03fbb8]>{valid = Yes, port = 2503, source = 0x17416c9c0, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
    5 : <CFRunLoopSource 0x17416c840 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x174146300 [0x1aa03fbb8]>{valid = Yes, port = 2003, source = 0x17416c840, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    6 : <CFRunLoopSource 0x17416e400 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17403cee0}}
}
,
    observers = (
    "<CFRunLoopObserver 0x17013e780 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x17013ebe0 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700d9280>}",
    "<CFRunLoopObserver 0x17013e8c0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x139d00dc0>}",
    "<CFRunLoopObserver 0x17013e500 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x17013e820 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x139d00dc0>}",
    "<CFRunLoopObserver 0x17013e5a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = (null),
    currently 525152143 (35300544762839) / soft deadline in: 7.68612866e+11 sec (@ -1) / hard deadline in: 7.68612866e+11 sec (@ -1)
},

    3 : <CFRunLoopMode 0x170183c20 [0x1aa03fbb8]>{name = GSEventReceiveRunLoopMode, port set = 0x2e0b, queue = 0x17016cfc0, source = 0x1701dce30 (not fired), timer port = 0x3003, 
    sources0 = <CFBasicHash 0x1700476e0 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    0 : <CFRunLoopSource 0x17016cf00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
}
,
    sources1 = <CFBasicHash 0x1700476b0 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    0 : <CFRunLoopSource 0x17416cd80 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
}
,
    observers = (null),
    timers = (null),
    currently 525152143 (35300544795114) / soft deadline in: 7.68612866e+11 sec (@ -1) / hard deadline in: 7.68612866e+11 sec (@ -1)
},

    4 : <CFRunLoopMode 0x174183cf0 [0x1aa03fbb8]>{name = kCFRunLoopDefaultMode, port set = 0x2203, queue = 0x17416c900, source = 0x1741dd1f0 (not fired), timer port = 0x2403, 
    sources0 = <CFBasicHash 0x174045d90 [0x1aa03fbb8]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x17016cf00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopSource 0x17016d680 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x170047860, callout = <redacted> (0x18a6aaa58)}}
    3 : <CFRunLoopSource 0x17416d080 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17407b4c0, callout = <redacted> (0x18592ef34)}}
    5 : <CFRunLoopSource 0x17016d800 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x17013ea00, callout = <redacted> (0x18a6a9614)}}
}
,
    sources1 = <CFBasicHash 0x1740460c0 [0x1aa03fbb8]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x17016d8c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    1 : <CFRunLoopSource 0x17016e7c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26887, subsystem = 0x1a415ff90, context = 0x1700ac240}}
    2 : <CFRunLoopSource 0x17416ccc0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    4 : <CFRunLoopSource 0x17416c9c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x1741463b0 [0x1aa03fbb8]>{valid = Yes, port = 2503, source = 0x17416c9c0, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
    5 : <CFRunLoopSource 0x17416c840 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x174146300 [0x1aa03fbb8]>{valid = Yes, port = 2003, source = 0x17416c840, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    6 : <CFRunLoopSource 0x17416e400 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17403cee0}}
}
,
    observers = (
    "<CFRunLoopObserver 0x17013e780 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x17013ebe0 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700d9280>}",
    "<CFRunLoopObserver 0x17013e8c0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x139d00dc0>}",
    "<CFRunLoopObserver 0x17013e500 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x17013e820 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x139d00dc0>}",
    "<CFRunLoopObserver 0x17013e5a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x17005c1d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = <CFArray 0x1740abe20 [0x1aa03fbb8]>{type = mutable-small, count = 1, values = (
    0 : <CFRunLoopTimer 0x17416d800 [0x1aa03fbb8]>{valid = Yes, firing = No, interval = 0, tolerance = 0, next fire date = 525152145 (1.37681502 @ 35300577893733), callout = (Delayed Perform) UIApplication _accessibilitySetUpQuickSpeak (0x184863a64 / 0x189f3ac2c) (/System/Library/Frameworks/UIKit.framework/UIKit), context = <CFRunLoopTimer context 0x17407ad80>}
)},
    currently 525152143 (35300544796303) / soft deadline in: 1.37905954 sec (@ 35300577893733) / hard deadline in: 1.3790595 sec (@ 35300577893733)
},

    5 : <CFRunLoopMode 0x174183f60 [0x1aa03fbb8]>{name = UIInitializationRunLoopMode, port set = 0x3d03, queue = 0x17416d140, source = 0x1741dd790 (not fired), timer port = 0x3f03, 
    sources0 = <CFBasicHash 0x174047650 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    1 : <CFRunLoopSource 0x17416d080 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17407b4c0, callout = <redacted> (0x18592ef34)}}
}
,
    sources1 = <CFBasicHash 0x174047680 [0x1aa03fbb8]>{type = mutable set, count = 0,
entries =>
}
,
    observers = (
    "<CFRunLoopObserver 0x17013e500 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}"
),
    timers = (null),
    currently 525152143 (35300544850972) / soft deadline in: 7.68612866e+11 sec (@ -1) / hard deadline in: 7.68612866e+11 sec (@ -1)
},

    6 : <CFRunLoopMode 0x174184920 [0x1aa03fbb8]>{name = kCFRunLoopCommonModes, port set = 0x560f, queue = 0x17416dec0, source = 0x1741dda60 (not fired), timer port = 0x5903, 
    sources0 = (null),
    sources1 = (null),
    observers = (null),
    timers = (null),
    currently 525152143 (35300544853174) / soft deadline in: 7.68612866e+11 sec (@ -1) / hard deadline in: 7.68612866e+11 sec (@ -1)
},

}
}

結(jié)論：簡單易用，但是可以不用深究。

五牲览、- (CFRunLoopRef)getCFRunLoop;

該方法的作用就是返回底層的CFRunLoop對象。

這里還要注意：你可以使用返回的runloop來通過使用Core Foundation函數(shù)調(diào)用配置當(dāng)前的運(yùn)行循環(huán)宪塔。例如，您可以使用此功能設(shè)置運(yùn)行循環(huán)觀察器囊拜。

下面我們看代碼某筐。

- (void)demoGetCFRunLoop
{
    CFRunLoopRef *loopRef1 = [[NSRunLoop currentRunLoop] getCFRunLoop];
    NSLog(@"loopRef1 = %@", loopRef1);
    
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        CFRunLoopRef *loopRef2 = [[NSRunLoop currentRunLoop] getCFRunLoop];
        NSLog(@"loopRef2 = %@", loopRef2);
    });
}

下面看輸出結(jié)果

loopRef1

2017-08-23 11:48:32.070252+0800 JJOC[11006:5293944] loopRef1 = <CFRunLoop 0x170166b40 [0x1aa03fbb8]>{wakeup port = 0x2203, stopped = false, ignoreWakeUps = true, 
current mode = UIInitializationRunLoopMode,
common modes = <CFBasicHash 0x17004ae30 [0x1aa03fbb8]>{type = mutable set, count = 2,
entries =>
    0 : <CFString 0x1a48f4970 [0x1aa03fbb8]>{contents = "UITrackingRunLoopMode"}
    2 : <CFString 0x1a3e3c4b0 [0x1aa03fbb8]>{contents = "kCFRunLoopDefaultMode"}
}
,
common mode items = <CFBasicHash 0x17004ab00 [0x1aa03fbb8]>{type = mutable set, count = 16,
entries =>
    0 : <CFRunLoopSource 0x170167080 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopSource 0x1701684c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x17004c0c0, callout = <redacted> (0x18a6aaa58)}}
    2 : <CFRunLoopSource 0x170166d80 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158f70 [0x1aa03fbb8]>{valid = Yes, port = 2603, source = 0x170166d80, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
    3 : <CFRunLoopSource 0x1741669c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17406c800, callout = <redacted> (0x18592ef34)}}
    4 : <CFRunLoopSource 0x1701675c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    5 : <CFRunLoopObserver 0x170137520 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}
    6 : <CFRunLoopObserver 0x1701373e0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}
    7 : <CFRunLoopSource 0x1741678c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17002ad80}}
    10 : <CFRunLoopSource 0x170166c00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158ec0 [0x1aa03fbb8]>{valid = Yes, port = 2103, source = 0x170166c00, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    15 : <CFRunLoopSource 0x170168280 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    17 : <CFRunLoopSource 0x170168340 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x170137a20, callout = <redacted> (0x18a6a9614)}}
    18 : <CFRunLoopObserver 0x170137980 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700cdeb0>}
    19 : <CFRunLoopSource 0x174168100 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26883, subsystem = 0x1a415ff90, context = 0x1700b4a00}}
    20 : <CFRunLoopObserver 0x170137840 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x100602130>}
    21 : <CFRunLoopObserver 0x1701377a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x100602130>}
    22 : <CFRunLoopObserver 0x170137700 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}
}
,
modes = <CFBasicHash 0x17004ad40 [0x1aa03fbb8]>{type = mutable set, count = 5,
entries =>
    2 : <CFRunLoopMode 0x174181110 [0x1aa03fbb8]>{name = UITrackingRunLoopMode, port set = 0x2903, queue = 0x174166900, source = 0x1741d2840 (not fired), timer port = 0x2b03, 
    sources0 = <CFBasicHash 0x17404b1c0 [0x1aa03fbb8]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x170167080 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopSource 0x1741669c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17406c800, callout = <redacted> (0x18592ef34)}}
    2 : <CFRunLoopSource 0x170168340 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x170137a20, callout = <redacted> (0x18a6a9614)}}
    6 : <CFRunLoopSource 0x1701684c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x17004c0c0, callout = <redacted> (0x18a6aaa58)}}
}
,
    sources1 = <CFBasicHash 0x17404b190 [0x1aa03fbb8]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x170168280 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    1 : <CFRunLoopSource 0x170166d80 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158f70 [0x1aa03fbb8]>{valid = Yes, port = 2603, source = 0x170166d80, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
    2 : <CFRunLoopSource 0x170166c00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158ec0 [0x1aa03fbb8]>{valid = Yes, port = 2103, source = 0x170166c00, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    3 : <CFRunLoopSource 0x1701675c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    4 : <CFRunLoopSource 0x1741678c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17002ad80}}
    5 : <CFRunLoopSource 0x174168100 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26883, subsystem = 0x1a415ff90, context = 0x1700b4a00}}
}
,
    observers = (
    "<CFRunLoopObserver 0x170137700 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x170137980 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700cdeb0>}",
    "<CFRunLoopObserver 0x170137840 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x100602130>}",
    "<CFRunLoopObserver 0x1701373e0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x1701377a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x100602130>}",
    "<CFRunLoopObserver 0x170137520 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = (null),
    currently 525152912 (35318997621563) / soft deadline in: 7.68612865e+11 sec (@ -1) / hard deadline in: 7.68612865e+11 sec (@ -1)
},

    3 : <CFRunLoopMode 0x170181040 [0x1aa03fbb8]>{name = GSEventReceiveRunLoopMode, port set = 0x2e0b, queue = 0x170167140, source = 0x1701d2c00 (not fired), timer port = 0x3003, 
    sources0 = <CFBasicHash 0x17004bfa0 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    0 : <CFRunLoopSource 0x170167080 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
}
,
    sources1 = <CFBasicHash 0x17004beb0 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    0 : <CFRunLoopSource 0x170167500 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
}
,
    observers = (null),
    timers = (null),
    currently 525152912 (35318997655243) / soft deadline in: 7.68612865e+11 sec (@ -1) / hard deadline in: 7.68612865e+11 sec (@ -1)
},

    4 : <CFRunLoopMode 0x170180f70 [0x1aa03fbb8]>{name = kCFRunLoopDefaultMode, port set = 0x2303, queue = 0x170166cc0, source = 0x1701d2930 (not fired), timer port = 0x2503, 
    sources0 = <CFBasicHash 0x17004b190 [0x1aa03fbb8]>{type = mutable set, count = 4,
entries =>
    0 : <CFRunLoopSource 0x170167080 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x0, callout = <redacted> (0x1856cab5c)}}
    1 : <CFRunLoopSource 0x1741669c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17406c800, callout = <redacted> (0x18592ef34)}}
    2 : <CFRunLoopSource 0x170168340 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 0, info = 0x170137a20, callout = <redacted> (0x18a6a9614)}}
    6 : <CFRunLoopSource 0x1701684c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = -2, context = <CFRunLoopSource context>{version = 0, info = 0x17004c0c0, callout = <redacted> (0x18a6aaa58)}}
}
,
    sources1 = <CFBasicHash 0x17004ace0 [0x1aa03fbb8]>{type = mutable set, count = 6,
entries =>
    0 : <CFRunLoopSource 0x170168280 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 17955, subsystem = 0x1a48baba0, context = 0x0}}
    1 : <CFRunLoopSource 0x170166d80 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158f70 [0x1aa03fbb8]>{valid = Yes, port = 2603, source = 0x170166d80, callout = <redacted> (0x186f98fec), context = <CFMachPort context 0x0>}}
    2 : <CFRunLoopSource 0x170166c00 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFMachPort 0x170158ec0 [0x1aa03fbb8]>{valid = Yes, port = 2103, source = 0x170166c00, callout = <redacted> (0x186f98ee0), context = <CFMachPort context 0x0>}}
    3 : <CFRunLoopSource 0x1701675c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = -1, context = <CFRunLoopSource context>{version = 1, info = 0x3603, callout = <redacted> (0x1856cd370)}}
    4 : <CFRunLoopSource 0x1741678c0 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 25351, subsystem = 0x1a48d1600, context = 0x17002ad80}}
    5 : <CFRunLoopSource 0x174168100 [0x1aa03fbb8]>{signalled = No, valid = Yes, order = 0, context = <CFRunLoopSource MIG Server> {port = 26883, subsystem = 0x1a415ff90, context = 0x1700b4a00}}
}
,
    observers = (
    "<CFRunLoopObserver 0x170137700 [0x1aa03fbb8]>{valid = Yes, activities = 0x1, repeats = Yes, order = -2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}",
    "<CFRunLoopObserver 0x170137980 [0x1aa03fbb8]>{valid = Yes, activities = 0x20, repeats = Yes, order = 0, callout = <redacted> (0x189ea8698), context = <CFRunLoopObserver context 0x1700cdeb0>}",
    "<CFRunLoopObserver 0x170137840 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 1999000, callout = <redacted> (0x18a156150), context = <CFRunLoopObserver context 0x100602130>}",
    "<CFRunLoopObserver 0x1701373e0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}",
    "<CFRunLoopObserver 0x1701377a0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2001000, callout = <redacted> (0x189ea86a0), context = <CFRunLoopObserver context 0x100602130>}",
    "<CFRunLoopObserver 0x170137520 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2147483647, callout = <redacted> (0x189ea8824), context = <CFArray 0x1702405d0 [0x1aa03fbb8]>{type = mutable-small, count = 0, values = ()}}"
),
    timers = <CFArray 0x1740b4760 [0x1aa03fbb8]>{type = mutable-small, count = 1, values = (
    0 : <CFRunLoopTimer 0x174167440 [0x1aa03fbb8]>{valid = Yes, firing = No, interval = 0, tolerance = 0, next fire date = 525152913 (1.37859005 @ 35319030797578), callout = (Delayed Perform) UIApplication _accessibilitySetUpQuickSpeak (0x184863a64 / 0x189f3ac2c) (/System/Library/Frameworks/UIKit.framework/UIKit), context = <CFRunLoopTimer context 0x17406cbc0>}
)},
    currently 525152912 (35318997656551) / soft deadline in: 1.38087608 sec (@ 35319030797578) / hard deadline in: 1.38087604 sec (@ 35319030797578)
},

    5 : <CFRunLoopMode 0x174181380 [0x1aa03fbb8]>{name = UIInitializationRunLoopMode, port set = 0x3c03, queue = 0x174166d80, source = 0x1741d2b10 (not fired), timer port = 0x3e03, 
    sources0 = <CFBasicHash 0x17404ba00 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    2 : <CFRunLoopSource 0x1741669c0 [0x1aa03fbb8]>{signalled = Yes, valid = Yes, order = 0, context = <CFRunLoopSource context>{version = 0, info = 0x17406c800, callout = <redacted> (0x18592ef34)}}
}
,
    sources1 = <CFBasicHash 0x17404ba30 [0x1aa03fbb8]>{type = mutable set, count = 0,
entries =>
}
,
    observers = (
    "<CFRunLoopObserver 0x1701373e0 [0x1aa03fbb8]>{valid = Yes, activities = 0xa0, repeats = Yes, order = 2000000, callout = <redacted> (0x18703ae14), context = <CFRunLoopObserver context 0x0>}"
),
    timers = (null),
    currently 525152912 (35318997712510) / soft deadline in: 7.68612865e+11 sec (@ -1) / hard deadline in: 7.68612865e+11 sec (@ -1)
},

    6 : <CFRunLoopMode 0x1701827d0 [0x1aa03fbb8]>{name = kCFRunLoopCommonModes, port set = 0x5807, queue = 0x170168640, source = 0x1701d31a0 (not fired), timer port = 0x5903, 
    sources0 = (null),
    sources1 = (null),
    observers = (null),
    timers = (null),
    currently 525152912 (35318997714832) / soft deadline in: 7.68612865e+11 sec (@ -1) / hard deadline in: 7.68612865e+11 sec (@ -1)
},

}
}

loopRef2

2017-08-23 11:48:32.078486+0800 JJOC[11006:5293985] loopRef2 = <CFRunLoop 0x174167200 [0x1aa03fbb8]>{wakeup port = 0x4d0f, stopped = false, ignoreWakeUps = true, 
current mode = (none),
common modes = <CFBasicHash 0x17404bee0 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    2 : <CFString 0x1a3e3c4b0 [0x1aa03fbb8]>{contents = "kCFRunLoopDefaultMode"}
}
,
common mode items = (null),
modes = <CFBasicHash 0x17404bc70 [0x1aa03fbb8]>{type = mutable set, count = 1,
entries =>
    2 : <CFRunLoopMode 0x1741815f0 [0x1aa03fbb8]>{name = kCFRunLoopDefaultMode, port set = 0x560f, queue = 0x174167500, source = 0x1741d3650 (not fired), timer port = 0x520b, 
    sources0 = (null),
    sources1 = (null),
    observers = (null),
    timers = (null),
    currently 525152912 (35318997914397) / soft deadline in: 7.68612865e+11 sec (@ -1) / hard deadline in: 7.68612865e+11 sec (@ -1)
},

}
}

結(jié)論：如果沒有特殊的需求，一般也用不到這個底層冠跷，但是研究下還是好的南誊。

參考文章

1. NSRunloop一點(diǎn)理解
 2. iOS開發(fā)RunLoop學(xué)習(xí)：一：RunLoop簡單介紹

后記

未完，待續(xù)~~~

秋

最后編輯于：2017.12.10 03:17:43

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