--------轉(zhuǎn)載-------

1、禁止手機(jī)睡眠

[UIApplication sharedApplication].idleTimerDisabled = YES;

2、隱藏某行cell

• (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
  {
  // 如果是你需要隱藏的那一行关划，返回高度為0
  if(indexPath.row == YouWantToHideRow)
  return 0;
  return 44;
  }

// 然后再你需要隱藏cell的時(shí)候調(diào)用
[self.tableView beginUpdates];
[self.tableView endUpdates];

3凑保、禁用button高亮

button.adjustsImageWhenHighlighted = NO;
或者在創(chuàng)建的時(shí)候
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

4朱嘴、tableview遇到這種報(bào)錯(cuò)failed to obtain a cell from its dataSource

是因?yàn)槟愕腸ell被調(diào)用的早了须尚。先循環(huán)使用了cell动分，后又創(chuàng)建cell振愿。順序錯(cuò)了
可能原因：1捷犹、xib的cell沒(méi)有注冊(cè) 2弛饭、內(nèi)存中已經(jīng)有這個(gè)cell的緩存了(也就是說(shuō)通過(guò)你的cellId找到的cell并不是你想要的類型)，這時(shí)候需要改下cell的標(biāo)識(shí)

5萍歉、cocoa pods報(bào)這個(gè)錯(cuò)誤：unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received

解決辦法：原因可能是網(wǎng)絡(luò)問(wèn)題侣颂，網(wǎng)絡(luò)請(qǐng)求超時(shí)了，只需要重試就行了

6枪孩、cocoa pods 出現(xiàn)ERROR: While executing gem ... (Errno::EPERM)

解決辦法：
https://segmentfault.com/q/1010000002926243

7憔晒、動(dòng)畫(huà)切換window的根控制器

// options是動(dòng)畫(huà)選項(xiàng)
[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
BOOL oldState = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];
[UIView setAnimationsEnabled:oldState];
} completion:^(BOOL finished) {

}];

8、去除數(shù)組中重復(fù)的對(duì)象

NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

9蔑舞、編譯的時(shí)候遇到 no such file or directory: ／users／apple／XXX

是因?yàn)榫幾g的時(shí)候拒担，在此路徑下找不到這個(gè)文件，解決這個(gè)問(wèn)題攻询，首先是是要檢查缺少的文件是不是在工程中澎蛛，如果不在工程中，需要從本地拖進(jìn)去蜕窿，如果發(fā)現(xiàn)已經(jīng)存在工程中了谋逻，或者拖進(jìn)去還是報(bào)錯(cuò)，這時(shí)候需要去build phases中搜索這個(gè)文件桐经，這時(shí)候很可能會(huì)搜出現(xiàn)兩個(gè)相同的文件毁兆，這時(shí)候，有一個(gè)路徑是正確的阴挣，刪除另外一個(gè)即可气堕。如果刪除了還是不行，需要把兩個(gè)都刪掉畔咧，然后重新往工程里拖進(jìn)這個(gè)文件即可

build phases

10茎芭、iOS8系統(tǒng)中，tableView最好實(shí)現(xiàn)下-tableView: heightForRowAtIndexPath:這個(gè)代理方法誓沸，要不然在iOS8中可能就會(huì)出現(xiàn)顯示不全或者無(wú)法響應(yīng)事件的問(wèn)題

11梅桩、iOS8中實(shí)現(xiàn)側(cè)滑功能的時(shí)候這個(gè)方法必須實(shí)現(xiàn)，要不然在iOS8中無(wú)法側(cè)滑

// 必須寫(xiě)的方法拜隧，和editActionsForRowAtIndexPath配對(duì)使用宿百，里面什么不寫(xiě)也行

• (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

}

12、三個(gè)通知

NSSystemTimeZoneDidChangeNotification監(jiān)聽(tīng)修改時(shí)間界面的兩個(gè)按鈕狀態(tài)變化
UIApplicationSignificantTimeChangeNotification 監(jiān)聽(tīng)用戶改變時(shí)間 （只要點(diǎn)擊自動(dòng)設(shè)置按鈕就會(huì)調(diào)用） NSSystemClockDidChangeNotification 監(jiān)聽(tīng)用戶修改時(shí)間（時(shí)間不同才會(huì)調(diào)用）

13洪添、SDWebImage本地緩存有時(shí)候會(huì)害人垦页。如果之前緩存過(guò)一張圖片，即使下次服務(wù)器換了這張圖片干奢，但是圖片url沒(méi)換痊焊，用sdwebimage下載下來(lái)的還是以前那張,所以遇到這種問(wèn)題，不要先去懟服務(wù)器，清空下緩存再試就好了薄啥。

14貌矿、上線前注意：

1）、刪掉代碼中所有的測(cè)試代碼
2）罪佳、如果后臺(tái)有審核模式逛漫，提醒后臺(tái)開(kāi)啟此模式
3）、主流程再跑一跑
4）赘艳、全局搜索waring酌毡，檢查所有標(biāo)記waring的地方

15、跳進(jìn)app權(quán)限設(shè)置

// 跳進(jìn)app設(shè)置
if (UIApplicationOpenSettingsURLString != NULL) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url];
}
}

16蕾管、給一個(gè)view截圖

UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

17枷踏、開(kāi)發(fā)中如果要?jiǎng)討B(tài)修改tableView的tableHeaderView或者tableFooterView的高度，需要給tableView重新設(shè)置掰曾，而不是直接更改高度旭蠕。正確的做法是重新設(shè)置一下tableView.tableFooterView = 更改過(guò)高度的view。為什么旷坦？其實(shí)在iOS8以上直接改高度是沒(méi)有問(wèn)題的掏熬，在iOS8中出現(xiàn)了contentSize不準(zhǔn)確的問(wèn)題，這是解決辦法秒梅。

18旗芬、注意對(duì)象為nil的時(shí)候，調(diào)用此對(duì)象分類的方法不會(huì)執(zhí)行

19捆蜀、collectionView的內(nèi)容小于其寬高的時(shí)候是不能滾動(dòng)的疮丛，設(shè)置可以滾動(dòng)：

collectionView.alwaysBounceHorizontal = YES;
collectionView.alwaysBounceVertical = YES;

20、設(shè)置navigationBar上的title顏色和大小

[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]

21辆它、顏色轉(zhuǎn)圖片

• (UIImage *)cl_imageWithColor:(UIColor *)color {
  CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
  UIGraphicsBeginImageContext(rect.size);
  CGContextRef context = UIGraphicsGetCurrentContext();

  CGContextSetFillColorWithColor(context, [color CGColor]);
  CGContextFillRect(context, rect);

  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();

  return image;
  }

22誊薄、view設(shè)置圓角

define ViewBorderRadius(View, Radius, Width, Color)\

[View.layer setCornerRadius:(Radius)];
[View.layer setMasksToBounds:YES];
[View.layer setBorderWidth:(Width)];
[View.layer setBorderColor:[Color CGColor]] // view圓角

23、強(qiáng)／弱引用

define WeakSelf(type) __weak typeof(type) weak##type = type; // weak

define StrongSelf(type) __strong typeof(type) type = weak##type; // strong

24锰茉、由角度轉(zhuǎn)換弧度

define DegreesToRadian(x) (M_PI * (x) / 180.0)

25呢蔫、由弧度轉(zhuǎn)換角度

define RadianToDegrees(radian) (radian*180.0)/(M_PI)

26、獲取圖片資源

define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]

27洞辣、獲取temp

define PathTemp NSTemporaryDirectory()

28咐刨、獲取沙盒 Document

define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]

29昙衅、獲取沙盒 Cache

define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]

30扬霜、GCD代碼只執(zhí)行一次

define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);

31、自定義NSLog

ifdef DEBUG

define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), PRETTY_FUNCTION, LINE, ##VA_ARGS)

else

define NSLog(...)

endif

32而涉、Font

define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight]

define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular]

define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold]

define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin]

define Font(s) FontL(s)

33著瓶、FORMAT

define FORMAT(f, ...) [NSString stringWithFormat:f, ## VA_ARGS]

34、在主線程上運(yùn)行

define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);

35啼县、開(kāi)啟異步線程

define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);

36材原、通知

define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]

define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]

define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]

37沸久、隨機(jī)顏色

• (UIColor *)RandomColor {
  NSInteger aRedValue = arc4random() % 255;
  NSInteger aGreenValue = arc4random() % 255;
  NSInteger aBlueValue = arc4random() % 255;
  UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];
  return randColor;
  }

38、獲取window

+(UIWindow)getWindow {
UIWindow win = nil; //[UIApplication sharedApplication].keyWindow;
for (id item in [UIApplication sharedApplication].windows) {
if ([item class] == [UIWindow class]) {
if (!((UIWindow*)item).hidden) {
win = item;
break;
}
}
}
return win;
}

39余蟹、修改textField的placeholder的字體顏色卷胯、大小

[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
40、統(tǒng)一收起鍵盤(pán)

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

41威酒、控制屏幕旋轉(zhuǎn)窑睁，在控制器中寫(xiě)

/** 是否支持自動(dòng)轉(zhuǎn)屏 */

• (BOOL)shouldAutorotate {
  return YES;
  }

/** 支持哪些屏幕方向 */

• (UIInterfaceOrientationMask)supportedInterfaceOrientations {
  return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
  }

/** 默認(rèn)的屏幕方向（當(dāng)前ViewController必須是通過(guò)模態(tài)出來(lái)的UIViewController（模態(tài)帶導(dǎo)航的無(wú)效）方式展現(xiàn)出來(lái)的，才會(huì)調(diào)用這個(gè)方法） */

• (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
  return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;
  }

42葵孤、獲取app緩存大小

• (CGFloat)getCachSize {

  NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];
  //獲取自定義緩存大小
  //用枚舉器遍歷 一個(gè)文件夾的內(nèi)容
  //1.獲取 文件夾枚舉器
  NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
  NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];
  __block NSUInteger count = 0;
  //2.遍歷
  for (NSString *fileName in enumerator) {
  NSString *path = [myCachePath stringByAppendingPathComponent:fileName];
  NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
  count += fileDict.fileSize;//自定義所有緩存大小
  }
  // 得到是字節(jié) 轉(zhuǎn)化為M
  CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;
  return totalSize;
  }

43担钮、清理app緩存

• (void)handleClearView {
  //刪除兩部分
  //1.刪除 sd 圖片緩存
  //先清除內(nèi)存中的圖片緩存
  [[SDImageCache sharedImageCache] clearMemory];
  //清除磁盤(pán)的緩存
  [[SDImageCache sharedImageCache] clearDisk];
  //2.刪除自己緩存
  NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
  [[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];
  }

44、模型轉(zhuǎn)字典

static NSSet *classes;

• (NSMutableDictionary *)getParameterDictionary {

  NSMutableDictionary *dict = [NSMutableDictionary dictionary];

  Class c = self.class;

  while (c) {
  unsigned count;
  objc_property_t *properties = class_copyPropertyList([c class], &count);

    for (int i = 0; i < count; i++) {
        NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];
        dict[key] = [self valueForKey:key];
    }
    free(properties);
  
    // 獲得父類
    c = class_getSuperclass(c);
  
    if ([self isClassFromFoundation:c]) break;
  

  }
  return dict;
  }

• (BOOL)isClassFromFoundation:(Class)c
  {
  if (c == [NSObject class] || c == [NSManagedObject class]) return YES;

  __block BOOL result = NO;
  [[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {
  if ([c isSubclassOfClass:foundationClass]) {
  result = YES;
  *stop = YES;
  }
  }];
  return result;
  }

• (NSSet *)foundationClasses
  {
  if (classes == nil) {
  // 集合中沒(méi)有NSObject尤仍，因?yàn)閹缀跛械念惗际抢^承自NSObject箫津，具體是不是NSObject需要特殊判斷
  classes = [NSSet setWithObjects:
  [NSURL class],
  [NSDate class],
  [NSValue class],
  [NSData class],
  [NSError class],
  [NSArray class],
  [NSDictionary class],
  [NSString class],
  [NSAttributedString class], nil];
  }
  return classes;
  }

45、交換兩個(gè)方法實(shí)現(xiàn)

Class aClass = [self class];

    SEL originalSelector = @selector(viewWillAppear:); 
    SEL swizzledSelector = @selector(xxx_viewWillAppear:); 

    Method originalMethod = class_getInstanceMethod(aClass, originalSelector); 
    Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector); 

    BOOL didAddMethod = 
        class_addMethod(aClass, 
            originalSelector, 
            method_getImplementation(swizzledMethod), 
            method_getTypeEncoding(swizzledMethod)); 

    if (didAddMethod) { 
        class_replaceMethod(aClass, 
            swizzledSelector, 
            method_getImplementation(originalMethod), 
            method_getTypeEncoding(originalMethod)); 
    } else { 
        method_exchangeImplementations(originalMethod, swizzledMethod); 
    }

46宰啦、打印百分號(hào)和引號(hào)

NSLog(@"%%");
NSLog(@"\"");

47苏遥、幾個(gè)常用權(quán)限判斷

if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {
    NSLog(@"沒(méi)有定位權(quán)限");
}
AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (statusVideo == AVAuthorizationStatusDenied) {
    NSLog(@"沒(méi)有攝像頭權(quán)限");
}
//是否有麥克風(fēng)權(quán)限
AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
if (statusAudio == AVAuthorizationStatusDenied) {
    NSLog(@"沒(méi)有錄音權(quán)限");
}
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
    if (status == PHAuthorizationStatusDenied) {
        NSLog(@"沒(méi)有相冊(cè)權(quán)限");
    }
}];

48、獲取手機(jī)型號(hào)

+ (NSString *)getDeviceInfo {
struct utsname systemInfo;
uname(&systemInfo);
NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
// 日行兩款手機(jī)型號(hào)均為日本獨(dú)占赡模，可能使用索尼FeliCa支付方案而不是蘋(píng)果支付
if ([platform isEqualToString:@"iPhone9,1"])    return @"國(guó)行暖眼、日版、港行iPhone 7";
if ([platform isEqualToString:@"iPhone9,2"])    return @"港行纺裁、國(guó)行iPhone 7 Plus";
if ([platform isEqualToString:@"iPhone9,3"])    return @"美版诫肠、臺(tái)版iPhone 7";
if ([platform isEqualToString:@"iPhone9,4"])    return @"美版、臺(tái)版iPhone 7 Plus";
if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";
if ([platform isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";
if ([platform isEqualToString:@"iPod5,1"]) return @"iPod Touch 5G";
if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";
if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";
if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";
return platform;

}

49欺缘、長(zhǎng)按復(fù)制功能

• (void)viewDidLoad
  {
  [self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];
  }
• (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {
  if (longPress.state == UIGestureRecognizerStateBegan) {
  UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
  pasteboard.string = @"需要復(fù)制的文本";
  }
  }

50栋豫、cocoapods升級(jí)

在終端執(zhí)行 sudo gem install -n / usr / local / bin cocoapods --pre

51、設(shè)置啟動(dòng)頁(yè)后谚殊，依然顯示之前的

刪除app丧鸯，手機(jī)重啟，重新安裝

52嫩絮、判斷圖片類型

//通過(guò)圖片Data數(shù)據(jù)第一個(gè)字節(jié) 來(lái)獲取圖片擴(kuò)展名

• (NSString *)contentTypeForImageData:(NSData *)data
  {
  uint8_t c;
  [data getBytes:&c length:1];
  switch (c)
  {
  case 0xFF:
  return @"jpeg";

    case 0x89:
        return @"png";
  
    case 0x47:
        return @"gif";
  
    case 0x49:
    case 0x4D:
        return @"tiff";
  
    case 0x52:
    if ([data length] < 12) {
        return nil;
    }
  
    NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding];
    if ([testString hasPrefix:@"RIFF"]
        && [testString hasSuffix:@"WEBP"])
    {
        return @"webp";
    }
  
    return nil;
  

  }

  return nil;
  }

53丛肢、獲取手機(jī)和app信息

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
CFShow(infoDictionary);
// app名稱
NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
// app版本
NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
// app build版本
NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];

//手機(jī)序列號(hào)  
NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];  
NSLog(@"手機(jī)序列號(hào): %@",identifierNumber);  
//手機(jī)別名： 用戶定義的名稱  
NSString* userPhoneName = [[UIDevice currentDevice] name];  
NSLog(@"手機(jī)別名: %@", userPhoneName);  
//設(shè)備名稱  
NSString* deviceName = [[UIDevice currentDevice] systemName];  
NSLog(@"設(shè)備名稱: %@",deviceName );  
//手機(jī)系統(tǒng)版本  
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];  
NSLog(@"手機(jī)系統(tǒng)版本: %@", phoneVersion);  
//手機(jī)型號(hào)  
NSString* phoneModel = [[UIDevice currentDevice] model];  
NSLog(@"手機(jī)型號(hào): %@",phoneModel );  
//地方型號(hào)  （國(guó)際化區(qū)域名稱）  
NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];  
NSLog(@"國(guó)際化區(qū)域名稱: %@",localPhoneModel );  

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];  
// 當(dāng)前應(yīng)用名稱  
NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];  
NSLog(@"當(dāng)前應(yīng)用名稱：%@",appCurName);  
// 當(dāng)前應(yīng)用軟件版本  比如：1.0.1  
NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];  
NSLog(@"當(dāng)前應(yīng)用軟件版本:%@",appCurVersion);  
// 當(dāng)前應(yīng)用版本號(hào)碼   int類型  
NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];  
NSLog(@"當(dāng)前應(yīng)用版本號(hào)碼：%@",appCurVersionNum);

54、獲取一個(gè)類的所有屬性

id LenderClass = objc_getClass("Lender");
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);
for (i = 0; i < outCount; i++) {
objc_property_t property = properties[i];
fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property));
}

55剿干、image圓角

• (UIImage *)circleImage
  {
  // NO代表透明
  UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);
  // 獲得上下文
  CGContextRef ctx = UIGraphicsGetCurrentContext();
  // 添加一個(gè)圓
  CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
  // 方形變圓形
  CGContextAddEllipseInRect(ctx, rect);
  // 裁剪
  CGContextClip(ctx);
  // 將圖片畫(huà)上去
  [self drawInRect:rect];
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
  return image;
  }

56蜂怎、image拉伸

• (UIImage *)resizableImage:(NSString *)imageName
  {
  UIImage *image = [UIImage imageNamed:imageName];
  CGFloat imageW = image.size.width;
  CGFloat imageH = image.size.height;
  return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];
  }
  57、JSON字符串轉(zhuǎn)字典

• (NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {
  NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
  NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];
  return responseJSON;
  }

58置尔、身份證號(hào)驗(yàn)證

• (BOOL)validateIdentityCard {
  BOOL flag;
  if (self.length <= 0) {
  flag = NO;
  return flag;
  }
  NSString *regex2 = @"^(\d{14}|\d{17})(\d|[xX])$";
  NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
  return [identityCardPredicate evaluateWithObject:self];
  }

59杠步、獲取設(shè)備mac地址

• (NSString *)macAddress {
  int mib[6];
  size_t len;
  char *buf;
  unsigned char *ptr;
  struct if_msghdr *ifm;
  struct sockaddr_dl *sdl;

  mib[0] = CTL_NET;
  mib[1] = AF_ROUTE;
  mib[2] = 0;
  mib[3] = AF_LINK;
  mib[4] = NET_RT_IFLIST;

  if((mib[5] = if_nametoindex("en0")) == 0) {
  printf("Error: if_nametoindex error\n");
  return NULL;
  }

  if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
  printf("Error: sysctl, take 1\n");
  return NULL;
  }

  if((buf = malloc(len)) == NULL) {
  printf("Could not allocate memory. Rrror!\n");
  return NULL;
  }

  if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
  printf("Error: sysctl, take 2");
  return NULL;
  }

  ifm = (struct if_msghdr *)buf;
  sdl = (struct sockaddr_dl *)(ifm + 1);
  ptr = (unsigned char *)LLADDR(sdl);
  NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
  *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
  free(buf);

  return outstring;
  }

60、導(dǎo)入自定義字體庫(kù)

1、找到你想用的字體的 ttf 格式幽歼，拖入工程
2朵锣、在工程的plist中增加一行數(shù)組，“Fonts provided by application”
3甸私、為這個(gè)key添加一個(gè)item诚些，value為你剛才導(dǎo)入的ttf文件名
4、直接使用即可：label.font = [UIFont fontWithName:@"你剛才導(dǎo)入的ttf文件名" size:20.0]皇型；

61泣刹、拿到當(dāng)前正在顯示的控制器，不管是push進(jìn)去的犀被，還是present進(jìn)去的都能拿到

• (UIViewController )getVisibleViewControllerFrom:(UIViewController)vc {
  if ([vc isKindOfClass:[UINavigationController class]]) {
  return [self getVisibleViewControllerFrom:[((UINavigationController) vc) visibleViewController]];
  }else if ([vc isKindOfClass:[UITabBarController class]]){
  return [self getVisibleViewControllerFrom:[((UITabBarController) vc) selectedViewController]];
  } else {
  if (vc.presentedViewController) {
  return [self getVisibleViewControllerFrom:vc.presentedViewController];
  } else {
  return vc;
  }
  }
  }

62椅您、runtime為一個(gè)類動(dòng)態(tài)添加屬性

// 動(dòng)態(tài)添加屬性的本質(zhì)是: 讓對(duì)象的某個(gè)屬性與值產(chǎn)生關(guān)聯(lián)
objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

63、獲取runtime為一個(gè)類動(dòng)態(tài)添加的屬性

objc_getAssociatedObject(self, WZBPlaceholderViewKey);

64寡键、KVO監(jiān)聽(tīng)某個(gè)對(duì)象的屬性

// 添加監(jiān)聽(tīng)者
[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];

// 當(dāng)監(jiān)聽(tīng)的屬性值變化的時(shí)候會(huì)來(lái)到這個(gè)方法

• (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
  if ([keyPath isEqualToString:@"property"]) {
  [self textViewTextChange];
  } else {
  }
  }

65掀泳、Reachability判斷網(wǎng)絡(luò)狀態(tài)

NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];
if (status == NotReachable) {
NSLog(@"當(dāng)前設(shè)備無(wú)網(wǎng)絡(luò)");
}
if (status == ReachableViaWiFi) {
NSLog(@"當(dāng)前wifi網(wǎng)絡(luò)");
}
if (status == NotReachable) {
NSLog(@"當(dāng)前蜂窩移動(dòng)網(wǎng)絡(luò)");
}