推薦閱讀：iOS開(kāi)發(fā)——BAT面試題合集（持續(xù)更新中）
1、Multiple commands produce 'xxx/Info.plist'
2、 iOS 12 系統(tǒng) WiFi 獲取 SSID (wifi名稱)和 BSSID (mac地址)失敗
3、 Xcode 10 中 #import 的時(shí)候閃退或?qū)腩^文件不提示
4、[ Xcode 10 ] library not found for -lstdc++.6.0.9
5、[ iOS 12.1 ] 二級(jí)頁(yè)面返回時(shí) tabbar 圖標(biāo)和文字位置偏移
6、 webView 播放視頻返回后狀態(tài)欄消失
7狮鸭、[ iPhone X ] StatusBar 內(nèi)部結(jié)構(gòu)改變導(dǎo)致 crash
文章來(lái)自于我的簡(jiǎn)書(shū)：原文在這里
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1、Multiple commands produce 'xxx/Info.plist'
升級(jí)
Xcode 10之后多搀，編譯之前的項(xiàng)目歧蕉，發(fā)生編譯錯(cuò)誤：Multiple commands produce 'xxx/Info.plist'，項(xiàng)目中存在重復(fù)命名的info.plist文件康铭。解決方案：
（I）標(biāo)準(zhǔn)方案：刪除所有重復(fù)命名的文件惯退。
（II）臨時(shí)方案：
xcworkspace項(xiàng)目：Xcode菜單欄File->Workspace Settings->Build System->Legacy Build System；xcodeprj項(xiàng)目：Xcode菜單欄File->Project Settings->Build System->Legacy Build System从藤。 -
2催跪、
iOS 12系統(tǒng)WiFi獲取SSID(wifi名稱)和BSSID(mac地址)失敗在
iOS 12系統(tǒng)之后，蘋(píng)果提升了獲取WiFi名稱和mac地址的權(quán)限控制夷野，要獲取這些信息懊蒸，需要手動(dòng)為應(yīng)用打開(kāi)獲取WiFi信息的權(quán)限。具體操作可以參考《 獲取iOS設(shè)備WiFi名字和mac地址+iOS12系統(tǒng)獲取失敗解決 》悯搔。解決方案：
在開(kāi)發(fā)者賬號(hào)中骑丸，勾選項(xiàng)目的
App ID的Access WiFi Infomation選項(xiàng)；在Xcode的
Capabilities中妒貌，勾選項(xiàng)目的Access WiFi Infomation選項(xiàng)通危。 -
3、
Xcode 10中#import的時(shí)候閃退或?qū)腩^文件不提示在
Xcode 10中出現(xiàn)輸入#import引入文件/類庫(kù)頭文件的時(shí)候Xcode閃退灌曙【盏或者輸入#import導(dǎo)入頭文件時(shí)不提示。解決方案：
xcworkspace項(xiàng)目：Xcode菜單欄File->Workspace Settings->Build System->Legacy Build System平匈；xcodeprj項(xiàng)目：Xcode菜單欄File->Project Settings->Build System->Legacy Build System框沟。 -
4藏古、[
Xcode 10] library not found for -lstdc++.6.0.9蘋(píng)果在
Xcode 10和iOS 12中移除了libstdc++庫(kù)增炭，由libc++這個(gè)庫(kù)取而代之，蘋(píng)果的解釋是libstdc++已經(jīng)標(biāo)記為廢棄有5年了拧晕，建議大家使用經(jīng)過(guò)了llvm優(yōu)化過(guò)并且全面支持C++11的libc++庫(kù)隙姿。所以Xcode 10中l(wèi)ibstdc++相關(guān)的3個(gè)庫(kù)（libstdc++、libstdc++.6厂捞、libstdc++6.0.9）都已被移除输玷，不可再使用队丝。解決方案：
（I）調(diào)整代碼為依賴
libc++更改c++庫(kù)文件，
TARGETS->Build Phases->Link Binary With Libraries欲鹏，刪除stdc++.6.0.9依賴机久，添加libc++.tdb；TARGETS->Build Settings->Other Linker Flags赔嚎，刪除-l "stdc++.6.0.9"膘盖。修改代碼為依賴libc++。（II）從
Xcode 9中導(dǎo)入libstdc++到Xcode 10中尤误。找到
Xcode 9中的libstdc++庫(kù)文件copy到Xcode 10的lib文件夾下侠畔。參考路徑方法如下，分別是真機(jī)和模擬器的運(yùn)行庫(kù)文件導(dǎo)入：<pre class="prettyprint hljs awk" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/libstdc++.* /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/
cp /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/libstdc++.* /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/
復(fù)制代碼</pre> -
5损晤、[
iOS 12.1] 二級(jí)頁(yè)面返回時(shí)tabbar圖標(biāo)和文字位置偏移iOS 12.1系統(tǒng)中UINavigationController+UITabBarController软棺，UITabBar為磨砂，并且pushViewController的時(shí)候使用hidesBottomBarWhenPushed = YES尤勋，則在使用popViewController:animated返回喘落，或者手勢(shì)返回的時(shí)候，就會(huì)出現(xiàn)tabbar布局錯(cuò)亂最冰，圖標(biāo)和文字位置偏移的問(wèn)題揖盘。出現(xiàn)這個(gè)問(wèn)題的直接原因是UITabBar為磨砂的情況下，返回頁(yè)面時(shí)tabBar內(nèi)的按鈕UITabBarButton被設(shè)置了錯(cuò)誤的frame锌奴，frame.size變?yōu)榱?(0, 0) 兽狭。最簡(jiǎn)單的解決方案是：
<pre class="hljs json" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 0.75em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">[[UITabBar appearance].translucent = NO;
復(fù)制代碼</pre> -
6、
webView播放視頻返回后狀態(tài)欄消失視頻播放完成主
window成為KeyWindow的時(shí)候仍隱藏著UIStatusBar鹿蜀。解決方案：
<pre class="prettyprint hljs less" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">- (void)videoPlayerFinishedToShowStatusBar
{
if (@available(iOS 12.0, *)) {
[[NSNotificationCenter defaultCenter] addObserverForName:UIWindowDidBecomeKeyNotification
object:self.window
queue:[NSOperationQueue mainQueue]
usingBlock:^(NSNotification * _Nonnull note) {
[[UIApplication sharedApplication] setStatusBarHidden:NO
withAnimation:UIStatusBarAnimationNone];
}];
}
}
復(fù)制代碼</pre> -
7箕慧、[
iPhone X]StatusBar內(nèi)部結(jié)構(gòu)改變導(dǎo)致crash蘋(píng)果17年底推出全面屏劉海手機(jī)之后，應(yīng)用頂部
StatusBar內(nèi)部結(jié)構(gòu)發(fā)生改變茴恰，如果項(xiàng)目中使用狀態(tài)欄中圖標(biāo)獲取手機(jī)狀態(tài)信息（如：獲取當(dāng)前網(wǎng)絡(luò)的狀態(tài)）颠焦，則在iPhone X (Xs,Xs Max,XR)手機(jī)上會(huì)發(fā)生崩潰。注意：發(fā)生崩潰的機(jī)型是有劉海的手機(jī)
iPhone X (Xs,Xs Max,XR)往枣。 例如獲取當(dāng)前網(wǎng)絡(luò)狀態(tài)伐庭。<pre class="prettyprint hljs vbnet" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">crash log：
*** Terminating app due to uncaught exception 'NSUnknownKeyException',
reason: '[<UIStatusBar_Modern 0x7ffbf2c05670> valueForUndefinedKey:]:
this class is not key value coding-compliant for the key foregroundView.'
復(fù)制代碼</pre>導(dǎo)致上面崩潰的代碼如下：
<pre class="prettyprint hljs objectivec" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">- (NSString *)getiPhoneNetWorkStates
{
UIApplication *app = [UIApplication sharedApplication];
NSString *states = @"UnKnow";
NSArray *subViews = [[[app valueForKeyPath:@"statusBar"] valueForKeyPath:@"foregroundView"] subviews];
for (id child in subViews) {
if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
int networkType = [[child valueForKeyPath:@"dataNetworkType"] intValue];
NSString *networkStatus = @"UnKnow";
switch (networkType) {
case 0:
networkStatus = @"UnKnow";
break;
case 1:
networkStatus = @"2G";
break;
case 2:
networkStatus = @"3G";
break;
case 3:
networkStatus = @"4G";
break;
case 4:
networkStatus = @"LTE";
break;
case 5:
networkStatus = @"WiFi";
break;
default:
break;
}
}
}
return states;
}
復(fù)制代碼</pre>導(dǎo)致崩潰的原因是：
StatusBar內(nèi)部結(jié)構(gòu)發(fā)生變化，在上面代碼第5行獲取foregroundView的時(shí)候分冈，foregroundView不存在圾另。解決方案：
iPhone X上通過(guò)StatusBar只能獲取到網(wǎng)絡(luò)是WiFi還是蜂窩網(wǎng)，當(dāng)網(wǎng)絡(luò)為蜂窩網(wǎng)的時(shí)候雕沉，無(wú)法獲取到具體的網(wǎng)絡(luò)狀態(tài)集乔。要獲取更具體的網(wǎng)絡(luò)狀況，建議使用官方提供的Reachability坡椒。
<pre class="prettyprint hljs objectivec" style="padding: 0.5em; font-family: Menlo, Monaco, Consolas, "Courier New", monospace; color: rgb(68, 68, 68); border-radius: 4px; display: block; margin: 0px 0px 1.5em; font-size: 14px; line-height: 1.5em; word-break: break-all; word-wrap: break-word; white-space: pre; background-color: rgb(246, 246, 246); border: none; overflow-x: auto;">- (NSString *)getiPhoneNetWorkStates
{
UIApplication *app = [UIApplication sharedApplication];
NSString *states = @"UnKnow";
id statusBar = [app valueForKeyPath:@"statusBar"];
if ([self checkDeviceIsiPhoneX]) {
if ([statusBar isKindOfClass:NSClassFromString(@"UIStatusBar_Modern")]) {
id curData = [statusBar valueForKeyPath:@"statusBar.currentData"];
BOOL wifiEnable = [[curData valueForKeyPath:@"_wifiEntry.isEnabled"] boolValue];
BOOL cellEnable = [[curData valueForKeyPath:@"_cellularEntry.isEnabled"] boolValue];
// iPhone X上通過(guò)StatusBar只能獲取到網(wǎng)絡(luò)是WiFi還是蜂窩網(wǎng)
// 當(dāng)網(wǎng)絡(luò)為蜂窩網(wǎng)的時(shí)候扰路，無(wú)法獲取到具體的網(wǎng)絡(luò)狀態(tài)
if (wifiEnable) {
states = @"WiFi";
} else if (cellEnable) {
states = @"Cellular";
}
}
} else {
NSArray *subViews = [[statusBar valueForKeyPath:@"foregroundView"] subviews];
for (id child in subViews) {
if ([child isKindOfClass:NSClassFromString(@"UIStatusBarDataNetworkItemView")]) {
int networkType = [[child valueForKeyPath:@"dataNetworkType"] intValue];
switch (networkType) {
case 0:
states = @"UnKnow";
break;
case 1:
states = @"2G";
break;
case 2:
states = @"3G";
break;
case 3:
states = @"4G";
break;
case 4:
states = @"LTE";
break;
case 5:
states = @"WiFi";
break;
default:
break;
}
}
}
}
return states;
}
復(fù)制代碼</pre>
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