崩潰原因
crash：
Assertion?failure?in?
-[UIApplication?_runWithMainScene:transitionContext:completion:],?/BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-
（
***?Terminating?app?due?to?uncaught?exception?'NSInternalInconsistencyException',?`enter?code?here`reason:?'Application?windows?are?expected?to?have?a?root
view?controller?at?the?end?of?application?launch'***?First?throw?call?stack:
）
?嘗試解決方案一：
// ?*************代碼做調整，加入到下一個loop周期中，再次運行代碼，程序正常。******//
- (void)applicationDidBecomeActive:(UIApplication *)application {// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.//crash in ios9_testWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];_testWindow.hidden = NO;//ok// dispatch_async(dispatch_get_main_queue(), ^{// _testWindow = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];// _testWindow.hidden = NO;// }); }
Or
?嘗試解決方案二：
Xcode7 需要所有的窗口都必須有根控制器
XCODE 7 requires that all the Windows must have a rootViewController You can use easy:
UIViewController* vc = [[UIViewController alloc]initWithNibName:nil bundle:nil];self.window.rootViewController = vc; It's working good if you need to use only UIWindow (for easy examples from any Tutorials - before Xcode 7)!
)
