崩溃原因

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: ）

 尝试解决方案一：

//  *************代码做调整，加入到下一个loop周期中，再次运行代码，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  尝试解决方案二： Xcode7 需要所有的窗口都必须有根控制器 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)!

转载于:https://www.cnblogs.com/mysticCoder/p/5072589.html

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