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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)!
关于升级xcode7 编译崩溃-[UIApplication _runWithMainScene:transitionContext:completion:] 问题
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原文地址：http://www.cnblogs.com/mysticCoder/p/5072548.html
