运行功能后
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
发生了崩溃:
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:
(
0 CoreFoundation 0x0000000109377885 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000108df0df1 objc_exception_throw + 48
2 CoreFoundation 0x00000001093776ea +[NSException raise:format:arguments:] + 106
3 Foundation 0x0000000108a42bb1 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
4 UIKit 0x000000010760e350 -[UIApplication _runWithMainScene:transitionContext:completion:] + 2875
5 …