同样一份代码，用ios8的模拟器没问题，ios9会崩溃，报错：Application windows are expected to have a root view controller at the end of application launch
代码块：
– (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// UIViewController* vc = [[UIViewController alloc] init];
// self.window.rootViewController = vc;
// vc.view.backgroundColor = [UIColor yellowColor];
// [self.window makeKeyAndVisible];
//
// return YES;
代码块：
– (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// UIViewController* vc = [[UIViewController alloc] init];
// self.window.rootViewController = vc;
// vc.view.backgroundColor = [UIColor yellowColor];
// [self.window makeKeyAndVisible];
//
// return YES;
self.window.rootViewController = [[EventViewController alloc] init];
[self.window makeKeyAndVisible];
return YES;
}
1.在ios8模拟器环境下，运行OK
2.在ios9模拟器环境下，运行注释掉的那部分代码是OK的，运行本人定义的eventViewcontroller，就会崩溃
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