简单的问题......应用程序是否有必要在调用'viewDidAppear'之前完成启动？
更详细......
我的初始视图控制器的NSNotificationCenter.defaultCenter().addObserver(self, selector: "didFinishLaunching", name: UIApplicationDidFinishLaunchingNotification, object: nil)中有viewDidLoad。
我想知道在viewDidAppear之后是否始终会调用didFinishLaunching？]
谢谢！