我的 RootViewController 的 viewDidLoad 被 application:didFinishLaunchingWithOptions: 和 applicationDidBecomeActive: 调用
我正在使用带有 UINavigationController 的 Storyboard，该 UINavigationController 设置为“初始视图控制器”。它附加了 RootViewControllers。 viewDidLoad 方法在 application:didFinishLaunchingWithOptions: 和 applicationDidBecomeActive: 之后调用。
为什么会发生这种情况？
I am using a Storyboard with a UINavigationController that is set as "is initial View Controller". It's attached RootViewControllers. viewDidLoad method gets called after application:didFinishLaunchingWithOptions: and applicationDidBecomeActive:.
Why does that happen?
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因为视图是在应用程序激活之前加载的。活动被定义为应用程序开始响应事件的点，您需要一个视图来实现这一点。
Because the view is loaded before your application becomes active. Active is defined as the point at which your application begins responding to events, and you need a view for this.
如果您想知道为什么在这些方法之后调用
viewDidLoad方法，我建议您阅读 应用程序启动序列-ios。这是每个 iOS 应用程序中正常的引导执行。当您实例化具有关联视图的控制器时，该控制器的视图需要一些时间才能加载到内存中。
viewDidLoad不会立即调用，而是仅在视图完全加载时调用。在这里，您可以确保该视图的出口已正确链接。希望有帮助。
If you want to know why
viewDidLoadmethod gets called after those methed I suggest you to read the app-launch-sequence-ios. It's the normal bootstrap execeution in every iOS application.When you istantiate a controller with an associated view, the view for that controller takes some time to load in memory.
viewDidLoadis not called immediately but only when the view has been loaded completely. Here you are sure that outlet for that view are linked correctly.Hope it helps.