UIViewController的生命周期

  1. LoadView
  2. viewDidLoad
    控制器的view加载完成的时候调用
  3. viewWillAppear
    控制器的view即将显示的时候调用
  4. viewWillLayoutSubviews
  5. viewDidLayoutSubviews
  6. viewDidAppear
  7. viewWillDisappear
  8. viewDidDisappear

4和5中间可能有layoutSubviews

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