UIViewController 的整个生命周期

  1. init
  2. loadViewIfNeeded
  3. loadView
  4. viewDidLoad
  5. viewWillAppear:
  6. viewDidAppear:
  7. viewWillLayoutSubviews
  8. viewDidLayoutSubviews
  9. viewWillDisappear:
  10. viewDidDisappear:

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