UIViewController在显示过程中，各个方法的调用顺序是 init->viewDidLoad->viewDidAppear->viewDidUnload init->viewDidAppear->viewDidLoad->viewDidUnload init->viewDidLoad->viewDidUnload ->viewDidAppear init->viewDidAppear->viewDidUnload->viewDidLoad

  UIViewController在显示过程中，各个方法的调用顺序是

init->viewDidLoad->viewDidAppear->viewDidUnload

init->viewDidAppear->viewDidLoad->viewDidUnload

init->viewDidLoad->viewDidUnload ->viewDidAppear

init->viewDidAppear->viewDidUnload->viewDidLoad

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草泥马

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