uiviewcontroller_lifecycle
平时在讲ViewController的生命周期时，我们只大多只关注以下六个方法：
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viewDidLoad
*viewWillAppear viewDidAppearviewWillDisappearviewDidDisappearviewDidUnload
其实ViewController的生命周期如下：
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loadView[1] -
viewDidLoad[1] viewWillAppear-
viewWillLayoutSubviews[2]Called to notify the view controller that its view is about to layout its subviews.
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viewDidLayoutSubviews[2]
Called to notify the view controller that its view has just laid out its subviews.
viewDidAppearviewWillLayoutSubviewsviewDidLayoutSubviewsviewWillDisappearviewDidDisappearviewDidUnload
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If you manually nil out your view during
didReceiveMemoryWarning,loadViewandviewDidLoadwill be called again. That is, by defaultloadViewandviewDidLoadonly gets called once per view controller instance. ↩ ↩ -
May be called an additional 0 or more times .
viewWillLayoutSubviewsandviewDidLayoutSubviewswill also be called at other times when subviews of the main view are loaded, for example when cells of a table view or collection view are loaded. ↩ ↩
