好多文章都写得很含糊，还是自己做一下笔记吧
使用code创建的ViewController
convenience init
super.init(nibName:, bundle:)
loadView
viewDidLoad
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear
使用IB创建的ViewController，加载顺序如下(viewWillLayoutSubviews可能调用多次)
init coder
awakeFromNib
loadView
viewDidLoad
viewWillAppear
viewWillLayoutSubviews
viewDidLayoutSubviews
viewDidAppear
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