iOS生命周期调动系统函数过程：
有Storyboard
[ViewController load]
[ViewController initWithCoder:]
[ViewController awakeFromNib]
[ViewController loadView]
[ViewController viewDidLoad]
[ViewController viewWillAppear:]
[ViewController viewWillLayoutSubviews]
[ViewController viewDidLayoutSubviews]
[ViewController viewDidAppear:]
无storyboard
[ViewController load]
[ViewController initWithNibName:bundle:]
[ViewController init]
[ViewController loadView]
[ViewController viewDidLoad]
[ViewController viewWillAppear:]
[ViewController viewWillLayoutSubviews]
[ViewController viewDidLayoutSubviews]
[ViewController viewDidAppear:]
举例子：AViewController push到 BViewController：
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