躯体老是以惹人腻烦了却。除思惟以外，没有什么精美和有意思的器材留下来，因为思惟就是生命。viewWillAppear 
Called when the view is about to made visible. Default does nothing
视图即将可见时调用。默认景象下不履行任何操纵
viewDidAppear
Called when the view has been fully transitioned onto the screen. Default does nothing
视图已完全过渡到屏幕上时调用
viewWillDisappear:
Called when the view is dismissed， covered or otherwise hidden. Default does nothing
视图被驳回时调用，覆盖或以其他体式格式隐蔽。默认景象下不履行任何操纵
viewDidDisappear:
Called after the view was dismissed， covered or otherwise hidden. Default does nothing
视图被驳回后调用，覆盖或以其他体式格式隐蔽。默认景象下不履行任何操纵
loadView;?
This is where subclasses should create their custom view hierarchy if they aren""t using a nib. Should
never be called directly.
这是当他们没有正在应用nib视图页面，子类将会创建本身的自定义视图层。毫不克不及直接调用。
viewDidLoad;
Called after the view has been loaded. For view controllers created in code， this is after -loadView.
For view controllers unarchived a nib， this is after the view is set.
在视图加载后被调用，若是是在代码中创建的视图加载器，他将会在loadView办法后被调用，若是是从nib视图页面输出，他将会在视图设置好后后被调用