Controller生命周期

1. 实例化 alloc/init, initWithNibName

2.awakeFromNib 从nib创建Controller对象

3.get/set outlets

4. viewDidLoad

5.(几何内容确定时 才进入)viewWill/DidLayoutSubViews

6.viewWill/DidAppear 进入屏幕时

7.(可见内容有变化时 才有)viewWill/DidLayoutSubViews

8.viewWill/DidDisappear 退出屏幕时

9.(内存不足时)didReceivedMemoryWarning

Controller生命周期

原文：http://www.cnblogs.com/fortunely/p/5589477.html