//控制器View加载完毕时
- (void)viewDidLoad;
//控制器VIew的即将显示
- (void)viewWillAppear:(BOOL)animated;
//控制器View已经显示
- (void)viewDidAppear:(BOOL)animated;
//控制器View即将消失
- (void)viewWillDisappear:(BOOL)animated;
//控制器View已经消失
- (void)viewDidDisappear:(BOOL)animated;
//内存警告释放内存
- (void)didReceiveMemoryWarning
//过时的方法
//控制器View即将被销毁
- (void)viewWillUnload
//控制器的View 已经被销毁
- (void)viewDidUnload
程序的启动过程
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