iOS 6 UiViewController 的生命周期

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

- (id)init

- (void)loadView

- (void)viewDidLoad

- (void)viewWillLayoutSubviews

- (void)viewDidLayoutSubviews

- (void)viewWillAppear:(BOOL)animated;

- (void)viewDidAppear:(BOOL)animated;

- (void)didReceiveMemoryWarning

- (void)viewWillDisappear:(BOOL)animated;

- (void)viewDidDisappear:(BOOL)animated;

- (void)dealloc