【UIKit-125-6】#import <UIKit/UIViewController.h>

【子视图控制器的lifeCycle】
@interface UIViewController (UIContainerViewControllerCallbacks)

- (BOOL)shouldAutomaticallyForwardAppearanceMethods
NS_AVAILABLE_IOS(6_0);

//该方法返回NO则childViewController不会自动viewWillAppear和viewWillDisappear对应的方法
- (BOOL)shouldAutomaticallyForwardAppearanceMethods
{
return NO;
}

//都写在子视图控制器中。
- (void)willMoveToParentViewController:(UIViewController *)parent
NS_AVAILABLE_IOS(5_0);
- (void)didMoveToParentViewController:(UIViewController *)parent
NS_AVAILABLE_IOS(5_0);

-(void)willMoveToParentViewController:(UIViewController *)parent{
NSLog(@"willmoveto");//add时调用
}

-(void)didMoveToParentViewController:(UIViewController *)parent{
NSLog(@"didmoveto");//remove时调用
}

@end