NSNotificationCenter通知发送和拦截

[[NSNotificationCenter defaultCenter] postNotificationName:BGRemoveGestureNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(BGRemoveGestureClick) name:BGRemoveGestureNotification object:nil];

UIKIT_EXTERN  NSString  *constBGRemoveGestureNotification ;

NSString  *constBGRemoveGestureNotification =@"BGRemoveGestureNotification";

- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}