런타임 알림 메시지

-(void)applicationDidReceiveMemoryWarning:(UIApplication *)application
-(void)applicationSignificantTimeChange:(UIApplication *)application
-(void)applicationWillResignActive:(UIApplication *)application
-(void)applicationDidBecomeActive:(UIApplication *)application
-(void)applicationDidEnterBackground:(UIApplication *)application
-(void)applicationWillEnterForeground:(UIApplication *)application