iOS ViewController가 홈버튼에서 돌아올때, 어떠한 메소드가 실행되길 원한다면아래와 같이 선언을 해두면 된다. [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(yourMethod) name:UIApplicationDidBecomeActiveNotification object:nil]; 참고 : http://stackoverflow.com/questions/11928126/how-can-i-use-applicationdidbecomeactive-in-uiviewcontroller/11928261#11928261