한번에 한 버튼만 클릭되게 하기

(IBAction)onBtnDown:(id)sender 호출

Touch Down

(IBAction)onBtnReleased:(id)sender 호출

Touch Up Inside : 원하는 버튼 기능 수행
Touch Up Outside
Touch Cancel

- (IBAction)onBtnDown:(id)sender{
    
    if(sender == _btnFacebook){
        _btnGoogle.enabled = false;
        _btnEmail.enabled = false;
        
    }else if(sender == _btnGoogle){
        _btnFacebook.enabled = false;
        _btnEmail.enabled = false;
 
    }else if(sender== _btnEmail){
        _btnFacebook.enabled = false;
        _btnGoogle.enabled = false;
    }
}
 
- (IBAction)onBtnTouchUp:(id)sender {
    
    if(sender == _btnFacebook){
        
    }else if(sender == _btnGoogle){
        
    }else if(sender== _btnEmail){
 
    }
}
 
- (IBAction)onBtnReleased:(id)sender {
    _btnFacebook.enabled = true;
    _btnGoogle.enabled = true;
    _btnEmail.enabled = true;
}