ios button长按事件

UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom]; 

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(btnLong:)];

longPress.minimumPressDuration = 0.5; //定义按的时间

[btn addGestureRecognizer:longPress];

-(void)btnLong:(UILongPressGestureRecognizer *)gestureRecognizer{

    if ([gestureRecognizer state] == UIGestureRecognizerStateBegan) {

       NSLog(@"长按开始");

    } else if ([gestureRecognizer state] == UIGestureRecognizerStateEnded) {

       NSLog(@"长按结束");

    }

}