iphone - 双击按钮

Question

如何添加双击按钮的操作？

Answer 1

- (void) buttonTouchDownRepeat:(id)sender event:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    if(touch.tapCount == 2) {
        NSLog(@"Twice");
    }
    else {
        NSLog(@"otherwise");
    }
}