按下滑动按钮

Question

我想制作一个滑动按钮，因此当用户从右向左滑动按钮时，按钮也会从右向左绘制，最后它会推动另一个视图，任何人都可以为其提供示例代码。

Answer 1

// make button  

UIButton*btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 [btn setFrame:CGRectMake(50, 50, 50, 50)];
 [btn addTarget:self action:@selector(wasDragged:withEvent:)
              forControlEvents:UIControlEventTouchDragInside];
 [self.view addSubview:btn];


// here swipe buttons


- (void)wasDragged:(UIButton *)button withEvent:(UIEvent *)event
{
    // get the touch
    UITouch *touch = [[event touchesForView:button] anyObject];

    // get delta
    CGPoint previousLocation = [touch previousLocationInView:button];
    CGPoint location = [touch locationInView:button];
    CGFloat delta_x = location.x - previousLocation.x;
    CGFloat delta_y = location.y - previousLocation.y;

    // move button
    CGPoint moveBtnCenter = CGPointMake(button.center.x + delta_x,
                                        button.center.y + delta_y);
    button.center = moveBtnCenter;

    NSArray* allSubViews = [self.view subviews];
    for (UIView*subView in allSubViews)
    {
        if ([subView isKindOfClass:[UIButton class]])
        {
            CGPoint subViewCenter = subView.center;
            if (CGPointEqualToPoint(moveBtnCenter, subViewCenter))
            {
                subView.center = previousLocation;
            }
        }
    }
}