ios - 如何提高按钮的拖动速度？

Question

我正在制作一个拖动代码，其中我正在拖动按钮，现在的问题是当我开始缓慢拖动它时它很酷，但是当我开始快速拖动它时它不能正常工作，因为在拖动过程中按钮掉落。

如何提高拖动速度？

- (void)wasDragged:(UIButton*)button withEvent:(UIEvent*)event{
    CGPoint previousLocation;
    CGPoint location;
    UITouch *touch = [[event touchesForView:button] anyObject];
    previousLocation = [touch previousLocationInView:button];
    location = [touch locationInView:button];
    CGFloat delta_x = location.x - previousLocation.x;
    CGFloat delta_y = location.y - previousLocation.y;
    button.center = CGPointMake(button.center.x + delta_x,button.center.y + delta_y);
}

Answer 1

只需调整增量即可

CGFloat delta_x = location.x - previousLocation.x;
CGFloat delta_y = location.y - previousLocation.y;

delta_x *= 1.5; //the factor of the speed
delta_y *= 1.5;

button.center = CGPointMake(button.center.x + delta_x,button.center.y + delta_y);

Answer 2

为什么不将 button.center 坐标设置为 location.x 和 location.y？因为 location.x 和 location.y 是手指所在位置的坐标，应该是按钮的中心