如何提高按钮的拖拽速度？

Question

我正在做一个拖拽代码，我在其中拖拽按钮，现在的问题是当我开始缓慢地拖拽它时，它工作很酷，但当我开始拖拽它时，它不工作，这是因为在拖拽过程中按钮掉了。

我怎样才能提高拖拽的速度？

- (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

简单地说，您只需调整增量

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

为什么不直接将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