我正在制作一个拖动代码,其中我拖动按钮,现在问题是当我开始慢慢地拖动它很酷,但是当我开始拖动它快速它不能正常工作导致按钮在拖动期间掉落。
如何提高阻力?
- (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);
}
答案 0 :(得分:0)
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);
答案 1 :(得分:0)
为什么你不设置button.center coordonates为location.x和location.y?因为location.x和location.y是手指所在的坐标,应该有按钮的中心