如何使用UITouch在视图上移动一个与其他图像相交的图像

Question

我正在使用UITouch方法从左到右和从右到左移动imageView。为此，我使用下面的补丁和它正常工作

-(void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    UITouch *touch1 = [[event allTouches] anyObject];
    CGPoint location = [touch1 locationInView: self.view];

    if ([touch1 view] == _ballimg)
    {
        if (location.x<=268 && location.x>=20)
        {
            [UIView beginAnimations:nil context:NULL];
            [UIView setAnimationDuration:1.0];
            CGRect rect = CGRectMake(location.x,  _ballimg.frame.origin.y,_ballimg.frame.size.height, _ballimg.frame.size.width);
            [_ballimg setFrame:rect];

            [UIView commitAnimations];
        }
    }
    if ([touch1 view] == _ballimg1)
    {
        if (location.x<=312 && location.x>=64)
        {
            [UIView beginAnimations:nil context:NULL];
            [UIView setAnimationDuration:1.0];
            CGRect rect = CGRectMake(location.x,  _ballimg1.frame.origin.y,_ballimg1.frame.size.height, _ballimg1.frame.size.width);
            [_ballimg1 setFrame:rect];

            [UIView commitAnimations];
        }
    }     
}

但是现在当两个图像相交时，我必须从当前触摸的图像视图中从左到右或从右到左推动相交的imageView。什么是最好的方法？