ios - 如何使用 Objective-C 移动多个对象

Question

这是我的代码

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *myTouch = [[event allTouches] anyObject];
    UITouch *myTouch2 = [[event allTouches] anyObject];
    UITouch *myTouch3 = [[event allTouches] anyObject];

    button.center = [myTouch locationInView:self.view];
    button2.center = [myTouch2 locationInView:self.view];
    button3.center = [myTouch3 locationInView:self.view];   
}

问题是，当我尝试移动其中一个按钮时，它们都在同一时间和同一位置移动。我希望能够单独自由地移动按钮。我怎么做？有什么建议吗？

Answer 1

使用以下内容确定它是哪个按钮:

UITouch *touch = [[event touchesForView:self.view] anyObject];

CGPoint location = [touch locationInView:touch.view];

if(CGRectContainsPoint(button.frame, location)) 
{
    button.center = [myTouch locationInView:self.view];

}
else if(CGRectContainsPoint(button2.frame, location)) 
{
    button2.center = [myTouch locationInView:self.view];

}
else if(CGRectContainsPoint(button3.frame, location)) 
{
    button3.center = [myTouch locationInView:self.view];

}