在手指触摸它/被拖动时更改UIButton尺寸

Question

我有一个可拖动的UIButton。我希望它在被拖动或触摸时有不同的背景图像。我想使用的图像是普通图像的两倍。我试过了正常的事情：

[button setBackgroundImage:buttonHighlightedImage forState:UIControlStateHighlighted];

但这不起作用。任何想法或提示将不胜感激。

Answer 1

这个怎么样：

            [button addTarget:self action:@selector(btnTouch:) 
    forControlEvents:UIControlEventTouchDown];
            [button addTarget:self action:@selector(btnTouchCancel:) 
    forControlEvents:UIControlEventTouchCancel];

            -(void)btnTouch:(id)sender{
                UIButton *button=sender;
                [button setBackgroundImage:buttonHighlightedImage forState:UIControlStateNormal];
            }

            -(void)btnTouchCancel:(id)sender{
                UIButton *button=sender;
                [button setBackgroundImage:buttonNormalImage forState:UIControlStateNormal];
            }