cocos2d中捏合时如何缩放精灵？

我正在开发一个应用程序，我必须显示 50 到 70 个图像（精灵）。我制作了一个滚动条，可以滚动所有这些图像，但我也想缩放这些图像，我一直在关注"http://ganbarugagames.com/2010/12/detecting-touch-events-in-cocos2d-iphone/ http://ganbarugames.com/2010/12/detecting-touch-events-in-cocos2d-iphone/"这个教程。我想要完全相同的东西，但是该教程只为单个精灵制作了缩放功能，但我希望每个精灵都可以缩放，我该怎么办？请帮我一下？

-(void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
  {
    CGPoint touchPoint = [touch locationInView:[touch view]];

    touchPoint = [[CCDirector sharedDirector]convertToGL:touchPoint];
   self.position = ccp((-(currentScreen-1)*scrollWidth)+(touchPoint.x-startSwipe),0);

--> NSArray *touchArray = [touches allObjects];
if([touchArray count] > 1)
{
    UITouch *fingerOne = [touchArray objectAtIndex:0];
    UITouch *fingerTwo = [touchArray objectAtIndex:1];

    CGPoint pointOne = [fingerOne locationInView:[fingerOne view]];
    CGPoint pointTwo = [fingerTwo locationInView:[fingerTwo view]];

pointOne = [[CCDirector sharedDirector] convertToGL:pointOne];
    pointTwo = [[CCDirector sharedDirector] convertToGL:pointTwo];

    float distance = sqrt(pow(pointOne.x - pointTwo.x, 2.0) + pow(pointOne.y - pointTwo.y, 2.0));

    float scale = distance / [CCDirector sharedDirector].winSize.width * 5;
    [backgroundScroll setScale:scale];
}

} 这是我正在使用的代码，但它在代码中提到的箭头处向我发出警告，“UITouch”可能不会响应 -allObjects'

请帮帮我......

终于我找到了解决方案，就这样

UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(makepinch:)];  

[[[CCDirector sharedDirector] openGLView] addGestureRecognizer:pinch];

将他的代码放入您的 init 方法中，然后添加

-(void)makepinch:(UIPinchGestureRecognizer*)pinch
{
    if(pinch.state == UIGestureRecognizerStateEnded)
    {

        currentScale = pinch.scale;
    }
    else if(pinch.state == UIGestureRecognizerStateBegan && currentScale != 0.0f)
    {

        pinch.scale = currentScale;
    }
    if(pinch.scale != NAN && pinch.scale != 0.0)
    {
        pinch.view.transform = CGAffineTransformMakeScale(pinch.scale, pinch.scale);
    }
}