如何实现手势识别功能？

Question

大家知道如何实现cocos2d中的手势识别吗？我在一篇文章中，看到过类似效果的实现方法：
http://www.cocos2d-iphone.org/forum/topic/8929
在github上找到了相关的补充资料：
https://github.com/xemus/cocos2d-GestureRecognizers/blob/master/README
此外，我创建了一个CCSprite（CCNode的子类别）的子类别：

-(id) initWithTexture:(CCTexture2D*)texture rect:(CGRect)rect {
if( (self=[super initWithTexture:texture rect:rect]) )
{
    CCGestureRecognizer* recognizer;
    recognizer = [CCGestureRecognizer 
        CCRecognizerWithRecognizerTargetAction:[[[UITapGestureRecognizer alloc]init] autorelease] 
                  target:self 
                  action:@selector(tap:node:)];
    [self addGestureRecognizer:recognizer];
}
return self;
}

delegate方法：

- (void) swipe:(UIGestureRecognizer*)recognizer node:(CCNode*)node
{
NSLog(@" I never get called :( ");
}

在这种方法下，我设定的点击事件（tap event）始终不响应。
大家遇到过类似的问题吗？在cocos2d中实现swipe detection的手势识别很困难吗？

原问题：cocos2d-iOS - Gesture recognisers

Answer 1

答：cc.
你需要将手势识别器（gesture recognizer）添加到"up the chain"中。不要只添加这些代码，而是要将他们和UIView结合在一起（例如：[[CCDirector sharedDirector] openGLView]）
我的做法是：

- (UIPanGestureRecognizer *)watchForPan:(SEL)selector number:(int)tapsRequired {
    UIPanGestureRecognizer *recognizer = [[[UIPanGestureRecognizer alloc] initWithTarget:self action:selector] autorelease];
    recognizer.minimumNumberOfTouches = tapsRequired;
    [[[CCDirector sharedDirector] openGLView] addGestureRecognizer:recognizer];
    return recognizer;
}

- (void)unwatch:(UIGestureRecognizer *)gr {
    [[[CCDirector sharedDirector] openGLView] removeGestureRecognizer:gr];
}

这段特殊的代码是用在超场景控制器中（scene controller），所以选择器的目标是筛选出，可以进行“自我”硬式编码（hard-code）的代码。
对于控制器的子类别，我是这样做的：

- (MyController *)init {
    if ((self = [super init])) {
        [self watchForPan:@selector(panning:) number:1];
    }
    return self;
}

- (void)panning:(UIPanGestureRecognizer *)recognizer {

    CGPoint p;
    CGPoint v;

    switch( recognizer.state ) {
        case UIGestureRecognizerStatePossible:
        case UIGestureRecognizerStateBegan:
            p = [recognizer locationInView:[CCDirector sharedDirector].openGLView];
            (do something when the pan begins)
            break;
        case UIGestureRecognizerStateChanged:
            p = [recognizer locationInView:[CCDirector sharedDirector].openGLView];
            (do something while the pan is in progress)
            break;
        case UIGestureRecognizerStateFailed:
            break;
        case UIGestureRecognizerStateEnded:
        case UIGestureRecognizerStateCancelled:
            (do something when the pan ends)
            (the below gets the velocity; good for letting player "fling" things)
            v = [recognizer velocityInView:[CCDirector sharedDirector].openGLView];
            break;
    }

}

答：Krzysztof Zabłocki
如果你不想人为控制一切操作，我建议你可以创建一种简单的类别，用来添加手势识别功能，详情可查看：
http://www.merowing.info/2012/03/using-gesturerecognizers-in-cocos2d/
或者可以在github上找到这种功能的实现源码：https://github.com/krzysztofzablocki/CCNode-SFGestureRecognizers

Answer 2

在ios端，我们的开发在构建这个手势密码的时候，我这边提供了@2x的圆圈给它，但是开发输出出来，还是有模糊像素的问题

我如何向开发进行建议呢，还是说设计的圆圈本身在ios端的显示存在问题