cocos2d-iOS - 手势识别器

Question

cocos2d-iOS - 手势识别器

9

有人成功地在cocos-2d中实现了手势识别吗？我在这里读到了一篇帖子声称已经实现了，链接在这里：http://www.cocos2d-iphone.org/forum/topic/8929。我从这里的git hub打补丁：https://github.com/xemus/cocos2d-GestureRecognizers/blob/master/README。我创建了一个CCSprite的子类（它是CCNode的子类）：

-(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;
}

委托方法：

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

我的tap事件从未被调用过。

有人做过这个吗？手动实现滑动检测的手势识别有多难？

- Robert

2个回答

6

如果您不想手动处理所有事情，我创建了一个简单的类别，将手势识别器添加到任何cocos2d版本中。阅读更多内容请访问：http://www.merowing.info/2012/03/using-gesturerecognizers-in-cocos2d/ 或从github获取：https://github.com/krzysztofzablocki/CCNode-SFGestureRecognizers。

- Krzysztof Zabłocki

这太棒了！只需确保使用ccTouches方法的节点在具有手势识别器的节点上方。 - TigerCoding

在Cocos2d 3.0中，没有可见的接口来使用[YourCCSprite addGestureRecognizer:YourGestureRecognizer]; 有什么解决方案吗？ - Vishal Sharma

有关Cocos2d 3.0的gestureRecognizer类会有更新吗？这真的很重要，也是一个缺失的部分。 - lionserdar

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可以查看英文原文，
原文链接

- cc. · Accepted Answer

你需要将手势识别器连接到“上级”对象。不要将它们附加到单个节点上，而是将它们附加到UIView（即[[CCDirector sharedDirector] openGLView]）上。

这是我的做法：

- (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];
}

这段代码用于场景控制器的超类中，所以选择器的目标被硬编码为“self”，但您可以轻松地将其抽象为传入的对象。此外，您可以将上述内容推广到轻松创建手势识别器，例如单击、捏等。

在控制器的子类中，我只需要这样做：

- (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;
    }

}