iphone - cocos2d-iOS - 手势识别器

Question

有人设法在 cocos-2d 中实现手势识别吗？

我在这里读过一篇文章，声称已经实现了这一目标，在这里:http://www.cocos2d-iphone.org/forum/topic/8929

我从这里的 git hub 打了补丁:https://github.com/xemus/cocos2d-GestureRecognizers/blob/master/README

我创建了 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(delegate)方法:

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

我的点击事件从未被调用。

有人成功了吗？手动进行手势识别以进行滑动检测有多困难？

Answer 1

您需要将手势识别器附加到“链上游”的东西上。不要将它们附加到各个节点；将它们附加到 UIView(即 [[CCDirector sharedDirector] openGLView])。

这就是我所做的:

- (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];
}

此特定代码用于场景 Controller 的父类(super class)中，因此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，您还可以推断上述内容，轻松创建轻击、捏合等手势识别器。

在 Controller 的子类中，我只需这样做:

- (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;
    }

}