Iphone Cocos2d中的SwipeGesture

Question

我正在使用UISwipeGestureRecognizer在iPhone中获取滑动手势。我希望在滑动触摸开始和滑动触摸结束时获得2个位置点。我已经实现了滑动触摸方法，如下所示

- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {

    CGPoint touchLocation = [recognizer locationInView:recognizer.view];
    touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];
    touchLocation = [self convertToNodeSpace:touchLocation];

    CCLOG(@"Hello %@ - %d",NSStringFromCGPoint(touchLocation),recognizer.state);

    if (recognizer.state == UIGestureRecognizerStateBegan) {

        CGPoint touchLocation = [recognizer locationInView:recognizer.view];
        touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];
        touchLocation = [self convertToNodeSpace:touchLocation];

        CCLOG(@"UIGestureRecognizerStateBegan %@",NSStringFromCGPoint(touchLocation));

    } else if (recognizer.state == UIGestureRecognizerStateChanged) {    

        CCLOG(@"UIGestureRecognizerStateChanged");

    } else if (recognizer.state == UIGestureRecognizerStateEnded) {
        CGPoint touchLocationEnd = [recognizer locationInView:recognizer.view];
        touchLocationEnd = [[CCDirector sharedDirector] convertToGL:touchLocationEnd];
        touchLocationEnd = [self convertToNodeSpace:touchLocationEnd];
        CCLOG(@"UIGestureRecognizerStateEnded %@",NSStringFromCGPoint(touchLocationEnd));
        }        

    //}
}

我的滑动触控功能正常。但它只显示UIGestureRecognizerStateEnded。即使我在屏幕上滑动，我的触摸尚未结束，但StateEnded被调用。我如何调用StateBegin并获取位置，然后调用StateEnd。现在只有StateEnded正在工作，其他两个开始和改变都不起作用。

Answer 1

<强>更新 我找到了原因：

  

滑动是离散手势，因此是关联的动作消息   每个手势只发送一次。

这张图片：

因此UISwipeGestureRecognizer只有三种状态：可能，已识别并已结束。但我仍然不知道为什么可能不被召唤。

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我尝试了您的代码并获得了相同的结果。我也不知道为什么会这样。如果您找不到此问题的解决方案，我建议您使用触摸方法自行分析触摸。这肯定可以处理事件，但比使用手势识别器有点复杂。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;