iphone - 在 UISwipeGesture[Recognizer] 之后检测手指何时抬起

Question

我已经设置了一个 UISwipeGestureRecognizer:

UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:delegate action:@selector(handleSwipeGesture:)];
swipe.direction = UISwipeGestureRecognizerDirectionUp;
[self addGestureRecognizer:swipe];
[swipe release];

滑动使玩家向滑动的方向移动。不过，我需要玩家继续移动，直到进行滑动的手指离开屏幕。我试过使用 touchesEnded: 方法，但它要求先进行非滑动触摸。我怎样才能得到做出滑动手势的触摸？如何检测该触摸何时离开屏幕？

Answer 1

我知道您已经对这个问题的答案感到满意，但我想我可能会推荐使用 UIPanGestureRecognizer 而不是滑动手势。

使用平移手势识别器，消息会重复发送到选择器，直到用户停止拖动他们的手指，此时再次调用选择器，传递 gesture.state UIGestureRecognizerStateEnded。示例:

- (void)panGesture:(UIPanGestureRecognizer *)gesture {
    if (gesture.state == UIGestureRecognizerStateEnded) {
        CGPoint translation = [gesture translationInView:self.view];
        //This contains the total translation of the touch from when it 
        //first recognized the gesture until now.
        //
        //e.g (5, -100) would mean the touch dragged to the right 5 points, 
        //and up 100 points.
    }
}