Question

我有UIPanGestureRecognizer，我试图让它只向一个方向滑动（向上）。我还没有找到一个有效的解决方案。谢谢。这是我目前的代码：

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

CGPoint t = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + t.x, recognizer.view.center.y + t.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];

}

Answer 1

- (void)panGesture:(UIPanGestureRecognizer *)recognizer {
    CGPoint t = [recognizer translationInView:self.view];

    if (t.y < 0) {
        t = CGPointMake(0, t.y);
    }
    else {
        t = CGPointMake(0, 0); // look at this
    }

    recognizer.view.center = CGPointMake(recognizer.view.center.x + t.x,
                                         recognizer.view.center.y + t.y);

    [recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
}

为了能够上下拖动，请使用CGPointMake(0, t.y);而不是我的if

将UIPanGestureRecognizer锁定到某个方向

1 个答案: