将 UIView 移动限制为仅垂直或水平轴

我正在使用 PanGestureRecognizer，并在 UIGestureRecognizerStateChanged 中让用户手指移动屏幕上的视图。我将其用于 Tinder 之类的滑动手势，现在我想将视图的移动限制在水平轴或垂直轴上，无论用户开始滑动的方向如何。我在这里上下寻找，但没有找到合适的东西。

是否有任何巧妙的方法来根据用户开始滑动视图的方向来限制轴移动？

非常感谢！

更新：这是移动视图的当前代码：

- (void)dragged:(UIPanGestureRecognizer *)gestureRecognizer
{
    CGFloat xDistance = [gestureRecognizer translationInView:self].x;
    CGFloat yDistance = [gestureRecognizer translationInView:self].y;
//    xDistance = 0;

    [parentView dragged:yDistance];

    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateBegan:{
            self.originalPoint = self.center;
            break;
        };
        case UIGestureRecognizerStateChanged:{
            CGFloat rotationAngel = 0;
            CGFloat scale = 1;//MAX(scaleStrength, 0.93);
            CGAffineTransform transform = CGAffineTransformMakeRotation(rotationAngel);
            CGAffineTransform scaleTransform = CGAffineTransformScale(transform, scale, scale);
            self.transform = scaleTransform;
            self.center = CGPointMake(self.originalPoint.x + xDistance, self.originalPoint.y + yDistance);
            ...
            break;
        };
        case UIGestureRecognizerStateEnded: {
            float moveDistAction = 60;
            if (yDistance > moveDistAction) {
                // view swiped down
                ...
            } else if (yDistance < -moveDistAction) {//100 150
                // view swiped up 
                ...
            } else {
                // dragging cancelled
                ...
            }
            break;
        };
        case UIGestureRecognizerStatePossible:break;
        case UIGestureRecognizerStateCancelled:break;
        case UIGestureRecognizerStateFailed:break;
    }
}

In gestureRecognizerShouldBegin:你可以知道那个方向：

- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer {
    CGPoint translation = [gestureRecognizer translationInView:self.view];
    self.isVerticalPan = fabs(translation.y) > fabs(translation.x); // BOOL property

    return YES;
}

然后在UIGestureRecognizerStateChanged你可以做这样的事情，基于isVerticalPan财产：

CGPoint translation = [gesture translationInView:self.view];
CGPoint displacement = (self.isVerticalPan) ? CGPointMake(0, translation.y) : CGPointMake(translation.x, 0);

self.viewToMove.transform = CGAffineTransformMakeTranslation(displacement.x, displacement.y);