UIRotationGestureRecgnizer 委托方法未触发

Question

我使用 DGCharts 库来显示饼图。 该图表位于垂直滚动视图内，并且图表能够绕其轴旋转。 这只需一次滑动即可工作，但是滚动视图滑动/平移手势会妨碍并接管。 我想在图表旋转时阻止 scollviews 手势识别器。

饼图有一个 UIRotationGestureRecognizer 和一个 UITapGestureRecognizer。 使用我尝试过的 UIGestureRecognizer 委托方法

    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        // Allow the rotation gesture to work alongside the scroll view's pan gesture
        if gestureRecognizer is UIRotationGestureRecognizer || otherGestureRecognizer is UIRotationGestureRecognizer {
            return true
        }
        return false
    }
    
    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        if gestureRecognizer == scrollView.panGestureRecognizer {
            // If the pan gesture recognizer is triggered and the touch is inside `yourView`, prevent the scroll view from scrolling
            let locationInView = touch.location(in: pieChartView)
            if pieChartView.bounds.contains(locationInView) {
                return false // Disable the scroll view's pan gesture when touching `yourView`
            }
        }

        // Otherwise, allow the gesture to be received as usual
        return true
    }

我也尝试过

scrollView.panGestureRecognizer.require(toFail: rotationRecognizer)

两者都没有成功。

我确实设置了委托：

        if let pieViewRecognizers = pieChartView.gestureRecognizers {
            for gestureRecognizer in pieViewRecognizers {
                if gestureRecognizer is UIRotationGestureRecognizer {
                    gestureRecognizer.delegate = self
                }
            }
        }

主要问题似乎是 UIRotationGestureRecognizer 需要两根手指触摸来触发使用时禁用滚动视图所需的委托方法，但我可以用单根手指和 id 滑动和旋转图表，以防止滚动视图接管如果单个手指滑动图表。

当我尝试旋转图表时，我还能尝试什么来阻止滚动视图移动？

Answer 1

出于这个特定原因，该库具有

.rotationWithTwoFingers

属性。对此财产状态的评论

flag that indicates if rotation is done with two fingers or one. when the chart is inside a scrollview, you need a two-finger rotation because a one-finger rotation eats up all touch events.