检测点击转换后的 CAShapeLayer 路径

Question

我在一个视图上有多个 CAShapeLayer，它们都可以使用 CATransform3D 进行转换。

我找到了一种方法来准确检测这些层路径上或内部的点击，但它仅在层未转换时才有效。

我怎样才能让它在所有情况下都能正常工作？

@objc private func userTapped(recognizer: UITapGestureRecognizer) {
        let tapLocation = recognizer.location(in: canvas)

        for shapeLayer in shapeLayers {
            guard let path = shapeLayer.path else { continue }

            let tempPath = path.copy(strokingWithWidth: CGFloat(lineWidth * 2), lineCap: .round, lineJoin: .round, miterLimit: .zero)

            if tempPath.contains(tapLocation) {
                // DO SOMETHING
            }
        }
    }

Answer 1

您需要在变换层自己的几何图形中获取抽头位置。

@objc private func userTapped(recognizer: UITapGestureRecognizer) {
    let canvasLocation = recognizer.location(in: canvas)

    for shapeLayer in shapeLayers {
        guard let path = shapeLayer.path else { continue }
        let shapeLocation = shapeLayer.convert(canvasLocation, from: canvas.layer)

        let tempPath = path.copy(strokingWithWidth: CGFloat(lineWidth * 2), lineCap: .round, lineJoin: .round, miterLimit: .zero)

        if tempPath.contains(shapeLocation) {
            // DO SOMETHING
        }
    }
}

检测点击转换后的 CAShapeLayer 路径

Detect tap on a transformed CAShapeLayer’s path

core-animation

uikit

cashapelayer

ios

swift