ios - 检测描边 uibezierpath 包含点

Question

我正在我的 View 中绘制一条描边路径。我正在尝试查看描边路径是否包含特定点。但 contains 方法不会检测该点是否位于描边路径中。

func checkCollision(currentPoint:CGPoint) -> CustomShape?{
    for shape in customShapes {
        //Check if current shapes uibezierpath contains a point
        if (shape.path.contains(currentPoint)) {
            return shape
        }
    }
    return nil
}

Answer 1

swift 5.x

您可以使用此扩展程序来快速获得答案:

extension UIBezierPath {
    func isInsideBorder(_ pos:CGPoint, tolleranceWidth:CGFloat = 2.0)->Bool{
        let pathRef = cgPath.copy(strokingWithWidth: tolleranceWidth, lineCap: CGLineCap.butt, lineJoin: CGLineJoin.round, miterLimit: 0)
        let pathRefMutable = pathRef.mutableCopy()
        if let p = pathRefMutable {
            p.closeSubpath()
            return p.contains(pos)
        }
        return false
    }
}

<小时/>

用法:

var currentPoint:CGPoint= CGPoint.zero
if yourBeizerPath.isInsideBorder(currentPoint, tolleranceWidth:3.0) {
   /// Let's go, it's inside..
}