Swift iOS：确定贝塞尔曲线路径是否与 UIView 框架相交

我已经创建了一个定制的UIView，它绘制UIBezierPath，将其分配给CAShapeLayer，然后将其屏蔽到UIView的根层.现在，我try 使用以下代码确定不同的UIView是否与该自定义视图中的Bezier路径的任何部分相交(或重叠):

    let customView = … // define UICustomView

    let purpleView = UIView(frame: CGRect(x: 30, y: 500, width: 100, height: 50))
    purpleView.backgroundColor = UIColor.purple
    self.view.addSubview(purpleView)
    
    if purpleView.frame.intersects((customView.shapeLayer.path?.boundingBoxOfPath)!) == true { 
        print("Overlapping")
    } else {
        print("Not overlapping")
    }

唯一的问题是，只有当PurpleView位于部分正方形的左上角时，它才会返回True.下面的位置返回FALSE:

(如果与任何绿色重叠，则返回TRUE，否则返回FALSE.我只画了正方形的3条边，并故意将填充物留空)

以下是自定义视图的代码

class CustomView : UIView {

private var _path : UIBezierPath!
public let shapeLayer = CAShapeLayer()

override init(frame: CGRect) {
    super.init(frame: frame)
    self._setup()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    self._setup()
}

private func _setup() {
    self._createSquare()
}

private func _createSquare() { 
    self._path = UIBezierPath()
    self._path.move(to: CGPoint(x: 0.0, y: 0.0))
    self._path.addLine(to: CGPoint(x: 0.0, y: self.frame.size.height))
    self._path.addLine(to: CGPoint(x: self.frame.size.width, y: self.frame.size.height))
    self._path.addLine(to: CGPoint(x: self.frame.size.width, y: 0.0))
    //self._path.close()
    
    
    
    self.shapeLayer.path = self._path.cgPath
    self.shapeLayer.lineWidth = 10
    self.shapeLayer.strokeColor = UIColor.green.cgColor 
    self.backgroundColor = UIColor.green
    self.shapeLayer.fillColor = nil 
    self.layer.mask = self.shapeLayer   
}
}

有没有办法实现这一点？我意识到使用Frame.intersects()函数可能不是正确的方法.