如何在swift中为矩形uiview提供虚线边框

class DashedBorderView: UIView {
    
}

class DashedBorderView: UIView {
    private let dashedBorderLayer = CAShapeLayer()
    
    // ...
}

class DashedBorderView: UIView {
    private let dashedBorderLayer = CAShapeLayer()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupDashedBorder()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupDashedBorder()
    }
    
    private func setupDashedBorder() {
        dashedBorderLayer.strokeColor = UIColor.black.cgColor
        dashedBorderLayer.lineWidth = 1
        dashedBorderLayer.lineDashPattern = [4, 4] // 设置虚线样式，4为线段长度，4为间隔长度
        dashedBorderLayer.fillColor = nil
        layer.addSublayer(dashedBorderLayer)
    }
}

class DashedBorderView: UIView {
    private let dashedBorderLayer = CAShapeLayer()
    
    // ...
    
    override func layoutSubviews() {
        super.layoutSubviews()
        dashedBorderLayer.path = UIBezierPath(rect: bounds).cgPath
    }
}

let dashedBorderView = DashedBorderView(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
view.addSubview(dashedBorderView)