如何在调整视图大小时修复CoreGraphics虚线更改

import UIKit

class DashedLineView: UIView {
    private var shapeLayer: CAShapeLayer!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupDashedLine()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setupDashedLine()
    }
    
    private func setupDashedLine() {
        shapeLayer = CAShapeLayer()
        shapeLayer.strokeColor = UIColor.red.cgColor
        shapeLayer.lineWidth = 2
        shapeLayer.lineDashPattern = [4, 2] // 虚线的长度和间隔
        layer.addSublayer(shapeLayer)
        
        // 监听视图大小的变化
        addObserver(self, forKeyPath: "bounds", options: .new, context: nil)
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        // 更新虚线的路径
        let path = UIBezierPath()
        path.move(to: CGPoint(x: bounds.minX, y: bounds.midY))
        path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.midY))
        shapeLayer.path = path.cgPath
    }
    
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        // 重新绘制虚线
        shapeLayer.setNeedsDisplay()
    }
    
    deinit {
        // 移除监听
        removeObserver(self, forKeyPath: "bounds")
    }
    
    // 监听视图大小的变化回调
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "bounds" {
            setNeedsLayout()
        }
    }
}