在可缩放的UIView中保留CAShapeLayer的lineWidth

import UIKit

class ScalableShapeView: UIView {
    private var shapeLayer: CAShapeLayer!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    
    private func setup() {
        shapeLayer = CAShapeLayer()
        shapeLayer.lineWidth = 2.0 // 设置线宽
        
        let path = UIBezierPath(rect: bounds) // 创建一个矩形路径
        shapeLayer.path = path.cgPath
        
        layer.addSublayer(shapeLayer)
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        // 更新CAShapeLayer的路径，以适应UIView的缩放
        let path = UIBezierPath(rect: bounds)
        shapeLayer.path = path.cgPath
    }
}