如何为 iPhone 应用程序制作铅笔描边？

import UIKit

class PencilStrokeView: UIView {
    override func draw(_ rect: CGRect) {
        super.draw(rect)
        
        guard let context = UIGraphicsGetCurrentContext() else { return }
        
        // 设置绘制属性
        context.setStrokeColor(UIColor.black.cgColor)
        context.setLineWidth(2.0)
        context.setLineCap(.round)
        
        // 创建路径并绘制
        let path = UIBezierPath()
        path.move(to: CGPoint(x: 50, y: 50))
        path.addLine(to: CGPoint(x: 200, y: 200))
        path.addLine(to: CGPoint(x: 50, y: 200))
        path.close()
        
        // 绘制描边
        context.addPath(path.cgPath)
        context.strokePath()
    }
}