如何在Swift中平滑UIBezierPath

import UIKit

func createSmoothPath() -> UIBezierPath {
    let path = UIBezierPath()
    
    // 添加起始点
    path.move(to: CGPoint(x: 50, y: 100))
    
    // 添加曲线段
    path.addCurve(to: CGPoint(x: 250, y: 100),
                  controlPoint1: CGPoint(x: 150, y: 0),
                  controlPoint2: CGPoint(x: 150, y: 200))
    
    // 设置线宽和颜色
    path.lineWidth = 2.0
    UIColor.black.setStroke()
    
    return path
}

// 在UIView的draw(_:)方法中使用平滑UIBezierPath
class CustomView: UIView {
    override func draw(_ rect: CGRect) {
        let smoothPath = createSmoothPath()
        smoothPath.stroke()
    }
}

// 在UIViewController中使用CustomView
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let customView = CustomView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
        view.addSubview(customView)
    }
}