如何在Swift 5.0中通过CAShapeLayer开始和结束带点的直线

import QuartzCore

let startPoint = CGPoint(x: 50, y: 100)
let endPoint = CGPoint(x: 250, y: 100)

let path = UIBezierPath()
path.move(to: startPoint)
path.addLine(to: endPoint)

let shapeLayer = CAShapeLayer()
shapeLayer.path = path.cgPath

shapeLayer.strokeStart = 0.0
shapeLayer.strokeEnd = 1.0

view.layer.addSublayer(shapeLayer)

import UIKit
import QuartzCore

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let startPoint = CGPoint(x: 50, y: 100)
        let endPoint = CGPoint(x: 250, y: 100)
        
        let path = UIBezierPath()
        path.move(to: startPoint)
        path.addLine(to: endPoint)
        
        let shapeLayer = CAShapeLayer()
        shapeLayer.path = path.cgPath
        shapeLayer.strokeStart = 0.0
        shapeLayer.strokeEnd = 1.0
        
        view.layer.addSublayer(shapeLayer)
    }
}