在不使用多个addLine的情况下在2个CGPoint之间绘制直线

import UIKit

func drawLine(from startPoint: CGPoint, to endPoint: CGPoint) -> CAShapeLayer {
    let path = UIBezierPath()
    path.move(to: startPoint)
    path.addLine(to: endPoint)
    
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.cgPath
    shapeLayer.strokeColor = UIColor.black.cgColor
    shapeLayer.lineWidth = 1.0
    
    return shapeLayer
}

// 调用示例
let startPoint = CGPoint(x: 50, y: 100)
let endPoint = CGPoint(x: 200, y: 100)

let lineLayer = drawLine(from: startPoint, to: endPoint)
// 将lineLayer添加到需要显示直线的视图上