从CGPoints数组创建CGContext

// 导入Core Graphics框架
import CoreGraphics

// 定义一组CGPoint坐标数据
let points: [CGPoint] = [
    CGPoint(x: 100, y: 100),
    CGPoint(x: 200, y: 100),
    CGPoint(x: 200, y: 200),
    CGPoint(x: 100, y: 200)
]

// 创建一个图像上下文
let size = CGSize(width: 300, height: 300)
let scale = UIScreen.main.scale
let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
guard let context = CGContext(data: nil, width: Int(size.width * scale), height: Int(size.height * scale), bitsPerComponent: 8, bytesPerRow: 0, space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: bitmapInfo.rawValue) else {
    fatalError("Failed to create CGContext")
}

// 将坐标系进行缩放，以适应图像上下文的尺寸
context.scaleBy(x: scale, y: scale)

// 创建一个路径，并将CGPoint坐标数据添加到路径中
context.addLines(between: points)

// 设置绘制属性，比如线宽、颜色等
context.setStrokeColor(UIColor.red.cgColor)
context.setLineWidth(2)

// 绘制路径
context.strokePath()

// 释放上下文对象
context.release()