Swift:绘制矩形的最快方法

import UIKit

func drawRectangle() {
    // 创建一个图形上下文
    UIGraphicsBeginImageContext(CGSize(width: 200, height: 200))
    guard let context = UIGraphicsGetCurrentContext() else { return }
    
    // 设置矩形的属性
    context.setFillColor(UIColor.red.cgColor)
    context.setStrokeColor(UIColor.blue.cgColor)
    context.setLineWidth(2.0)
    
    // 绘制矩形
    let rectangle = CGRect(x: 50, y: 50, width: 100, height: 100)
    context.addRect(rectangle)
    context.drawPath(using: .fillStroke)
    
    // 获取绘制的图形
    guard let image = UIGraphicsGetImageFromCurrentImageContext() else { return }
    
    // 结束图形上下文
    UIGraphicsEndImageContext()
    
    // 在界面上显示绘制的图形
    let imageView = UIImageView(image: image)
    imageView.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
    imageView.contentMode = .scaleAspectFit
    
    // 添加到视图中
    let viewController = UIViewController()
    viewController.view.addSubview(imageView)
}

drawRectangle()