如何缩放蒙版uiimage？

import UIKit

func scaleMaskedImage(image: UIImage, scale: CGFloat) -> UIImage? {
    // 创建UIImageView对象
    let imageView = UIImageView(image: image)
    
    // 创建CAShapeLayer对象
    let maskLayer = CAShapeLayer()
    
    // 创建UIBezierPath对象
    let path = UIBezierPath(rect: CGRect(x: 0, y: 0, width: image.size.width * scale, height: image.size.height * scale))
    
    // 设置CAShapeLayer对象的路径
    maskLayer.path = path.cgPath
    
    // 将CAShapeLayer对象设置为UIImageView对象的蒙版图层
    imageView.layer.mask = maskLayer
    
    // 创建CGAffineTransform对象
    let transform = CGAffineTransform(scaleX: scale, y: scale)
    
    // 设置UIImageView对象的变换属性
    imageView.transform = transform
    
    // 生成缩放后的图像
    UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
    imageView.layer.render(in: UIGraphicsGetCurrentContext()!)
    let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    
    return scaledImage
}

// 使用示例
let originalImage = UIImage(named: "originalImage")
let scaledImage = scaleMaskedImage(image: originalImage, scale: 0.5)