如何在另一个透明的uiimage之上或之下遮罩uiimage？

// 创建遮罩图像
let maskImage = UIImage(named: "mask_image") // 替换为你的遮罩图像名称

// 创建要遮罩的原始图像
let originalImage = UIImage(named: "original_image") // 替换为你的原始图像名称

// 将遮罩应用于原始图像
let maskedImage = originalImage.masked(with: maskImage)

// 显示遮罩后的图像
imageView.image = maskedImage

extension UIImage {
    func masked(with maskImage: UIImage?) -> UIImage? {
        guard let maskRef = maskImage?.cgImage else {
            return nil
        }
        
        guard let originalMask = CGImage(maskWidth: maskRef.width,
                                         height: maskRef.height,
                                         bitsPerComponent: maskRef.bitsPerComponent,
                                         bitsPerPixel: maskRef.bitsPerPixel,
                                         bytesPerRow: maskRef.bytesPerRow,
                                         provider: maskRef.dataProvider!,
                                         decode: nil,
                                         shouldInterpolate: true) else {
            return nil
        }
        
        guard let maskedRef = cgImage?.masking(originalMask) else {
            return nil
        }
        
        return UIImage(cgImage: maskedRef)
    }
}