如何在Swift中使用合并图像制作动画？

import UIKit

func mergeImages(images: [UIImage]) -> UIImage? {
    // 创建一个新的图形上下文
    UIGraphicsBeginImageContextWithOptions(images[0].size, false, 0.0)
    
    // 将每个图像绘制到上下文中
    for image in images {
        image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
    }
    
    // 从上下文中提取合并后的图像
    let mergedImage = UIGraphicsGetImageFromCurrentImageContext()
    
    // 结束图形上下文
    UIGraphicsEndImageContext()
    
    return mergedImage
}

// 准备要合并的图像资源
let image1 = UIImage(named: "image1.png")!
let image2 = UIImage(named: "image2.png")!
let image3 = UIImage(named: "image3.png")!

// 合并图像
let mergedImage = mergeImages(images: [image1, image2, image3])

// 创建一个UIImageView来显示合并后的图像
let imageView = UIImageView(image: mergedImage)
imageView.frame = CGRect(x: 0, y: 0, width: mergedImage?.size.width ?? 0, height: mergedImage?.size.height ?? 0)

// 添加动画效果
UIView.animate(withDuration: 1.0, delay: 0.0, options: [.repeat, .autoreverse], animations: {
    imageView.alpha = 0.0
}, completion: nil)

// 将UIImageView添加到视图中显示
view.addSubview(imageView)