SwiftUI技术问题：如何创建包含UIImage与AVPlayer的数组？

当然可以使用对象数组，以下是几种具体实现思路：

思路一：Any类型数组（快速原型方案） #

直接声明数组类型为[Any]，可直接存入UIImage和AVPlayer实例，但编译期无类型校验，适合快速验证需求：

let mixedMedia: [Any] = [UIImage(named: "demo")!, AVPlayer(url: URL(string: "demo.mp4")!)]

for item in mixedMedia {
    if let image = item as? UIImage {
        // 显示图片：实例化UIImageView并添加到视图
        let imageView = UIImageView(image: image)
        imageView.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
        // 自行添加到父视图逻辑
    } else if let player = item as? AVPlayer {
        // 显示视频：实例化AVPlayerLayer并添加到视图层
        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
        // 自行添加到父视图层逻辑
        player.play()
    }
}

思路二：自定义枚举数组（类型安全推荐方案） #

定义枚举关联对应媒体类型，数组类型明确，编译期可校验类型，代码可读性更高：

enum MediaItem {
    case image(UIImage)
    case video(AVPlayer)
}

let mediaList: [MediaItem] = [
    .image(UIImage(named: "demo")!),
    .video(AVPlayer(url: URL(string: "demo.mp4")!))
]

for media in mediaList {
    switch media {
    case .image(let image):
        // 处理图片显示逻辑
        let imageView = UIImageView(image: image)
        imageView.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
    case .video(let player):
        // 处理视频显示逻辑
        let playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = CGRect(x: 0, y: 0, width: 300, height: 200)
        player.play()
    }
}

思路三：协议扩展数组（高扩展性方案） #

定义统一协议，让UIImage和AVPlayer遵循并实现显示逻辑，后续新增媒体类型只需扩展协议即可：

protocol MediaDisplayable {
    func show(in container: UIView)
}

// 扩展UIImage遵循协议
extension UIImage: MediaDisplayable {
    func show(in container: UIView) {
        let imageView = UIImageView(image: self)
        imageView.frame = container.bounds
        container.addSubview(imageView)
    }
}

// 扩展AVPlayer遵循协议
extension AVPlayer: MediaDisplayable {
    func show(in container: UIView) {
        let playerLayer = AVPlayerLayer(player: self)
        playerLayer.frame = container.bounds
        container.layer.addSublayer(playerLayer)
        self.play()
    }
}

// 使用协议类型数组
let mediaArray: [MediaDisplayable] = [UIImage(named: "demo")!, AVPlayer(url: URL(string: "demo.mp4")!)]

let container = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 200))
for media in mediaArray {
    media.show(in: container)
}

内容的提问来源于stack exchange，提问作者Nick