AVPlayer是iOS系统中常用的一个音视频播放器框架，它可以用来播放本地和网络上的音视频文件。在AVPlayer中，播放网络上的音视频文件需要使用URL来加载和播放，只需要将远程文件的URL传递给AVPlayer对象即可。
在AVPlayer中实现WiFi传输有以下几种方式：
1. 使用NSURLConnection下载文件
```swift
let url = URL(string: "http://example.com/path/to/file.mp4")
let request = URLRequest(url: url!)
let connection = NSURLConnection(request: request, delegate: self)
connection?.start()
```
然后在接收到数据时使用AVPlayer加载并播放
```swift
func connection(_ connection: NSURLConnection, didReceive data: Data) {
player = AVPlayer(playerItem: AVPlayerItem(url: url))
player.play()
}
```
2. 使用NSURLSession下载文件
```swift
let url = URL(string: "http://example.com/path/to/file.mp4")
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url!)
task.resume()
```
然后在下载完成时把文件保存下来，并使用AVPlayer加载并播放
```swift
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
let destinationURL = // ...
try? FileManager.default.moveItem(at: location, to: destinationURL)
player = AVPlayer(playerItem: AVPlayerItem(url: destinationURL))
player.play()
}
```
3. 使用第三方库Alamofire下载文件
```swift
let url = "http://example.com/path/to/file.mp4"
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let destinationURL = URL(fileURLWithPath: documentsPath).appendingPathComponent("/path/to/file.mp4")
return (destinationURL, [.removePreviousFile, .createIntermediateDirectories])
}
Alamofire.download(url, to: destination).response { response in
if let destinationURL = response.destinationURL {
self.player = AVPlayer(playerItem: AVPlayerItem(url: destinationURL))
self.player.play()
}
}
```
在使用Alamofire下载文件时，需要注意下载完成后保存文件的路径和名称，并将其传递给AVPlayer。
以上是几种在AVPlayer中实现WiFi传输的方式，根据具体的需求和项目要求选择适合的方式进行实现即可。
