用AlamoFire会话pipe理器下载调用时不正确的参数标签

AlamoFire的文档：

let destination: DownloadRequest.DownloadFileDestination = { _, _ in let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] let fileURL = documentsURL.appendingPathComponent("pig.png") return (fileURL, [.removePreviousFile, .createIntermediateDirectories]) } 

我的代码：

  fileprivate let manager: Alamofire.SessionManager = { ... let destination: DownloadRequest.DownloadFileDestination = { _, _ in let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] let fileURL = documentsURL.appendingPathComponent(".mp4") return (fileURL, [.removePreviousFile, .createIntermediateDirectories]) } 

…

  self.manager.download(urlString, to: destination) { response in 

编译错误：

Answer 1

你所要做的就是更新方法。 您可以尝试自动填充，但不可靠。 我的猜测是方法是这种方法（默认为GET）：

 self.manager.download(urlString, to: destination).response { (response) in print(response) }