使用AlamoFire会话管理器下载调用时参数标签不正确

Question

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

您所要做的就是更新方法。您可以尝试自动填充但不可靠。我的猜测方法是这个方法（默认为GET）：

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