不正確的參數標籤下載

Question

AlamoFire的文檔：

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]) 
} 

我的代碼：

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 

編譯錯誤：

Answer 1

所有你需要做的是更新的方法。您可以嘗試自動填充，但其不可靠的。我的猜測是該方法是這樣的方法（以獲得其默認值）：

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