我正在使用 Alamofire 4 从服务器下载文件但有时 server response doesn't contain header File-Name 我想处理这个错误 . How to catch error response.allHeaderFields["File-Name"] as! String 重写 Error? for completion ？
func download(id: Int, completion: @escaping (_ url: URL?, _ error: Error?) -> Void) {
print(id)
var filePath: URL?
var error: Error? = nil
let destination: DownloadRequest.DownloadFileDestination = { _, response in
let fileName = response.allHeaderFields["File-Name"] as! String
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let documentsURL = URL(fileURLWithPath: documentsPath, isDirectory: true)
let fileURL = documentsURL.appendingPathComponent(fileName)
return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}
Alamofire.download("\(serviceUrl)/\(language)/\(_controller)/DownloadFile", parameters: ["id": id], to: destination).responseData {
response in
switch response.result {
case .success(_):
filePath = response.destinationURL
break
case .failure(let errorData):
error = errorData
break
}
completion(filePath, error)
}
}
我正在使用：
-
斯威夫特4
-
Alamofire 4.6
-
iOS 11