文件“xxx.mp4”无法打开，因为您无权查看它

我使用阿拉莫菲尔方法multipartFormData.append(URL, withName: "file")将视频上传到服务器，但我收到一条错误消息：

multipartEncodingFailed(Alamofire.AFError.MultipartEncodingFailureReason.bodyPartFileNotReachableWithError(file:///var/mobile/Media/DCIM/100APPLE/IMG_0939.mp4，错误域=NSCocoaErrorDomain代码=257“文件“IMG_0939.mp4”无法打开，因为您没有查看它的权限。“ UserInfo={NSURL=file:///var/mobile/Media/DCIM/100APPLE/IMG_0939.mp4，NSFilePath=/var/mobile/Media/DCIM/100APPLE/IMG_0939.mp4，NSUnderlyingError=0x174450d10 {错误域=NSPOSIXErrorDomain代码=1“不允许操作”}}))

我已经打开了隐私 - 照片库使用说明，但出现此错误，我不知道。

My code:

alamofireManager?.upload(
    multipartFormData: { multipartFormData in
        for i in 0..<videoURLs.count {
            multipartFormData.append(videoURLs[i], withName: "file")
        }
    },
    to: url + urlString,
    headers: headers,
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload.uploadProgress(closure: { (progress) in


                //Print progress
                //print(progress)
            })

            upload.responseJSON { response in
                if let value = response.result.value as? [String: AnyObject]{
                    success(value)
                }
            }
        case .failure(let encodingError):
            failture(encodingError)
        }
    }
)

你需要使用开始访问SecurityScopedResource

if let url = file.url, url.startAccessingSecurityScopedResource() {
    multipartFormData.append(url, withName: "some-file.pdf")
    // After using the resource make sure you stop the access
    if url.startAccessingSecurityScopedResource() {
        url.stopAccessingSecurityScopedResource()
    }
}