swift - 错误域=NSCocoaErrorDomain 代码=257 无法打开 fil ""- Firebase

Question

所以我通过自定义 UICollectionView 访问用户的视频和照片，我的问题是当我尝试通过手机将视频上传到 firebase 时，出现此错误:

2017-09-03 13:09:20.884509-0400 Project[5797:2021536] Cannot get file size: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x17064f450 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}
  /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
2017-09-03 13:09:21.261767-0400 Project[5797:2021536] Body file is unreachable: /var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4
  Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_3476.MP4” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSFilePath=/var/mobile/Media/DCIM/103APPLE/IMG_3476.MP4, NSUnderlyingError=0x170651b20 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

这里是我加载文件的地方

struct Media {
    var image:UIImage?
    var videoURL:NSURL?
}

var mediaArray = [Media]()

func grabPhotos(){
    let imgManager = PHImageManager.default()

    let requestOptions = PHImageRequestOptions()
    requestOptions.isSynchronous = true
    requestOptions.deliveryMode = .highQualityFormat

    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    if let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions) {


        if fetchResult.count > 0 {
            for i in 0..<fetchResult.count{
                var mediaItem = Media()
                //Used for fetch Image//
                imgManager.requestImage(for: fetchResult.object(at: i) as PHAsset , targetSize: CGSize(width: 400, height: 400), contentMode: .aspectFit, options: requestOptions, resultHandler: {
                    image, error in
                    let imageOfVideo = image! as UIImage
                    mediaItem.image = imageOfVideo;
                    //Used for fetch Video//
                    imgManager.requestAVAsset(forVideo: fetchResult.object(at: i) as PHAsset, options: PHVideoRequestOptions(), resultHandler: {(avAsset, audioMix, info) -> Void in
                        if let asset = avAsset as? AVURLAsset {
                            let videoData = NSURL(string: "\(asset.url)")
                            let duration : CMTime = asset.duration
                            let durationInSecond = CMTimeGetSeconds(duration)
                            print(durationInSecond)
                            mediaItem.videoURL = videoData!
                            self.mediaArray.append(mediaItem)
                            print(self.mediaArray.count)


                        }

                    })
                })
            }

        }
        else{
            //showAllertToImportImage()//A function to show alert
        }
    }
}

我认为这与我上传视频无关，因为我可以录制视频并从手机上传，而不是从手机本身上传；我只是像这样将 url 转移到 nextVC:

let videoVC = PrepareVideoVC()
        videoVC.url = outputFileURL as URL!
        self.navigationController?.pushViewController(videoVC, animated: false)

我调查了这个The file “ ” couldn’t be opened because you don’t have permission to view it但无法真正弄清楚如何实现它

我也遇到了https://stackoverflow.com/a/41517165/7823620但我又一次尝试实现它，但无法让它不给我错误

我也可以从模拟器上传，但不能从手机上传

它正在尝试从此目录中获取文件:

NSFilePath=/var/mobile/Media/DCIM/

Answer 1

你可以试试

url.startAccessingSecurityScopedResource()
<...>
url.stopAccessingSecurityScopedResource()