Retrieving Video Asset After Saving it to Gallery

Question

I am trying to save a video to Gallery and after that retrieving the asset, in ios 12 it worked fine, now testing it in ios 13 is not working anymore. The video is correctly saved, but the asset retrieved is not the correct one, instead, it is another from the library.

PHPhotoLibrary.shared().performChanges({
    PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: filePath)
}) { completed, error in
    if completed {
        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

        let fetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions).lastObject
        GeneralUtils().shareVideoFacebook(fetchResult!, self)
    }

}

Creation date is not the way to do this. If you wanted to access the asset after creation, you should not have thrown away the result of the creation request. — matt, Nov 08 '19 at 16:12
Also the video is presumably still at the file url so why bother fetching it from the library when you still have it in your hands? — matt, Nov 08 '19 at 16:14
The problem is that FBSDK wants an Asset URL to share the video, I have the video at an internal directory — David Vittori, Nov 08 '19 at 16:17

score 0 · Answer 1 · edited Nov 08 '19 at 16:49

0

I just found the solution to this problem. You can ask for a local identifier of the saved image.

var id: String?
PHPhotoLibrary.shared().performChanges({
    let collection = PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: filePath)
    id = collection?.placeholderForCreatedAsset?.localIdentifier
}) { completed, error in
    if completed {
        let fetchResult = PHAsset.fetchAssets(withLocalIdentifiers: [id!], options: .none).firstObject
        GeneralUtils().shareVideoFacebook(fetchResult!, self)
    }                        
}

edited Nov 08 '19 at 16:49

rmaddy

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answered Nov 08 '19 at 16:10

David Vittori

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Yes that’s what I said. The create request returns a value but you were throwing it away. – matt Nov 08 '19 at 18:16

score 0 · Answer 2 · edited Mar 24 '22 at 18:54

   DispatchQueue.global(qos: .background).async {
        if let url = URL(string: url),
           let urlData = NSData(contentsOf: url)
        { let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
            let filePath="\(documentsPath)/file.mp4"
            DispatchQueue.main.async {
                urlData.write(toFile: filePath, atomically: true)
                PHPhotoLibrary.shared().performChanges({
            self.instagramVideoId =  PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: URL(fileURLWithPath: filePath))?.placeholderForCreatedAsset?.localIdentifier
                }) { completed, _ in
                    if completed {
                        let url = URL(string: "instagram://library?LocalIdentifier=\(self.instagramVideoId!)")!
                        DispatchQueue.main.async {
                            if UIApplication.shared.canOpenURL(url) {
                                UIApplication.shared.open(url)
                            } else {
                            }
                        }
                    }
                }
            }
        }
        self.hideLoader()
    }

Retrieving Video Asset After Saving it to Gallery

2 Answers2