Get URL of a newly created asset, iOS 9 style - ios

Question

ALAssetsLibrary is deprecated these days but practically all examples on SO are still making use of it. For my objective, I need to know the URL of the video that was added to the Photo Library so I could share a video to the Instagram app (that's the only way in which Instagram accepts videos). The URL should probably start with "assets-library://..."
This is simple with ALAssetsLibrary:
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeVideoAtPathToSavedPhotosAlbum:videoFilePath completionBlock:^(NSURL *assetURL, NSError *error) { // ...
Above, the URL is passed as an argument to the completion block. But what about iOS 9 compatible way with PHPhotoLibrary class and performChanges method?
var videoAssetPlaceholder:PHObjectPlaceholder! // property
// ...
let videoURL = NSBundle.mainBundle().URLForResource("Video_.mp4", withExtension: nil)!
let photoLibrary = PHPhotoLibrary.sharedPhotoLibrary()
photoLibrary.performChanges({
let request = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
self.videoAssetPlaceholder = request?.placeholderForCreatedAsset
},
completionHandler: { success, error in
if success
{
// The URL of the video asset?
}
})

Answer 1

Here's what I've ended up with:
let videoURL = NSBundle.mainBundle().URLForResource("Video_.mp4", withExtension: nil)!
let photoLibrary = PHPhotoLibrary.sharedPhotoLibrary()
var videoAssetPlaceholder:PHObjectPlaceholder!
photoLibrary.performChanges({
let request = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
videoAssetPlaceholder = request!.placeholderForCreatedAsset
},
completionHandler: { success, error in
if success {
let localID = videoAssetPlaceholder.localIdentifier
let assetID =
localID.stringByReplacingOccurrencesOfString(
"/.*", withString: "",
options: NSStringCompareOptions.RegularExpressionSearch, range: nil)
let ext = "mp4"
let assetURLStr =
"assets-library://asset/asset.\(ext)?id=\(assetID)&ext=\(ext)"
// Do something with assetURLStr
}
})

Answer 2

Nice answer and pseudo, thanks Desmond.
Here is an updated answer :
Swift 3
var assetPlaceholder: PHObjectPlaceholder!
PHPhotoLibrary.shared().performChanges({
let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoURL as URL!)
assetPlaceholder = assetRequest?.placeholderForCreatedAsset
}, completionHandler: { (success, error) in
if success {
let localID = assetPlaceholder.localIdentifier
let assetID = localID.replacingOccurrences(of: "/.*", with: "", options: NSString.CompareOptions.regularExpression, range: nil)
let ext = "mp4"
let assetURLStr = "assets-library://asset/asset.\(ext)?id=\(assetID)&ext=\(ext)"
// Do what you want with your assetURLStr
} else {
if let errorMessage = error?.localizedDescription {
print(errorMessage)
}
}
})
Going further
Although this works perfectly for the moment, would anyone know a "cleaner" way to get this "assets-library" URL, without this "manual" solution ?
I found this interesting thread, but it only gives a "file:///var/..." URL