How to get an ALAsset URL from a PHAsset?

Question

You can do it sneakily† using the undocumented PHAsset.ALAssetURL property, but I\'m looking for something documented.

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† In Objective-C, this will

Answer 1

I wanted to be able to get a URL for an asset too. However, I have realised that the localIdentifier can be persisted instead and used to recover the PHAsset.

PHAsset* asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[localIdentifier] options:nil].firstObject;

Legacy asset URLs can be converted using:

PHAsset* legacyAsset = [PHAsset fetchAssetsWithALAssetUrls:@[assetUrl] options:nil].firstObject;
NSString* convertedIdentifier = legacyAsset.localIdentifier;

(before that method gets obsoleted...)

(Thanks holtmann - localIdentifier is hidden away in PHObject.)