Snapshot for Mac Catalyst [possible solution]

[huven]

It looks like snapshot currently does not support Mac Catalyst. Research shows several others have tried this with little to no success, please reply if you did succeed!

After some testing I found that snapshot uses the "~/Library/Caches/tools.fastlane" directory to communicate with the UI Tests target. And this causes the issue since the UI Tests Runner is sandboxed.

So, I made some changes which make the process work for me:

• changed SnapshotHelper.swift to set SIMULATOR_DEVICE_NAME env variable to 'Mac' for Mac Catalyst since the rest of the existing code assumes its existence
• changed SnapshotHelper.swift to use ~/Library/Caches/tools.fastlane as CacheDirectory
• since this is a directory outside the sandbox, I also added a .entitlements file to the UI Tests framework allowing access to this directory
• changed SnapshotHelper.swift to use the app window instead of the main screen to create the snapshot
• added some code to the app's scene delegate that resizes the main window to 1280x800 (if run within snapshot) to accommodate the App Store requirement

For me, this setup works, I now get perfect screenshots suitable for upload to the App Store.

Really interested in feedback from the community, is this the right way? Another approach is changing snapshot to use a folder inside UI Tests sandbox, though I'm not sure how to predict its location reliably.

If there is enough support for the approach outlined above, I could turn it into a PR.

[donaldpiret]

A PR would be a lifesaver for me for this!