1

On iOS 16 we can use URL.cachesDirectory to get a non optional URL to the cache files directory for the current user.

Pre iOS 16 we would need to do something like:

let url = FileManager.default.urls(
  for: .cachesDirectory, 
  in: .userDomainMask
)[0] // <- Is this safe?

My assumption has always been that that is safe on iOS. i.e. There will be at least 1 URL returned from NSFileManager.urls(for:in:).

But recently I've started working on a project which doesn't make that assumption. I cannot find this documented anywhere so thought here would be the best place to ask.

Thank you!

2

This is not exactly about Swift.

Details

It's probably premature "what if" thinking on their behalf. I'd make this assumption that's there's exactly one cache directory (via precondition(folders.count == 1)). Once this crashes (if ever!) I'd be among the first ones to know the actual truth :slight_smile:

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