Approach for UserDefaults supported types but AppStorageKey not supported

[myihsan]

For values that I control, I have defined a wrapper to handle them.
However, I want to retrieve a string array value set by set(_ value: Any?, forKey defaultName: String) that can only be retrieved by stringArray(forKey:) or object(forKey:) as far as I know.
So I created #56, which is closed due to the current stance, which also makes sense.

But how do we deal with these types?
It would be helpful to make the relative APIs @SPI public so we can extend AppStorageKey when we need to.

[mbrandonw]

Hi @myihsan, is there a reason you cannot use .fileStorage for more complex data types?

[mbrandonw]

For example, sync the language setting (a string array saved in UserDefaults) with Settings.app

Can you explain this a bit more? What key are you wanting to modify in user defaults?

[myihsan]

The key is AppleLanguages.
I understand this is not a normal need😅

[mbrandonw]

I'm not sure it's legitimate to change that key in user defaults. See this.

[myihsan]

I know. I only use it to sync the language setting with Settings.app and switch language by Environment since there is a requirement to do it without relaunching the app.

So it would be great to have the ability to extend AppStorageKey even by @SPI public.

[myihsan]

https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/UserDefaults/AboutPreferenceDomains/AboutPreferenceDomains.html

If you want to change the value of a preference in the global domain, write that same preference to the application domain with the new value.

According to this document, it seems legitimate for my use.