Change language in app with using String Catalog

What button are you referring to?

You can redirect users to your app’s settings to change the app language
https://developer.apple.com/documentation/uikit/uiapplication/1623042-opensettingsurlstring

If you need to change the language for development purposes or testing, you can change the language in the scheme options or test plan configuration.

I hope you understand my bad English. Our app will support Korean and English. In addition to showing the language of the app in the user's preferred language, I want to support changing the app's language from within my app. So I'll include a language change button in the settings screen of my app. And I'm using String catalog to localize the app. What should I do in this case? The only thing I can find on the internet is how to implement a language change button using an older version. If I use string catalog and create an old version of the language change button, will it be reflected?

I want to support changing the app's language from within my app.

This generally doesn’t end well. See this post. Bouncing out to Settings per tomn94’s suggestion is a much better option.

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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Can anyone find a solution for this question? Using String catalog makes it much easier to localize your app, as it provides real-time feedback, etc. However, how can the app's language be changed inside the app? Is that possible? Currently, I can achieve this by localizing my app with a Legacy string file, but how can this be done with String catalog?