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Asked: 2026-05-20T11:58:44+00:00

I have UITabBarController, containing 2 screens – A,B. I also have a strings array

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I have UITabBarController, containing 2 screens – A,B.
I also have a strings array – strArr in my application delegate (this array is a global variable).

Screen A changes strArr.
Screen B contains UIPickerView that displays the values from strArr.

The problem:
When I see screen B, I can see the updated values from the strArr array in the picker. BUT, after I’m changing the values of strArr in Screen A, switching to screen B and watching the spinner, I still see the old values, and the app crashes when I’m selecting non-existing anymore item from the picker…

The question (You’ve probably already know what I’m about to ask..):
How can I display the updated values in the picker that located on screen B?

Thanks all.

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1 Answer

  1. Editorial Team

    If part of your data model changes and the rest of your app needs to know about it, you can use Key-Value Observing or notifications.

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