Question: I'm using Swift to write an app now, In page A, I have a red button, it will switch to another view page(page B) and

I'm using Swift to write an app now,

In page A, I have a red button, it will switch to another view page(page B) and change the background color of the button to green once pressed, but I want it to keep green after I switch back to this page. How can I do that?

Thank you for helping me out.

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