iOS Question Position of a view after application_foreground

Hello,

I am probably missing something little but while in the app, I change the top position of a view with a button, when I come back to app, the view's top position is not the position which I have changed with a button but the original top position. I don't have anything in foreground or resize sub to change the position when I come back to app.

What may I be missing ?

Thanks