Xcode : let the user choose the background [closed]

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How do I have to do that the user can choose the background of the app by pressing a UIButton ? By pressing the UIButton it wil

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You may do this as follows. When the user taps the button, presents a new view managed by a table view controller. The table should show on each row a thumbnail representing a possible background, and a text associated to the image, may be its name. When the user selects a row, you first save the choice (using the defaults, your own database or storing it in your core data model) and then change the background accordingly.