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Showing and hiding subviews in a xib (obj-c xcode)

I have an app with some buttons and multiple pages: each page is a XIB with a PNG and some buttons. The button actions to call up the other pages are coded into the UISubview Controllers for each of those XIBs. Now I need to add buttons to those XIBs that will pop up overlaying imageviews. How do I execute this? I think I need to programmatically show/hide the "subviews" in each xib. Is that correct?

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