How to make an iOS app support landscape orientation in XCode?

How to make an iOS app support开发者_如何学Go landscape orientation?

How do you make it support both landscape and portrait, where you can just press a button to activate it.

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for any new people reading this old post just go to main.storyboard->click on the view controller click on simulated metrics (the fourth icon that pops up, looks kind of like a pentagon belt buckle) then orientation->Landscape this is for Xcode 5