Prevent iOS from taking screen capture of app before going into background

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You are on the right track. This is Apple’s recommended way to do this as noted in the iOS Application Programming Guide:

Remove sensitive information from views before moving to the background. When an application transitions to the background, the system takes a snapshot of the application’s main window, which it then presents briefly when transitioning your application back to the foreground. Before returning from your applicationDidEnterBackground: method, you should hide or obscure passwords and other sensitive personal information that might be captured as part of the snapshot.

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