I am building an iOS 8 app (iOS 7 and below not supported).
Is there a standard procedure to "turn down" a user with a legacy version of iOS? (E.g. Use a modal with some text, and then automatically shut down the app after 5 seconds.)
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According to Apple's docs on that, you can restrict it to iOS7 just by requiring a feature that needs iOS7. No needs to implement any special UX flow, since the store gives you ability to restrict the download to compatibile devices.