iOS7 Safari to swipe to the right from the left edge of the screen in the browser's back function is performed.
(Safari screen)

* Knack is screen start swipe from the left side as much as possible.

And the music app, is this well presented at various sites, but in fact this feature Safari as well as standard apps, notes app, select details from the list, are displayed scenes also work.
(If you screen)

In fact this feature is on iOS7 SDK UINavigationController class standard implementation features. So the app in the app was built using the iOS7 SDK, using the Uinavigationhontroller,(Unless you don't change the touch action)Automatically equipped with this feature.
For example, mail app I have patronized "ibisMail" also responded to iOS7 flat GUI image that this app even swipe back feature is enabled.
(ibisMail screen)

It is expected to swipe back features become effective as well as walking Player is currently developing iOS7 flat GUI image-enabled version is.
(Developing Walking Player screen)

Not just now, a little Walking Player version release has been delayed, but simple, iOS7-friendly flat GUI image corresponds to, has carried out some iOS7/iOS6 common user interface improvements. I think there is value in the continued use of the iOS6 to update. Released until now please wait for a while.