Screen recording directly on iOS devices has usually required the device to be jailbroken. Rather than recording sans-PC, the general solution is to hook up the iPhone/iPad to a computer and use some sort of a mirroring app then record the computer’s display. Now, the app xRec has made its way into the App Store. As you can see in the video above, you do have to deal with a red “xRec” bar at the top of all screens since it is taking advantage of iOS’ recording APIs. On the plus side, you can quickly record the entire operating system on-the-go without plugging into a computer.
Of note, the app currently does not work with iOS 7 and it seemed to crash multiple times on my current-gen iPod Touch. Even after a reboot, opening the Mail app or a game crashed the recording.
The developer assures me iOS 7 compatibility is on the way (after iPad compatibility is built), but stability of the current app would be more appreciated.
xRec is available in the App Store for $1.99.