New in iOS 8: Improved Guided Access with Timers and Touch ID Integration

Guided Access is one of the many iOS features being enhanced in iOS 8. Guided Access
is used to keep a someone on a single app using  a password. For
example, if you want your child to read a book and not watch a video you
can lock them into the reading app, eliminating the ability to navigate
to other apps. With Guided Access enabled, a child or student will need a passcode in order to enter another app. To learn more about Guided Access click here.

One of the enhancement allows users to end a Guided Access session with
their finger print using Touch ID. Similar to how third-party developers
can implement Touch ID authentication, Guided Access will also take advantage of finger print reading technology. Instead of entering a passcode, users with a Touch ID
enabled device will be able to end the session simply by placing their
finger on the Touch ID sensor. This feature will simplify the processes
of ending Guided Access and potentially eliminate the frustration
resulting in forgotten passcodes.

The other enhancement allows students and parents to set a time limit.
After the time expires the app will not respond until the correct
passcode or finger print is entered. Periodically a small message
appears showing how much time is remaining. This feature could be
perfect for test taking by ensuring students stop answering questions
after the allotted time expires, or for setting a time limit for playing
games- when the time limit is reached, the app will not respond.

To enable Guided Access navigate to Settings > General > Accessibility > Guided Access.