How to disable 4 finger gestures on iPad?

Question

I\'m testing an iPad on iOS 4.3, which by default uses 4 finger (up/down) gestures to switch out of apps. This interferes with an on-screen piano keyboard I\'m using, howev

Answer 1

One way to detect this is you will get 4 touchesCancelled at once in a single (NSSet *)touches event if the person accidentally did the 4 finger swipe, and 5 touchesCancelled if the person did the 5 finger grab.

At that point you can display a dialog box in your app, telling the user how to turn off the multitasking gestures, once he switches back to the app.