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
No Dice
This is currently impossible to do programmatically. The most complete thread on it is here:
http://www.cocos2d-iphone.org/forum/topic/28704
and the answer, if it were true, would probably be here (it's not):
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html
Other Possibilities
The other way to go would be at least to inform the user that they have the setting "wrong." Can you detect it? It seems you cannot:
iOS Multitasking gestures: Is there any way to check if the user has them turned on or not?