QLPreviewController and iOS 3

Question

Can I use QLPreviewController on a device with iOS 3 ?

Answer 1

No this class is only available in iOS 4.0 or higher: http://developer.apple.com/library/iOS/#documentation/NetworkingInternet/Reference/QLPreviewController_Class/Reference/Reference.html

Answer 2

If you go to the documentation, you can see that it is IOS>=4.