UIKit UISwipeGestureRecognizer in Xcode crashes app during nib loading?

Question

I've added a UISwipeGestureRecognizer to my Xcode nib and having it there makes my app crash with:

..exception 'NSInvalidArgumentException', reason: '-[UISwipeGestureRecognizer initWithCoder:]: unrecognized selector sent to instance 0x5c2ab30'.

Why?

Answer 1

This is happening because you're running the app on the wrong version of iOS. You can't put gesture recognizers in a xib file on iOS <5, so you'll have to create them in code if you want to support older versions of iOS.