App crash on iOS 5 - Could not instantiate class named NSLayoutConstraint

Question

My app is working very fine on iPhone and Simulator with iOS 6, but when i try to run on iPhone/Simulator with iOS 5 the app crashes

The error is:

Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstraint'

I'm not using Autolayout on Interface Builder Document.

Could anyone help me?

Autolayout is not checked

Answer 1

make sure you have unselected use autolayout in interfacebuild

Answer 2

You've been burned. NSLayoutConstraint only exists on iOS 6. You have to check to see if it's there, and if it's not, you have to do something else.