iOS Autolayout - constraints modifications lost on orientation change?

Question

If I modify my constraints (lets say activate some and deactivate others) and then rotate to a different orientation my interface snaps back to the original unmodified state. How do I preserve this changes?

Answer 1

Are your constraints 'properties of the class'? Or they are local variables of a function which get deallocated after you change your orientation?

The general suggestion is to keep a reference/pointer to your constraints and instead of adding/removing constraints you activate/deactivate the constraints. See this moment of wwdc: Mysteries of Auto Layout, Part 1