What is the best practice to add validation code on a Back button action in a UIViewController?

Question

I have a UIViewController that is created via instantiateViewControllerWithIdentifier. In that controller, the user may enter some text that I need to validate before saving. There is a back button that the user clicks and that will trigger the save. But if there is an error, I will not allow the user to go back. What is the best practice for this? I read stackoverflow and the solution seems to be overriding UINavigationController, which I think is some sort of hack. I cannot put the code in willMovetoParentViewController since there is no return of true or false. It will still proceed.

You have to create custom back button and set it to the UINavigationBar. — Nirav D, Jun 11 '16 at 11:19

score 0 · Accepted Answer · edited May 23 '17 at 11:52

0

You can just use an extension.

This answer seems to solve your problem.

edited May 23 '17 at 11:52

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answered Jun 11 '16 at 11:22

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Ok I guess Apple has not solved it yet. Your answer works. Thx. – dickyj Jun 11 '16 at 14:46

What is the best practice to add validation code on a Back button action in a UIViewController?

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