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I need to resignFirstResponder() on a text field when the user taps the back button in the navigation bar of the navigation controller, otherwise I get some error. The back button works as it should (the previous view gets shown) but I don't know where to do resign first responder. It's too late if I do it in viewWillDisappear() (I tried), and prepareForSegue() doesn't get called, so I need to somehow do it as soon as the back button gets tapped or at least before viewWillDisappear(). How do I detect that event?

TimSim
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    It question was in stackoverflow - [answer](http://stackoverflow.com/questions/8228411/detecting-when-the-back-button-is-pressed-on-a-navbar) answer – Savchenko Dmitry Jun 16 '16 at 23:18

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Note: See first comment on question for simpler answer

You could combine NotificationCenterand this post: Execute action when back bar button of UINavigationController is pressed to make a custom back button (that looks the same). Just post a Notification in the action for the back button, and add an observer for the Notification on the textfield whose action calls resignFirstResponder. You would also need to make an image or draw an image in CoreGraphics for the arrow.

Community
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Ike10
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