Popping ViewController on Swift

Question

I need to pop a UIViewController from the navigation controller.

Just writing this line of code but taking an exception;

unexpectedly found nil while unwrapping an Optional value

self.navigationController.popViewControllerAnimated(true)

If I make the navigation controller optional, this line makes no effect, no popping

self.navigationController?.popViewControllerAnimated(true)

How to solve it?

It seems just too obvious, but are you sure that you access your navigationController correclty? I.e, self.navigationController is not nil? — ullstrm, Aug 20 '14 at 08:55

score 98 · Answer 1 · edited Jul 31 '17 at 12:05

98

You need to unwrap your navigationController correctly

if let navController = self.navigationController {
    navController.popViewController(animated: true)
}

edited Jul 31 '17 at 12:05

FredLoh

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answered Aug 20 '14 at 09:11

karlofk

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28

This basically has the same effect as optional chaining; it works if it's not nil and does nothing if it is. – Aleksi Sjöberg Aug 21 '15 at 06:27
7

This is no different than the question's code in effect. – SafeFastExpressive Feb 27 '18 at 23:42

score 24 · Answer 2 · edited Sep 16 '19 at 22:41

24

Swift 3.0 This is working for me

self.navigationController?.popViewController(animated: true)

edited Sep 16 '19 at 22:41

Marco Weber

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answered Oct 24 '16 at 10:52

Anit Kumar

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5

`_ =` is not needed here – seanscal Apr 19 '17 at 19:46
1

If you are not using return type of variable then you can written like this _ = – Anit Kumar Apr 27 '17 at 18:39

spaceMonkey · Answer 3 · 2017-03-02T05:45:47.817

9

In my case im using a Master Details view ( Split View Controller ). My details view controller is embedded inside an navigation controller. So when i wanted to dismiss my Details view controller. I had to pop it from the navigation controller of the parent (Split view controller) Like this.

_ = self.navigationController?.navigationController?.popViewController(animated: true)

hope this helps someone.

edited Mar 02 '17 at 05:45

answered Jan 24 '17 at 08:46

spaceMonkey

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Yes! I needed to get the navigationController of the navigationController!! – Dale Clifford Mar 13 '18 at 23:10
Wow! Works in the case of split view controller. +1 – Codetard Nov 10 '21 at 05:16

score 6 · Answer 4 · answered Aug 21 '15 at 06:38

It seems that the view controller you're working with isn't embedded in Navigation Controller. If there was a Navigation Controller, i.e. self.navigationController is not nil, both lines should work just as well even though the latter one is preferred as it uses optional chaining.

Make sure you have embedded your View Controller in a Navigation Controller. You can do it by selecting the View Controller in Storyboard editor and clicking Editor -> Embed In -> Navigation Controller. Also make sure that you have your Storyboard Entry Point (the arrow that indicates which view controller is presented first) either pointing to Navigation Controller or before it.

Popping ViewController on Swift

4 Answers4