Navigation via back button leak

[jcyu0208]

In your RouterImp, you store a Dictionary of completions with the ViewController as the key. I think that there is a potential leak here.

The leak will occur when you're using a Navigation Bar's back button instead of programmatically popping the view controller. The Router's dictionary still maintains a reference to the view controller because the back button is not hooked to the router.

[chosa91]

@jcyu0208 You can use something like this:
NavigationControllerObserver - gist
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