在不同导航控制器中的选项卡栏控制器屏幕之间导航

Question

First of all sorry if I'm explaining this badly, I've re-read my question several times and I can't figure out how a great way to explain the problem. Please let me know if you have any other questions...

My app has a layout that requires the screens to be embedded in both a tab bar controller and navigation controller. I've got it set up so that it works for the most part, however I'm running into some problems navigating from one navigation controller/tab to another - I have one navigation controller for one tab (where the user selects an image to upload), and a second navigation controller for the screens in the second tab. Here is what it looks like in storyboard:

The problem I have is that once the user selects a photo to post in the "upper" navigation controller (the "right" tab) and hits "post", I navigate to the newly updated feed (which is within the other tab) with:

                let feedController = self.storyboard?.instantiateViewController(withIdentifier: "feedVC") as! FeedViewController
                feedController.navigationItem.setHidesBackButton(true, animated: false)
                self.navigationController?.pushViewController(feedController, animated: true)

And while the screen and updated feed appear correctly, I am still within the "right" tab, when the feed should be in the "left" tab.

My question is, how do I correctly navigate to the other navigation controller, and be put back within the correct tab?

Answer 1

You can switch tabs instead of pushing a new view controller onto the current tab's navigation stack using tabBarController?.selectedIndex = 0 . This should take you back to the original feed page with no need for any of the push code.

In order to update it with the new post, you'll need to refresh the data when it appears by overriding the view controller's viewWillAppear method to re-fetch the data and reload the collection view.