Swift 3 : How can I go to the previous ViewController and reload it?

Question

I'm trying to go back to the previous view controller and when I go back to this page, I need to reload the view controller. I used viewWillAppaer in the A view controller, but it doesn't work when I call the popViewController in B view controller.

I used this code in B viewController :

self.navigationController?.popViewController(animated: true)

Answer 1

Are you sure you're presenting the ViewControllers on a NavigationController ? What could be happening is you're presenting the ViewController on top of ViewController A therefor to dismiss it you would need to call dismiss(animated: true, completion: nil) on ViewController B.

https://developer.apple.com/documentation/uikit/uiviewcontroller/1621505-dismiss

NavigationController guide: https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/ImplementNavigation.html

Answer 2

If you're going to pop a navigation controller, you need to make sure you first pushed the navigation controller onto the navigation stack. Otherwise, you can use

present(UIViewController)
dismiss(UIViewController)