iOS - navigation views

How to Create a Navigation View via Storyboards

1. Add a UINavigationController into the storyboard from the object library.
   1. Make sure to set it as your Initial View Controller
   2. If you don’t want to use the automatically generated RootViewController, then delete it and create another ViewController of your choosing
      1. To reset the Navigation Controller’s Root View Controller property control click on the Navigation Controller’s round yellow icon and drag a line from the root view controller triggered segue to your new view controller or set Relationship Segue from Navigation Controller to new View Controller as root view controller
   3. Add more View Controllers to your stack by adding more segues via buttons or other actions.
   4. Repeat!

   

How to Add Navigation Items

Each View Controller that is embedded in a UINavigationController has an optional reference to the UINavigationController object. Within the UINavigationController, exists a navigationItem property, which is used to access the items in the naviagiation bar. A navigation flow uses a stack (last in, first out) to manage its views. Therefore a view is pushed (added on top of another view) or popped (removed from the top) to flow from one view to another.

Code Sample:

Pushing View Controllers

if let navigationController = navigationController {
        let viewController = self.storyboard!.instantiateViewController(withIdentifier: "ViewController") as! ViewController
        navigationController.pushViewController(viewController, animated: true)
    }

Pop to Root View Controller

let _ = navigationController?.popToRootViewController(animated: true)

View controllers are deinitialized when they are popped off the navigation stack.