Swift : prepareForSegue with navigation controller

Question

I am developing an iOS application in Swift.

I want to send data from a view to an other one, using the prepareForSegue function.

However, my target view is preceded by a navigation controller, so it doesn't work. How can I set data on the VC contained within the navigation controller?

Answer 1

In prepareForSegue access the target navigation controller, and then its top:

let destinationNavigationController = segue.destination as! UINavigationController let targetController = destinationNavigationController.topViewController 

From the target controller you can access its view and pass data.

In old - now obsolete - versions of Swift and UIKit the code was slightly different:

let destinationNavigationController = segue.destinationViewController as UINavigationController let targetController = destinationNavigationController.topViewController 

Answer 2

1. Prepare the segue in the SendViewController

   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {     if segue.identifier == "segueShowNavigation" {         if let destVC = segue.destination as? UINavigationController,             let targetController = destVC.topViewController as? ReceiveViewController {             targetController.data = "hello from ReceiveVC !"         }     } } 

2. Edit the identifier segue to "showNavigationController"

3. In your ReceiveViewController add

this

var data : String = ""  override func viewDidLoad() {     super.viewDidLoad()     print("data from ReceiveViewController is \(data)") } 

Of course you can send any other type of data (int, Bool, JSON ...)