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

Answer 1

Complete answer using optional binding and Swift 3 & 4:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let navigationVC = segue.destination as? UINavigationController, let myViewController = navigationVC.topViewController as? MyViewControllerClass {
        myViewController.yourProperty = myProperty
    }
}

Answer 2

Set the identifier name in the segue arrow property in order to use in the the performeSegue.

Like this:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if let vc: ProfileViewController = segue.destination as? ProfileViewController {

        //do any setting to the next screen

    }

}

and then:

    performSegue(withIdentifier: "yourIdentifierOfViewProfile", sender: indexPath.row)

I hope it helps.

Answer 3

It's a good idea to skip the check for UINavigationController as there may be multiple segues that use a navigationController and so will go into that check for every segue that uses a navigationController. A better way is to check the first viewController of the children and cast it as the viewController you are looking for.

if let destVC = segue.destination.children.first as? MyViewController {
    destVC.hideBottomBar = true
}

Answer 4

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 ...)

Answer 5

A one liner in Swift 3:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
  if let vc = segue.destination.childViewControllers[0] as? FooController {
    vc.variable = localvariable
  }
}

Answer 6

Here is the answer for Swift 3:

let svc = segue.destination as? UINavigationController

let controller: MyController = svc?.topViewController as! MyController
controller.myProperty = "Hi there"