Pass data back from previos VC if segue already in use

Question

I have VC "A", from which I pass some data to "B". In attribute inspector i called my seque "B" :

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "B" {
            let vc = segue.destination as! ChooseController
            vc.someData = "passedDataFromAToB"
    }

After that i want to pass some data back from B to A using delegates and protocols, but it turns out that my segue identifier is busy. I have to create new segue? But how, programmatically?

You can use unwind segues. Check out [this](https://stackoverflow.com/a/15839298/1077789) answer. — Isuru, Jun 24 '19 at 09:10
Use delegate method to pass data back from VC "B" to VC "A", then dismiss the VC "B" — Peter Guo, Jun 24 '19 at 09:19

score 0 · Accepted Answer · answered Jun 24 '19 at 09:08

You need to set the delegate here

let vc = segue.destination as! ChooseController
vc.delegate = self
vc.someData = "passedDataFromAToB"

class ChooseController:UIViewController {
  weak var delegate:AVC?

then to pass data before dismiss

delegate?.sendData(data)
self.dismiss(animated:true,completion:nil)

Pass data back from previos VC if segue already in use

1 Answers1