CODEWITHSUNDEEP
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Finley Siebert
Finley Siebert

Reputation: 23

How to perform an action after performSegue is finished in Swift

Is there any possible way to perform an action after a segue has finished in swift?

I am calling this code:

self.performSegue(withIdentifier: "showDamageReportSegue", sender: self)

The segue opens a new ViewController modal and after the user presses the done button I want it to continue running the code underneath which is 

self.performReservationEndingSequence() // which does some calls etc

Is there maybe a completion handler for performSegue that I am missing? I've been searching but I cannot find this specific question.

Upvotes: 0

Views: 2239

Answers (4)

vadian
vadian

Reputation: 285132

A reasonable solution is a callback closure.

  • In the showDamageReportSegue controller add a callback property

    var callback : (() -> Void)?

  • In the showDamageReportSegue controller call callback in viewDidDisappear

    override func viewDidDisappear(_ animated : Bool) {
    super.viewDidDisappear(animated)
    callback?()
}

    or at any other arbitrary place.

  • In the first view controller implement prepare(for and set the callback

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   guard segue.identifier == "showDamageReportSegue" else { return }
   let destination = segue.destination as! ShowDamageReportController // change that to the real class
   destination.callback = {
       self.performReservationEndingSequence() 
   }
}

Upvotes: 4

Haya Hashmat
Haya Hashmat

Reputation: 137

You can try swift's method :

viewDidDisappear()

Upvotes: 0

Mumtaz Hussain
Mumtaz Hussain

Reputation: 1125

Write it in viewDidDisappear event of the view controller.

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidAppear(animated)
    print("ViewController Dismissed")
}

Edit: For some code to execute over a specific segue, use prepare delegate method with the triggering segue's identifier and it should execute whenever that segue is triggered:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier  == "SomeViewController" {
      print("Segue triggered for SomeViewController")
    }
}

Upvotes: 2

Keshu R.
Keshu R.

Reputation: 5223

There is a prepareForSegue method which is called before performSegue, you can call your function there. and also check if segue.identifier == "yourIdentifier" , then only call the function, else dont

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "yourSegueIdentifier" {
        self.performReservationEndingSequence() // call the function
    } else {
        print("dont call the function")
    }
}

Upvotes: 0

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