Need notification in code, if user change View

Question

Luise_2020 OP

Created Mar ’21

Replies 3

Boosts 0

Participants 3

I am using an AVSpeechSythesizer(), which reads the list (TableViewCells) on one view to the user, if the user hits a button. If the user hits the button again the AVSpeechSynthesizer() stops, as I want it to be. But I want the AVSpeechSynthesizer() to stop as well, if the user change the view (go back or hit the home Button). Is it possible that the ViewController of that view get Notification, if the View is no longer shown or have I to check in the other ViewControllers?

Answered by OOPer in 664740022

Maybe you can use viewWillDisappear.

Boost

Answer 1

OOPer OP

Mar ’21

Accepted Answer

Maybe you can use viewWillDisappear.

1

Answer 2

Claude31 OP

Mar ’21

Accepted Answer

What you should do, in the VC :

Declare at class level:

Code Block     var synthesizer : AVSpeechSynthesizer?

Everywhere you need to speak, you set the var : // Avoid superposition of speakers

Code Block             if synthesizer != nil {   
                synthesizer!.stopSpeaking(at: .immediate)
                synthesizer = nil
            }
            let newSynthe = whatToSpeak.speakIt()
            synthesizer = newSynthe

And close when disappear:

Code Block     override func viewWillDisappear(_ animated: Bool) {
        
        super.viewWillDisappear(animated)
        
        if synthesizer != nil {   
            synthesizer!.stopSpeaking(at: .immediate)
            synthesizer = nil
        }
    }

Used, works well.

1

Answer 3

Luise_2020 OP

Mar ’21

Thank you, worked well!

0