How to Create Delegate in Swift

1. In class that send the data create protocol:

protocol BackButtonActionDelegate {
    func pressFinished(){}
}

2. Inside this class:

class BackButton: SKNode {
    var delegate: BackButtonActionDelegate?
}

3. Inside the class send the data, run the delegate message when needed:

delegate?.pressFinished()

Inside another class, that received data, add delegate:

class OptionsWindow: SKNode, BackButtonActionDelegate {

}

Add same function from sender:

func pressFinished() {
    print("delegate triggered")
}

Inside another class, that received data, in viewDidLoad() add:

backButton.delegate = self

Done.