I have been learning swift and have made the foundation of most of my app. I have the following storyboard
app storyboard
Everything works fine. For example
Like Craig in the comments said, it's not that easy to find the problem. So I just build a simple app where you can follow the steps as guide and see if you forgot something to setup the functionality right. Hope it will help you. Note: Code is in Swift 3.0, but should be easy to adopt to 2.*
1. Storyboard with two View Controllers:
2. Declare the action method for the unwind segue in the FirstViewController.swift
:
class FirstViewController: UIViewController {
// action method for the unwind segue
@IBAction func updateScore(_ segue: UIStoryboardSegue) {
print("Back in the FirstViewController")
}
}
3. Connect the Save button
in the Storyboard with the action method (with ctrl + drag):
4. Connect your Save button
with the SecondViewController.swift
file, to use it for checking in your prepareSegue
method (with ctrl + drag):
5. Add the prepare(for:sender:)
method to your SecondViewController.swift
:
class SecondViewController: UIViewController {
@IBOutlet weak var saveButtonPressed: UIBarButtonItem!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// check safely with guard that your save button is the sender and you can use it
// if not print message
guard let uiBarButtonItem = sender as? UIBarButtonItem else {
print("There is no UIBarButtonItem sender")
return
}
// check if you selected the save button
if saveButtonPressed == uiBarButtonItem {
print("save button selected")
}
}
}
Result:
The sample app you can find here