ios - How to use one IBAction for multiple buttons in Swift?

Question

I have multiple buttons each one with the ability to switch the language of the app. Instead of having to create multiple IBActions for each button is there a way to have them all connected to one IBAction and change the language based on the button pressed? I'm thinking a switch statement would be good to use in this situation but not exactly sure how to set it up.

Answer 1

In Interface Builder, select the Attributes Inspector and set the Tag for each button with a unique number, then you can do something like this:

@IBAction changeLanguage(sender: AnyObject) {
    guard let button = sender as? UIButton else {
        return
    }

    switch button.tag {
    case 1:
        // Change to English
    case 2:
        // Change to Spanish
    case 3:
        // Change to French, etc
    default:
        print("Unknown language")
        return
    }
}

To connect the action to multiple buttons: in Interface Builder, right-click ViewController in the view hierarchy, then left-click to drag the action connection to each button.