How to make an action connection for multiple buttons in xcode10?

I am wondering how do we make an action connection for multiple buttons in Xcode10. Just ONE CODE for ALL buttons.NOT SEPARATE.

For example, we have 7 music key buttons, and we want to make one action connection for all 7 of them, and then continue to code to make the code know which key is being exactly pressed. As the code that I posted in this question, how do we make " @IBAction func notePressed(_ sender: UIButton)" this line? Not by typing, by clicking and dragging.

Another example is, we have "true" and "false", two buttons. We want to make just one action connection for these two buttons in ViewController.swift.

I know how to make one action connection for a single button, but when it comes to multiple buttons, I do not know how to do. I use xcode10

I have tried to hold the command and select all the buttons at the same time, and then hold the control key and try to drag all the buttons from the mainStoryBoard to my swift code, but it seems that I only created an action connection for on button in this way.

@IBAction func notePressed(_ sender: UIButton)
    {
        let selectedNote : String = soundArray[sender.tag - 1]
        playSound(inputNote : selectedNote)

    }