Swift 3 - X-Code 8 - IOS

I will prepare a rating on my Xcode project; so I need the following;

I have 5 rating buttons, from worse to very good, and each has its own if statement as below;

@IBAction func btnHeart1Pressed(_ sender: UIButton) {

    if sender.isSelected {

        sender.isSelected = false

    }else {
        sender.isSelected = true
    }

}

But;

by clicking on the e.g. third button, first, second and third button shall be selected or by selecting the fifth button, all 5 buttons shall be selected.