Use switch to change button image

Question

I am trying to change the image on my button depending on the position of a switch. I am not sure how to do this. I am relatively new to code. I have managed to change the other things on the screen but not the button. I have attached my code. I put this function into the IBAction for the switch:

func updateMySwitchState(){
    if darkModeSwitch.isOn {
        self.view.backgroundColor = UIColor.black
        removeAds.textColor = UIColor.white
        aboutText.textColor = UIColor.white
        about.textColor = UIColor.white
        backButton.setImage(UIImage(named: "backinvert-40"), for: .normal)
    } else {
        self.view.backgroundColor = UIColor.white
        removeAds.textColor = UIColor.black
        aboutText.textColor = UIColor.black
        about.textColor = UIColor.black
        backButton.setImage(UIImage(named: "back-40"), for: .normal)
    }
}

Answer 1

Did you connected the outlet of the button with the controller? You can set both images button image in storyboard itself for normal & selected state respectively. After setting call

backButton.setSelected(true) for first image and backButton.setSelected(false) for the second