@IBOutlet weak var switch1: UISwitch!
@IBOutlet weak var switch2: UISwitch!
@IBOutlet weak var switch3: UISwitch!

@IBAction func switch1Change(_ sender: UISwitch) {
        
    if switch1.isOn {
        switch2.setOn(false, animated: true)
        switch3.setOn(false, animated: true)
    } else {
        switch2.setOn(true, animated: true)
        switch3.setOn(true, animated: true)
    }
        
}