gistfile1.txt

    @IBAction func switchAction(_ sender: UISwitch) {
        print("switchGood\(switchGood.isOn), switchFast\(switchFast.isOn), switchCheap\(switchCheap.isOn)")

        switch sender.tag {
        case 0: //switchGood
            setupSwitchsStatus(labelSource: labelGood, switchSource: switchGood, labelDesignated1: labelFast, switchDesignated1: switchFast, labelDesignated2: labelCheap, switchDesignated2: switchCheap)
            
        case 1: //switchFast
            setupSwitchsStatus(labelSource: labelFast, switchSource: switchFast, labelDesignated1: labelGood, switchDesignated1: switchGood, labelDesignated2: labelCheap, switchDesignated2: switchCheap)
            
        case 2: //switchCheap
            setupSwitchsStatus(labelSource: labelCheap, switchSource: switchCheap, labelDesignated1: labelGood, switchDesignated1: switchGood, labelDesignated2: labelFast, switchDesignated2: switchFast)
            
        default:
            break;
        }
    }
    
    func setupSwitchsStatus(labelSource: UILabel, switchSource: UISwitch, labelDesignated1: UILabel, switchDesignated1: UISwitch,labelDesignated2: UILabel, switchDesignated2: UISwitch) {
        if (switchSource.isOn == true) {
            labelSource.alpha = 1.0
            if (switchDesignated1.isOn == true) {
                switchDesignated2.setOn(false, animated: true)
                labelDesignated2.alpha = 0.5
            } else if (switchDesignated2.isOn == true) {
                switchDesignated1.setOn(false, animated: true)
                labelDesignated1.alpha = 0.5
            }
        } else {
            labelSource.alpha = 0.5;
            if (switchDesignated1.isOn == true) {
                switchDesignated2.setOn(true, animated: true)
                labelDesignated2.alpha = 1.0
            } else if (switchDesignated2.isOn == true) {
                switchDesignated1.setOn(true, animated: true)
                labelDesignated1.alpha = 1.0
            }
        }
    }