여러 버튼 정리 didTouchUpInside로 관리

    @IBAction func didTouchUpInside(_ sender: AnyObject) {
        //textTarget.resignFirstResponder()
        print("sender in")

        switch sender.tag {
        case 1:
            print("button1")
        //printerPicker!.showPicker()
        case 2:
            print("button2")
        //langPicker!.showPicker()
        case 3:
            print("button3")
        case 4:
            print("button4")
        default:
            print("sender out")
            break
        }
    }