class ViewController: UIViewController {

    var 輸入框一 : UITextField?
    var 輸入框二 : UITextField?
    var 計算結(jié)果 : UILabel?
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        setupUI()
    }

    func setupUI() -> ()
    {
        //第一個輸入框
        let oneText = UITextField(frame: CGRect(x: 10, y: 100, width: 80, height: 25))
        oneText.text = "0"
        oneText.textAlignment = .center
        oneText.borderStyle = .roundedRect
        view.addSubview(oneText)
        輸入框一 = oneText
        
        //加號lanel
        let 加號 = UILabel(frame: CGRect(x: 100, y: 100, width: 25, height: 25))
        加號.text = "+"
        加號.textAlignment = .center
        view.addSubview(加號)
        
        //第二個輸入框
         let twoText = UITextField(frame: CGRect(x: 135, y: 100, width: 80, height: 25))
        twoText.text = "0"
        twoText.textAlignment = .center
        twoText.borderStyle = .roundedRect
        view.addSubview(twoText)
        輸入框二 = twoText;
        
        //等號按鈕
        let 等號 = UIButton()
        等號.setTitle("=", for: UIControlState(rawValue: 0))
        等號.setTitleColor(UIColor.black(), for: UIControlState(rawValue: 0))
        等號.frame = CGRect(x: 225, y: 100, width: 25, height: 25)
//        等號.layer.borderWidth = 1
//        等號.layer.borderColor = UIColor.blue().cgColor
        view.addSubview(等號)
        等號.addTarget(self, action: #selector(calc), for: .touchUpInside)
        
        //結(jié)果label
        let 結(jié)果 = UILabel(frame: CGRect(x: 260, y: 100, width: 50, height: 25))
        結(jié)果.textAlignment = .left
        結(jié)果.text = "0"
        view.addSubview(結(jié)果)
        計算結(jié)果 = 結(jié)果
    }
    
    func calc() -> ()
    {
        print(#function)
//        結(jié)算結(jié)果?.text = "\(Int(輸入框一?.text) ?? ""  + Int(輸入框二?.text) ?? "" )"
        
        guard let num1 = Int(輸入框一?.text ?? ""), num2 = Int(輸入框二?.text ?? "") else{
            print("請輸入數(shù)值")
            return
        }
        
        計算結(jié)果?.text = "\(num1+num2)"
    }
}

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