練習題-數學小神童

學習目的
-學習 IBOutlet 和 IBAction

這次的練習並沒有用到新的技巧，基本都是前面所學綜合應用

將畫面還有會用到的outlet跟action拉好
-這裡可以將兩個UITextField跟UISegmented拉到同一個action

@IBOutlet weak var firstNumberTextField: UITextField!
@IBOutlet weak var secondNumberTextField: UITextField!
@IBOutlet weak var answerLabel: UILabel!
@IBOutlet weak var symbolSegmented: UISegmentedControl!
var sum = 0.00
@IBAction func calculatorTextField(_ sender: Any) {
    if firstNumberTextField.text != "",secondNumberTextField.text !=  
    ""{
        //另外寫一個function去計算
        calculation(symbol: symbolSegmented.selectedSegmentIndex,
        number1: firstNumberTextField.text!,number2:  
        secondNumberTextField.text!)
        answerLabel.text = "答案：\(String(format: "%0.2f", sum))"
     }
}

計算的function：

func calculation(symbol:Int,number1:String,number2:String){
    switch symbol {
    case 0:
    sum = Double(number1)!+Double(number2)!
    case 1:
    sum = Double(number1)!-Double(number2)!
    case 2:
    sum = Double(number1)!*Double(number2)!
    case 3:
    sum = Double(number1)!/Double(number2)!
    default:
    break
    }
}

GitHub:

WuMinFu/CalculationApp