計算器中的清除按鈕沒有響應

試圖讓我的清除按鈕能夠工作，但作爲新鮮的程序員，我仍然有一些邏輯發現問題。計算器工作完美，但是當我按下清除任何id發生。計算器中的清除按鈕沒有響應

class ViewController: UIViewController { 

enum Operation: String { 
    case Divide = "/" 
    case Multiply = "*" 
    case Subtract = "-" 
    case Add = "+" 
    case Empty = "Empty" 

} 

@IBOutlet weak var outputLbl: UILabel! 

var btnSound: AVAudioPlayer! 

var runningNumber = "" 
var leftValStr = "" 
var rightValStr = "" 
var currentOperation: Operation = Operation.Empty 
var result = "" 


override func viewDidLoad() { 
    super.viewDidLoad() 

    let path = NSBundle.mainBundle().pathForResource("btn", ofType: "wav") 
    let soundUrl = NSURL(fileURLWithPath: path!) 

    do{ 
     try btnSound = AVAudioPlayer(contentsOfURL: soundUrl) 
     btnSound.prepareToPlay() 
    } catch let err as NSError{ 
    print(err.debugDescription) 
    } 
} 

@IBAction func numberPressed(btn: UIButton!){ 
    playSound() 
    runningNumber += "\(btn.tag)" 
    outputLbl.text = runningNumber 
} 

@IBAction func onDividePressed(sender: AnyObject) { 
    processOperation(Operation.Divide) 
} 

@IBAction func onMultiplyPressed(sender: AnyObject) { 
    processOperation(Operation.Multiply) 
} 

@IBAction func onSubtractPressed(sender: AnyObject) { 
    processOperation(Operation.Subtract) 
} 

@IBAction func onAddPressed(sender: AnyObject) { 
    processOperation(Operation.Add) 
} 

@IBAction func onEqualPressed(sender: AnyObject) { 
    processOperation(currentOperation) 
} 

@IBAction func onClearPressed(sender: AnyObject) { 
    processOperation(Operation.Empty) 
} 

func processOperation(op: Operation) { 
    playSound() 

    if currentOperation != Operation.Empty{ 
     //run math 

     //a user selected an operator, but then selected another operator without 
     //first entering a number 
     if runningNumber != ""{ 

     rightValStr = runningNumber 
     runningNumber = "" 

     if currentOperation == Operation.Multiply{ 
     result = "\(Double(leftValStr)! * Double(rightValStr)!)" 
     } else if currentOperation == Operation.Divide{ 
     result = "\(Double(leftValStr)!/Double(rightValStr)!)" 
     } else if currentOperation == Operation.Subtract{ 
     result = "\(Double(leftValStr)! - Double(rightValStr)!)" 
     } else if currentOperation == Operation.Add{ 
     result = "\(Double(leftValStr)! + Double(rightValStr)!)" 
     } else if currentOperation == Operation.Empty{ 

      result = "" 
      outputLbl.text = result 


      } 

     leftValStr = result 
     outputLbl.text = result 

     } 


     currentOperation = op 


    }else{ 
     //first time its been pressed 
     leftValStr = runningNumber 
     runningNumber = "" 
     currentOperation = op 
    } 
} 

func playSound() { 
    if btnSound.playing{ 
     btnSound.stop() 
    } 
    btnSound.play() 
    } 
}

來源

2016-04-21 Koljane

我不知道這個，但嘗試這個代碼可能是它幫助你

@IBAction func onClearPressed(sender: AnyObject) 
{ 
     outputLbl.text = @""; 
    //processOperation(Operation.Empty) 
}

來源

2016-04-21 10:22:27

非常感謝！不得不做出一些tweek：d outputLbl.text =「0」現在，當我按下清除按鈕將其重置並設置計算器0 – Koljane

會做的那一刻我賺15爬行點：d – Koljane

看看你的代碼再次 - 你有一個檢查：

if currentOperation != Operation.Empty { ...

然後

... else if currentOperation == Operation.Empty {

第二如果身體會不會被執行！

來源

2016-04-21 10:19:19

在你的其他部分，你必須清楚的標籤。首先檢查操作是否爲空，並且在主體中定義相同。

來源

2016-04-21 10:28:40 hemant3370

可悲的力幫助，但它給了我新的想法：D感謝您的幫助。 – Koljane

計算器中的清除按鈕沒有響應

回答

相關問題