避免複製很多按鈕的代碼

Question

編輯我的問題：

Grimxn，我做了一個子類，可以看到它的工作原因，因爲borderWidth和color。但我仍然對如何添加我的函數幾個問題：

1. 我應該代碼「FUNC文本框（文本框：的UITextField」或「FUNC文本框（文本框：MyCustomTextField」？
2. 我應該怎麼跟做「如果文本框== numberField01 {」？

3. 如何從視圖控制器代碼 '稱之爲'？

   class ViewController: UIViewController, UITextFieldDelegate { 
   
   @IBOutlet weak var numberField01: UITextField! 
   @IBOutlet weak var numberField02: MyCustomTextField! 
   
   override func viewDidLoad() { 
   super.viewDidLoad() 
   numberField01.delegate = self 
   numberField01.keyboardType = UIKeyboardType.NumberPad 
   numberField02.delegate = self 
   numberField02.keyboardType = UIKeyboardType.NumberPad 
   

   }

   class MyCustomTextField: UITextField { 
   required init(coder aDecoder: NSCoder) { 
       super.init(coder: aDecoder) 
       self.layer.borderColor = UIColor.redColor().CGColor 
       self.layer.borderWidth = 1.5 
   
       func textField(textField: UITextField, 
        shouldChangeCharactersInRange range: NSRange, 
        replacementString string: String) 
        -> Bool { 
         var result = true 
         var prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string) 
         prospectiveText = prospectiveText.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil) 
         if textField == numberField01 { 
          if count(string)>0 { 
           let disallowedCharacterSet = NSCharacterSet(charactersInString: "").invertedSet 
           let replacementStringIsLegal = string.rangeOfCharacterFromSet(disallowedCharacterSet) == nil 
           let resultingStringLengthIsLegal = count(prospectiveText) <= 4 
           let scanner = NSScanner(string: prospectiveText) 
           let resultingTextIsNumeric = scanner.scanDecimal(nil) && scanner.atEnd 
           result = replacementStringIsLegal && resultingStringLengthIsLegal && resultingTextIsNumeric 
          } 
         } 
         return result 
       } 
   } 
   
   } 
   

   原始問題： 以下代碼適用於一個文本字段（numberField01）。它確保輸入僅爲十進制，放置小數點，並防止用戶粘貼非十進制字符串。但我有更多的按鈕...（numberField02和以上）。我怎樣才能處理更多的按鈕，而不需要爲每個按鈕複製我的代碼？

   class ViewController: UIViewController, UITextFieldDelegate { 
   
   @IBOutlet weak var numberField01: UITextField! 
   @IBOutlet weak var numberField02: UITextField! 
   
   override func viewDidLoad() { 
   super.viewDidLoad() 
   numberField01.delegate = self 
   numberField01.keyboardType = UIKeyboardType.NumberPad 
   numberField02.delegate = self 
   numberField02.keyboardType = UIKeyboardType.NumberPad 
   } 
   
   override func didReceiveMemoryWarning() { 
   super.didReceiveMemoryWarning() 
   } 
   
   // Tap background to add decimal point and defocus keyboard 
   
   @IBAction func userTappedBackground(sender: AnyObject) { 
   for view in self.view.subviews as! [UIView] { 
       if let textField = view as? UITextField { 
       if count(numberField01.text) > 0 { 
        var numberString = numberField01.text 
        numberString = numberString.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil) 
        var numberFromString = Double(numberString.toInt()!)/100 
        numberField01.text = String(format:"%.2f", numberFromString) 
       } 
       textField.resignFirstResponder() 
       } 
   } 
   } 
   
   func textField(textField: UITextField, 
       shouldChangeCharactersInRange range: NSRange, 
       replacementString string: String) 
       -> Bool { 
        var result = true 
        var prospectiveText = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string) 
        prospectiveText = prospectiveText.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil) 
        if textField == numberField01 { 
         if count(string)>0 { 
          let disallowedCharacterSet = NSCharacterSet(charactersInString: "").invertedSet 
          let replacementStringIsLegal = string.rangeOfCharacterFromSet(disallowedCharacterSet) == nil 
          let resultingStringLengthIsLegal = count(prospectiveText) <= 4 
          let scanner = NSScanner(string: prospectiveText) 
          let resultingTextIsNumeric = scanner.scanDecimal(nil) && scanner.atEnd 
          result = replacementStringIsLegal && resultingStringLengthIsLegal && resultingTextIsNumeric 
         } 
        } 
        return result 
   } 
   } 
   

Answer 1

因此，一些類似以下內容：

Button GetButtonCommonFeatures(Button myButton) 
    { 
     Write common code here.... 
     e.g. myButton.delegate = self;... 
     return myButton; 
    } 

然後調用你的方法爲每個按鈕。例如，讓我們以numberField01爲例。您將在適用於每個按鈕的方法中包含代碼。

numberField01 = GetButtonCommonFeatures(numberField01); 

希望這有助於