Question

编辑我的问题：

Grimxn，我创建了一个子类，可以看到它的工作原理，因为borderWidth和颜色。但是我仍然有一些关于如何添加我的功能的问题：

我应该编码＆＃34; func textField（textField：UITextField＆＃34;或＆＃34; func textField（textField：MyCustomTextField＆＃34;？
我该怎么做＆＃34;如果textField == numberField01 {＆＃34; ？

我如何称呼这个＆＃39;从ViewController代码？

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: "0123456789").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
    }
}

}

原始问题：以下代码适用于一个文本字段（numberField01）。它确保输入仅为十进制，放置小数点，并防止用户粘贴非十进制字符串。但我有更多的按钮......（numberField02及以上）。如何处理更多按钮，而不只是复制每个按钮的代码？

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: "0123456789").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

类似于以下内容：

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

然后为每个按钮调用您的方法。让我们以numberField01为例。您将在适用于每个按钮的方法中包含代码。

    numberField01 = GetButtonCommonFeatures(numberField01);

希望这有帮助

避免为很多按钮复制代码

1 个答案: