Question

其他问题：

我的代码仍需要一些帮助。文本字段是“测量值”＆＃39;我打算有30个不同的texfields（measuredValue1 ... 30）。当我输入＆＃39; 923＆＃39;该文本将设置为＆＃39; 9.23＆＃39;马上。然后我想添加＆＃39; ...＆＃39; 92.34＆＃39;但那不起作用。谢谢你的帮忙。

func textField(textField: UITextField,
shouldChangeCharactersInRange range: NSRange,
replacementString string: String)
-> Bool {

    if count(string) == 0 { return true }

    var measuredValue = (textField.text as NSString).stringByReplacingCharactersInRange(range, withString: string)

    switch textField {

    case digitsOnlyTextField:

        if count(measuredValue) == 3  || count(measuredValue) == 4 {
            let stringNumeric = Double(measuredValue.toInt()!) / 100
            measuredValue = String(format:"%.2f", stringNumeric)
            digitsOnlyTextField.text = measuredValue
        }

        return measuredValue.containsOnlyCharactersIn("0123456789") && count(measuredValue) <= 4

    default:
        return true
    }

}

原始问题：

我想验证我的文字字段，以便为我的应用获得正确的输入。输入需要格式化为＆＃39; 9.90＆＃39;或者＆＃39; 15.34＆＃39;。所以总是3或4位数，总是2位小数。

我想使用＆＃39;数字键盘＆＃39; （仅0 ... 9，无点）并在用户退出字段后添加小数点。因此用户输入为990或1534，然后在文本字段中自动变为9.90或15.34。

我首先尝试搜索示例，但没有找到我要找的内容。任何帮助赞赏。扬

Answer 1

您必须实施UITextField委托方法

func textFieldDidEndEditing(textField: UITextField) {
    //Logic goes here....
    var textString = textField.text as! String
    let textLength = countElements(textString)
    if textLength >= 3 && textLength <= 4 {
        let stringNumeric = Double(textString.toInt()!) / 100
        let texts = String(format:"%.2f", stringNumeric)
        textField.text = texts
    }
}

您的班级应确认协议UITextFieldDelegate

Answer 2

这是我使用的'最终'代码（但我愿意接受改进！）。一些评论：

当用户点击背景（并离开文本字段）时小数点设置。
当用户复制＆amp;从另一个应用程序粘贴文本，此代码处理该文本。
当用户返回文本字段进行编辑时，小数点会再次设置。
正确处理删除值（到空文本字段）。

所以我很高兴。谢谢你的帮助。

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var numberField: UITextField!

  override func viewDidLoad() {
super.viewDidLoad()
numberField.delegate = self
numberField.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(numberField.text) > 0 {
        var numberString = numberField.text
        numberString = numberString.stringByReplacingOccurrencesOfString(".", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
        var numberFromString = Double(numberString.toInt()!) / 100
        numberField.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 == numberField {
            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
}

数字输入在文本字段中

2 个答案: