Flutter 如何在颤振中输入编号的某些位置使用连字符创建文本字段

我正在制作一个UI，我必须在其中显示输入文本字段，如下所示：

Container(
            width: 200,
            child: Center(
              child: TextFormField(
                keyboardType: TextInputType.number,
                inputFormatters: [
                  WhitelistingTextInputFormatter.digitsOnly,
                  new LengthLimitingTextInputFormatter(13),
                  new NumberFormatter()
                ],
              ),
            ),
          ),

//Custom InputFormatter
class NumberFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue, TextEditingValue newValue) {
    var text = newValue.text;

    if (newValue.selection.baseOffset == 0) {
      return newValue;
    }

    var buffer = new StringBuffer();
    for (int i = 0; i < text.length; i++) {
      buffer.write(text[i]);
      var nonZeroIndex = i + 1;
      print(text.length);
      if (nonZeroIndex <= 5) {
        print("non");
        print(nonZeroIndex);
        if (nonZeroIndex % 5 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      } else {
        if (nonZeroIndex % 12 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      }
    }

    var string = buffer.toString();
    return newValue.copyWith(
        text: string,
        selection: new TextSelection.collapsed(offset: string.length));
  }
}

我试图使它像这样，但无法使，因为我是新的扑动。在颤振中是否有任何类型的小部件可以满足此要求，或者您可以指导我如何制作此小部件。

使用此软件包，您可以按以下方式进行操作。这将在用户键入数字时，在所需位置使用连字符自动格式化文本

class _MyWidgetState extends State<MyWidget> {
  MaskedTextController tc = MaskedTextController(mask: '00000-0000000-0');

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: tc,
      decoration: InputDecoration(
        hintText: 'e.g. 61101-1234524-1',
      ),
    );
  }
}

使用此软件包，您可以按如下方式执行此操作。这将在用户键入数字时，在所需位置使用连字符自动格式化文本

class _MyWidgetState extends State<MyWidget> {
  MaskedTextController tc = MaskedTextController(mask: '00000-0000000-0');

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: tc,
      decoration: InputDecoration(
        hintText: 'e.g. 61101-1234524-1',
      ),
    );
  }
}

---

你可以试试这个。如果要在一行中使用多个文本字段

Container(
            width: 200,
            padding: EdgeInsets.all(8),
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(10),
              border: Border.all(color: Colors.blue)
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                    width: 50,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f1,
                      onChanged: (String newVal) {
                        if (newVal.length == 5) {
                          f1.unfocus();
                          FocusScope.of(context).requestFocus(f2);
                        }
                      },
                    )),
                Text(" - "),
                Container(
                    width: 70,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f2,
                      onChanged: (String newVal) {
                        if (newVal.length == 7) {
                          f2.unfocus();
                          FocusScope.of(context).requestFocus(f3);
                        }
                        if(newVal == ''){
                          f2.unfocus();
                          FocusScope.of(context).requestFocus(f1);
                        }
                      },
                    )),
                Text(" - "),
                Container(
                    width: 10,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f3,
                      onChanged: (String newVal) {
                        if (newVal.length == 1) {
                          f3.unfocus();
                        }
                        if(newVal == ''){
                          f3.unfocus();
                          FocusScope.of(context).requestFocus(f2);
                        }
                      },
                    )),
              ],
            ),
          ),

输出：

但如果您想在单个文本字段中执行此操作，则应执行以下操作：

Container(
            width: 200,
            child: Center(
              child: TextFormField(
                keyboardType: TextInputType.number,
                inputFormatters: [
                  WhitelistingTextInputFormatter.digitsOnly,
                  new LengthLimitingTextInputFormatter(13),
                  new NumberFormatter()
                ],
              ),
            ),
          ),

//Custom InputFormatter
class NumberFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue, TextEditingValue newValue) {
    var text = newValue.text;

    if (newValue.selection.baseOffset == 0) {
      return newValue;
    }

    var buffer = new StringBuffer();
    for (int i = 0; i < text.length; i++) {
      buffer.write(text[i]);
      var nonZeroIndex = i + 1;
      print(text.length);
      if (nonZeroIndex <= 5) {
        print("non");
        print(nonZeroIndex);
        if (nonZeroIndex % 5 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      } else {
        if (nonZeroIndex % 12 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      }
    }

    var string = buffer.toString();
    return newValue.copyWith(
        text: string,
        selection: new TextSelection.collapsed(offset: string.length));
  }
}

输出：

---

你可以试试这个。如果要在一行中使用多个文本字段

Container(
            width: 200,
            padding: EdgeInsets.all(8),
            decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(10),
              border: Border.all(color: Colors.blue)
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                    width: 50,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f1,
                      onChanged: (String newVal) {
                        if (newVal.length == 5) {
                          f1.unfocus();
                          FocusScope.of(context).requestFocus(f2);
                        }
                      },
                    )),
                Text(" - "),
                Container(
                    width: 70,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f2,
                      onChanged: (String newVal) {
                        if (newVal.length == 7) {
                          f2.unfocus();
                          FocusScope.of(context).requestFocus(f3);
                        }
                        if(newVal == ''){
                          f2.unfocus();
                          FocusScope.of(context).requestFocus(f1);
                        }
                      },
                    )),
                Text(" - "),
                Container(
                    width: 10,
                    child: TextField(
                      keyboardType: TextInputType.number,
                      focusNode: f3,
                      onChanged: (String newVal) {
                        if (newVal.length == 1) {
                          f3.unfocus();
                        }
                        if(newVal == ''){
                          f3.unfocus();
                          FocusScope.of(context).requestFocus(f2);
                        }
                      },
                    )),
              ],
            ),
          ),

输出：

但如果您想在单个文本字段中执行此操作，则应执行以下操作：

Container(
            width: 200,
            child: Center(
              child: TextFormField(
                keyboardType: TextInputType.number,
                inputFormatters: [
                  WhitelistingTextInputFormatter.digitsOnly,
                  new LengthLimitingTextInputFormatter(13),
                  new NumberFormatter()
                ],
              ),
            ),
          ),

//Custom InputFormatter
class NumberFormatter extends TextInputFormatter {
  @override
  TextEditingValue formatEditUpdate(
      TextEditingValue oldValue, TextEditingValue newValue) {
    var text = newValue.text;

    if (newValue.selection.baseOffset == 0) {
      return newValue;
    }

    var buffer = new StringBuffer();
    for (int i = 0; i < text.length; i++) {
      buffer.write(text[i]);
      var nonZeroIndex = i + 1;
      print(text.length);
      if (nonZeroIndex <= 5) {
        print("non");
        print(nonZeroIndex);
        if (nonZeroIndex % 5 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      } else {
        if (nonZeroIndex % 12 == 0 && nonZeroIndex != text.length) {
          buffer.write('-'); // Add double spaces.
        }
      }
    }

    var string = buffer.toString();
    return newValue.copyWith(
        text: string,
        selection: new TextSelection.collapsed(offset: string.length));
  }
}

输出：

---

例如：谢谢你的回答。我也赞成你的回答。因为它对新的颤振开发者帮助很大。当我输入一个值12345-6789000-0并删除一个值时，我将光标移动到3并删除3，然后我的光标自动移动到最后一位0，为什么？谢谢你的回答。我也赞成你的回答。当我输入一个值12345-6789000-0并删除一个值时，我将光标移动到3并删除3，然后我的光标自动移动到最后一位0，为什么？