flutterTextField文本输入框 限制 数字键盘、输入小数点后两位

关键代码

       keyboardType: TextInputType.number,
       inputFormatters: [
           FilteringTextInputFormatter(RegExp("[0-9.]"), allow: true),
           MyNumberTextInputFormatter(digit: 2),
       ],

TextField完整代码

                      TextField(
                        controller: _money,
                        keyboardType: TextInputType.number,
                        inputFormatters: [
                          FilteringTextInputFormatter(RegExp("[0-9.]"), allow: true),
                          MyNumberTextInputFormatter(digit: 2),
                        ],
                        textAlign: TextAlign.left,
                        style: TextStyle(fontSize: 25.sp),
                        decoration: InputDecoration(
                          border: InputBorder.none,
                          hintText: '本次最多可提现${alipayMsg['money']}元',
                          hintStyle: TextStyle(color: Color.fromRGBO(119, 119, 119, 1), height: 1),
                        ),
                        autofocus: false,
                        onChanged: (val) {
                          money = val;
                        },
                      )

MyNumberTextInputFormatter完整代码

import 'package:flutter/services.dart';

class MyNumberTextInputFormatter extends TextInputFormatter {
  static const defaultDouble = 0.001;

  ///允许的小数位数，-1代表不限制位数
  int digit;
  MyNumberTextInputFormatter({this.digit = -1});
  static double strToFloat(String str, [double defaultValue = defaultDouble]) {
    try {
      return double.parse(str);
    } catch (e) {
      return defaultValue;
    }
  }

  ///获取目前的小数位数
  static int getValueDigit(String value) {
    if (value.contains(".")) {
      return value.split(".")[1].length;
    } else {
      return -1;
    }
  }

  @override
  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
    String value = newValue.text;
    int selectionIndex = newValue.selection.end;
    if (value == ".") {
      value = "0.";
      selectionIndex++;
    } else if (value == "-") {
      value = "-";
      selectionIndex++;
    } else if (value != "" && value != defaultDouble.toString() && strToFloat(value, defaultDouble) == defaultDouble || getValueDigit(value) > digit) {
      value = oldValue.text;
      selectionIndex = oldValue.selection.end;
    }
    return new TextEditingValue(
      text: value,
      selection: new TextSelection.collapsed(offset: selectionIndex),
    );
  }
}