限制提现金额2位小数

lib/pages/mine/withdraw_page.dart

@@ -6,6 +6,7 @@ import 'package:dating_touchme_app/model/mine/bank_card_data.dart';
 import 'package:dating_touchme_app/pages/mine/add_bankcard_page.dart';
 import 'package:dating_touchme_app/pages/mine/withdraw_history_page.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
 import 'package:get/get.dart';
@@ -195,7 +196,10 @@ class WithdrawPage extends StatelessWidget {
                           Expanded(
                             child: TextField(
                               controller: controller.withdrawMoneyController.value,
-                              keyboardType: TextInputType.number,
+                              keyboardType: const TextInputType.numberWithOptions(decimal: true),
+                              inputFormatters: [
+                                DecimalTextInputFormatter(decimalRange: 2),
+                              ],
                               style: TextStyle(
                                   fontSize: ScreenUtil().setWidth(22),
                                   height: 1
@@ -582,3 +586,39 @@ class WithdrawPage extends StatelessWidget {
   }
 }
 
+class DecimalTextInputFormatter extends TextInputFormatter {
+  DecimalTextInputFormatter({this.decimalRange = 2});
+
+  final int decimalRange;
+
+  @override
+  TextEditingValue formatEditUpdate(
+      TextEditingValue oldValue,
+      TextEditingValue newValue,
+      ) {
+    final text = newValue.text;
+
+    // 允许空
+    if (text.isEmpty) return newValue;
+
+    // 只允许数字和小数点
+    if (!RegExp(r'^\d*\.?\d*$').hasMatch(text)) {
+      return oldValue;
+    }
+
+    // 只允许一个小数点
+    if ('.'.allMatches(text).length > 1) {
+      return oldValue;
+    }
+
+    // 限制小数位数
+    if (text.contains('.')) {
+      final parts = text.split('.');
+      if (parts.length > 1 && parts[1].length > decimalRange) {
+        return oldValue;
+      }
+    }
+
+    return newValue;
+  }
+}