Flutter 创建新行时如何保持TextFormField边框的高度

所以，事先我使用容器和文本小部件进行了布局，然后我将其更改为TextFormField，但我真的想保留容器的边框。但当我输入新行时，边框/框会自动调整其高度。我不想那样，有办法解决这个问题吗

---

谢谢。

将

minLines

和

maxLines

定义为相同：

完整源代码

---

尝试

maxLines:null，

---

因此，无需提供固定大小，它将根据内容自动调整大小

将您的maxLines设置为null

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: HomePage(),
    ),
  );
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: EdgeInsets.all(10),
        margin: EdgeInsets.all(10),
        decoration: BoxDecoration(
          border: Border.all(width: 2, color: Colors.black),
          borderRadius: BorderRadius.all(Radius.circular(10)),
        ),
        child: TextFormField(
          keyboardType: TextInputType.multiline,
          minLines: 5,
          maxLines: 5,
          style: TextStyle(
            fontSize: 20,
            fontWeight: FontWeight.w600,
            fontFamily: 'Montserrat',
          ),
          decoration: InputDecoration(
            border: InputBorder.none,
            hintText: 'Task Description...',
            hintStyle: TextStyle(
              fontFamily: 'Montserrat',
              fontWeight: FontWeight.w400,
              fontStyle: FontStyle.italic,
              fontSize: 20,
            ),
          ),
        ),
      ),
    );
  }
}

---

这就是我一直在寻找的答案。非常感谢，它成功了！

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: HomePage(),
    ),
  );
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        padding: EdgeInsets.all(10),
        margin: EdgeInsets.all(10),
        decoration: BoxDecoration(
          border: Border.all(width: 2, color: Colors.black),
          borderRadius: BorderRadius.all(Radius.circular(10)),
        ),
        child: TextFormField(
          keyboardType: TextInputType.multiline,
          minLines: 5,
          maxLines: 5,
          style: TextStyle(
            fontSize: 20,
            fontWeight: FontWeight.w600,
            fontFamily: 'Montserrat',
          ),
          decoration: InputDecoration(
            border: InputBorder.none,
            hintText: 'Task Description...',
            hintStyle: TextStyle(
              fontFamily: 'Montserrat',
              fontWeight: FontWeight.w400,
              fontStyle: FontStyle.italic,
              fontSize: 20,
            ),
          ),
        ),
      ),
    );
  }
}

Container(
      padding: EdgeInsets.only(bottom: 150),
      margin: EdgeInsets.all(10),
      decoration: BoxDecoration(
          border: Border.all(width: 2, color: Colors.black),
          borderRadius: BorderRadius.all(Radius.circular(10))),
      child: TextFormField(
        keyboardType: TextInputType.multiline,
        maxLines: null,
        style: TextStyle(
            fontSize: 20,
            fontWeight: FontWeight.w600,
            fontFamily: 'Montserrat'),
        decoration: InputDecoration(
            border: InputBorder.none,
            hintText: 'Task Description...',
            hintStyle: TextStyle(
                fontFamily: 'Montserrat',
                fontWeight: FontWeight.w400,
                fontStyle: FontStyle.italic,
                fontSize: 20)),
      ),
    )