Flutter之TextField输入长度限制

1.引入头文件

import 'package:flutter/services.dart';

2.

限制TextField 输入长度需要inputFormatters 属性及属性值：LengthLimitingTextInputFormatter(6)

代码如下

TextField(    style: TextStyle(fontSize: ScreenUtil().setWidth(16), color: Colors.black),    controller: _controller,//控制器    decoration: InputDecoration(      hintText: 请输入标题，      hintStyle: TextStyle( fontWeight: FontWeight.w500, fontSize: ScreenUtil().setWidth(20), color: Colors.grey[400]),      border: InputBorder.none,    ),    inputFormatters: <TextInputFormatter>[      LengthLimitingTextInputFormatter(6)//限制长度    ],    onChanged: (v){          // textField回调输入内容      }, )),