TextField常用属性

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class TextFieldPage extends StatelessWidget {
  Widget buildTextField(TextEditingController controller) {
    return TextField(
      controller: controller,
      maxLength: 30,//最大长度，设置此项会让TextField右下角有一个输入数量的统计字符串
      maxLines: 1,//最大行数
      autocorrect: true,//是否自动更正
      autofocus: true,//是否自动对焦
      obscureText: true,//是否是密码
      textAlign: TextAlign.center,//文本对齐方式
      style: TextStyle(fontSize: 30.0, color: Colors.blue),//输入文本的样式
      inputFormatters: [WhitelistingTextInputFormatter.digitsOnly],//允许的输入格式
      onChanged: (text) {//内容改变的回调
        print('change $text');
      },
      onSubmitted: (text) {//内容提交(按回车)的回调
        print('submit $text');
      },
      enabled: true,//是否禁用
    );
  }

  @override
  Widget build(BuildContext context) {
    final controller = TextEditingController();
    controller.addListener(() {
      print('input ${controller.text}');
    });
    return Scaffold(
      appBar: AppBar(
        title: Text('TextField'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(20.0),
        child: buildTextField(controller),
      ),
    );
  }
}