[移动开发]Flutter组件封装 搜索框

• 相信小白刚刚开始使用Flutter的时候都会感觉自带的组件都好丑，还要自己设置各种样式。接下来就直接上正题：贴代码！！

1. 将下面的代码复制到你工程下组件目录。

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import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
//搜索框
class SearchIow extends StatelessWidget {

  final TextEditingController? textController; //内容
  final onChanged; //输入监听
  final onSubmitted; //键盘回车监听
  final hintText;  //提示文本
  final TextInputType textInputType;//设置键盘弹出时类型

  SearchIow({
    this.textController,
    this.onChanged,
    this.hintText = '请输入内容',
    this.textInputType = TextInputType.text,
    this.onSubmitted
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: new BoxDecoration(
        border: Border.all(color: Colors.grey, width: 0.0), //灰色的一层边框
        color: Colors.white,
        borderRadius: BorderRadius.all( Radius.circular(6.66)),
      ),
      alignment: Alignment.center,
      height: 38,
      // margin: EdgeInsets.fromLTRB(24, 9, 9, 12),
      padding: EdgeInsets.only(left: 6, right: 6),
      child: TextField(
        controller: textController,
        maxLines: 1,
        focusNode: FocusNode(),
        autofocus: false,
        cursorColor: Colors.blue,
        onChanged: onChanged ?? (value){
          print("正在输入内容：$value");
        },
        onSubmitted: onSubmitted ?? (text){
          print('submit $text');
        },
        keyboardType: textInputType,
        textAlignVertical: TextAlignVertical.center, //添加图标后会有一个小的向上偏移
        decoration: InputDecoration(
            contentPadding: const EdgeInsets.only(left: -13),//内容内边距，影响高度
            hintText: hintText,
            border: InputBorder.none,
            isCollapsed: true, //相当于高度包裹的意思，必须设置为true，不然有默认奇妙的最小高度
            fillColor: Colors.white, //背景颜色，必须结合filled: true,才有效
            filled: true, //必须设置为true，fillColor才有效
            isDense:true,
            icon: Padding(padding: EdgeInsets.only(left: 3),child: Icon(Icons.search,size: 22,),),
            suffixIcon: GestureDetector(
              onTap: () {
                //addPostFrameCallback是 StatefulWidge 渲染结束的回调，只会被调用一次
                SchedulerBinding.instance!.addPostFrameCallback((_) {
                  textController!.text = "";
                });
              },
              child: Padding(
                padding: EdgeInsets.all(0),
                child: Icon(Icons.close,size: 23,),
              ),
            )
        ),
      ),
    );
  }
}

1. 使用方法

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SearchIow(
            textController: text,
            textInputType: TextInputType.text,
            onSubmitted: (value){
              print("$value");
            },
            onChanged: (value){
              print("$value");
            },
          ),

1. 效果如下，相信一定能帮到你。是不是很好用。好用给个三连支持一下，我会继续努力做出更好用的更好看的组件，让开发不在困难！！！

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