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class SearchBar extends StatefulWidget {
  SearchBar({Key? key, this.onChanged}) : super(key: key);
  final ValueChanged? onChanged;

  @override
  _SearchBarState createState() =>_SearchBarState();
}


class _SearchBarState extends State{

  final TextEditingController _textEditingController = TextEditingController();

  List_models = [];
  bool _showClear = false;

  void _onChanged(String text) {
    if (widget.onChanged != null) {
      widget.onChanged!(text);
    }
    setState(() {
      _showClear = text.isNotEmpty;
    });

  }


  @override
  Widget build(BuildContext context) {
    return Container(
      height: 84,
      color: Colors.indigoAccent,
      child: Column(
        children: [
          const SizedBox(
            height: 40,
          ),
          SizedBox(
            height: 44,
            child: Row(
              children: [
                Container(
                  width: 400,
                  height: 34,
                  margin: const EdgeInsets.only(left: 5, right: 5),
                  padding: const EdgeInsets.only(left: 5, right: 5),
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(6.0),
                  ),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Expanded(
                        child: TextField(
                          controller: _textEditingController,
                          cursorColor: Colors.green,
                          autofocus: true,
                          onChanged: _onChanged,
                          style: const TextStyle(
                            fontSize: 18.0,
                            color: Colors.black,
                            fontWeight: FontWeight.w300,
                          ),
                          decoration: const InputDecoration(
                            contentPadding: EdgeInsets.only(left: 5,bottom: 10),
                            border:InputBorder.none,
                            hintText:'搜索',
                          ),
                        ),
                      ),
                      if (_showClear) GestureDetector(
                        child: const Icon(
                          Icons.cancel,
                          size: 20,
                          color: Colors.grey,
                        ),
                        onTap: () {
                          _textEditingController.clear();
                          setState(() {
                            _onChanged("");
                          });
                        },
                      )
                    ],
                  ),
                ), //圆角背景
                GestureDetector(
                  child: const Text('取消'),
                  onTap: () {
                    
                  },
                ),
              ],
            ),
          ),
        ],
      ),
    );

  }
}

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文章标题：Flutter搜索框-创新互联
文章分享：http://myzitong.com/article/dhcjgs.html