Flutter Appbar UI設計

Question

如何創建這樣的應用欄？ 在 flutter 默認搜索按鈕中，我將不得不單擊 SearchIcon 稍后它將給出搜索選項卡，但我需要它就像發布的圖像一樣，以及搜索欄通知按鈕和導航抽屜。

Answer 1

試試下面的代碼希望它對你有幫助。 此處使用的badges package 用於顯示通知。

在此處參考TextFormField

在此處參考InputDecoration

Scaffold(
  appBar: AppBar(
    toolbarHeight: 80,
    title: Container(
      margin: EdgeInsets.only(
        top: 20,
        bottom: 20,
      ),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(
          10,
        ),
      ),
      child: TextFormField(
        decoration: InputDecoration(
          enabledBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.white,
            ),
            borderRadius: const BorderRadius.all(
              const Radius.circular(
                10.0,
              ),
            ),
          ),
          focusedBorder: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.white,
            ),
            borderRadius: const BorderRadius.all(
              const Radius.circular(
                10.0,
              ),
            ),
          ),
          hintText: 'Search petients,transcript,contacts',
          prefixIcon: Icon(
            Icons.menu,
          ),
          suffixIcon: Stack(
            children: [
              Container(
                padding: EdgeInsets.only(
                  top: 8,
                ),
                child: Icon(
                  Icons.notifications,
                  size: 30,
                ),
              ),
              Positioned(
                right: 15,
                child: Badge(
                  shape: BadgeShape.circle,
                  badgeColor: Colors.red,
                  borderRadius: BorderRadius.circular(
                    5,
                  ),
                  badgeContent: Text(
                    '2',
                    style: TextStyle(
                      color: Colors.white,
                    ),
                  ),
                ),
              ),
            ],
          ),
          border: OutlineInputBorder(
            borderRadius: BorderRadius.all(
              Radius.circular(
                10.0,
              ),
            ),
          ),
        ),
      ),
    ),
  ),
 );

您的結果屏幕->

Answer 2

import 'package:flutter/material.dart';

class SearchList extends StatefulWidget {
  SearchList({ Key key }) : super(key: key);
  @override
  _SearchListState createState() => new _SearchListState();

}

class _SearchListState extends State<SearchList>
{
  Widget appBarTitle = new Text("Search Sample", style: new TextStyle(color: Colors.white),);
  Icon actionIcon = new Icon(Icons.search, color: Colors.white,);
  final key = new GlobalKey<ScaffoldState>();
  final TextEditingController _searchQuery = new TextEditingController();
  List<String> _list;
  bool _IsSearching;
  String _searchText = "";

  _SearchListState() {
    _searchQuery.addListener(() {
      if (_searchQuery.text.isEmpty) {
        setState(() {
          _IsSearching = false;
          _searchText = "";
        });
      }
      else {
        setState(() {
          _IsSearching = true;
          _searchText = _searchQuery.text;
        });
      }
    });
  }

  @override
  void initState() {
    super.initState();
    _IsSearching = false;
    init();

  }

  void init() {
    _list = List();
    _list.add("Google");
    _list.add("IOS");
    _list.add("Andorid");
    _list.add("Dart");
    _list.add("Flutter");
    _list.add("Python");
    _list.add("React");
    _list.add("Xamarin");
    _list.add("Kotlin");
    _list.add("Java");
    _list.add("RxAndroid");
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      key: key,
      appBar: buildBar(context),
      body: new ListView(
        padding: new EdgeInsets.symmetric(vertical: 8.0),
        children: _IsSearching ? _buildSearchList() : _buildList(),
      ),
    );
  }

  List<ChildItem> _buildList() {
    return _list.map((contact) => new ChildItem(contact)).toList();
  }

  List<ChildItem> _buildSearchList() {
    if (_searchText.isEmpty) {
      return _list.map((contact) => new ChildItem(contact))
          .toList();
    }
    else {
      List<String> _searchList = List();
      for (int i = 0; i < _list.length; i++) {
        String  name = _list.elementAt(i);
        if (name.toLowerCase().contains(_searchText.toLowerCase())) {
          _searchList.add(name);
        }
      }
      return _searchList.map((contact) => new ChildItem(contact))
          .toList();
    }
  }

  Widget buildBar(BuildContext context) {
    return new AppBar(
        centerTitle: true,
        title: appBarTitle,
        actions: <Widget>[
          new IconButton(icon: actionIcon, onPressed: () {
            setState(() {
              if (this.actionIcon.icon == Icons.search) {
                this.actionIcon = new Icon(Icons.close, color: Colors.white,);
                this.appBarTitle = new TextField(
                  controller: _searchQuery,
                  style: new TextStyle(
                    color: Colors.white,

                  ),
                  decoration: new InputDecoration(
                      prefixIcon: new Icon(Icons.search, color: Colors.white),
                      hintText: "Search...",
                      hintStyle: new TextStyle(color: Colors.white)
                  ),
                );
                _handleSearchStart();
              }
              else {
                _handleSearchEnd();
              }
            });
          },),
        ]
    );
  }

  void _handleSearchStart() {
    setState(() {
      _IsSearching = true;
    });
  }

  void _handleSearchEnd() {
    setState(() {
      this.actionIcon = new Icon(Icons.search, color: Colors.white,);
      this.appBarTitle =
      new Text("Search Sample", style: new TextStyle(color: Colors.white),);
      _IsSearching = false;
      _searchQuery.clear();
    });
  }

}

class ChildItem extends StatelessWidget {
  final String name;
  ChildItem(this.name);
  @override
  Widget build(BuildContext context) {
    return new ListTile(title: new Text(this.name));
  }

}