debug狀態(tài)下可能有點卡,release情況下很完美

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

void main() {
  runApp(new MyApp());
  if (Platform.isAndroid) {
    // 以下兩行 設(shè)置android狀態(tài)欄為透明的沉浸。寫在組件渲染之后，是為了在渲染后進行set賦值，覆蓋狀態(tài)欄，寫在渲染之前MaterialApp組件會覆蓋掉這個值。
    SystemUiOverlayStyle systemUiOverlayStyle =
        SystemUiOverlayStyle(statusBarColor: Colors.transparent);
    SystemChrome.setSystemUIOverlayStyle(systemUiOverlayStyle);
  }
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
          primaryColorBrightness: Brightness.dark,
          platform: TargetPlatform.iOS),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() => HomeState();
}

class TabTitle {
  String title;
  int id;

  TabTitle(this.title, this.id);
}

class HomeState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  TabController mTabController;
  PageController mPageController = PageController(initialPage: 0);
  List<TabTitle> tabList;
  var currentPage = 0;
  var isPageCanChanged = true;

  @override
  void initState() {
    super.initState();
    initTabData();
    mTabController = TabController(
      length: tabList.length,
      vsync: this,
    );
    mTabController.addListener(() {//TabBar的監(jiān)聽
      if (mTabController.indexIsChanging) {//判斷TabBar是否切換
        print(mTabController.index);
        onPageChange(mTabController.index, p: mPageController);
      }
    });
  }

  initTabData() {
    tabList = [
      new TabTitle('推薦', 10),
      new TabTitle('熱點', 0),
      new TabTitle('社會', 1),
      new TabTitle('娛樂', 2),
      new TabTitle('體育', 3),
      new TabTitle('美文', 4),
      new TabTitle('科技', 5),
      new TabTitle('財經(jīng)', 6),
      new TabTitle('時尚', 7)
    ];
  }
  onPageChange(int index, {PageController p, TabController t}) async {
    if (p != null) {//判斷是哪一個切換
      isPageCanChanged = false;
      await mPageController.animateToPage(index, duration: Duration(milliseconds: 500), curve: Curves.ease);//等待pageview切換完畢,再釋放pageivew監(jiān)聽
      isPageCanChanged = true;
    } else {
      mTabController.animateTo(index);//切換Tabbar
    }
  }

  @override
  void dispose() {
    super.dispose();
    mTabController.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("首頁"),
        backgroundColor: Color(0xffd43d3d),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.all_inclusive),
        backgroundColor: Color(0xffd43d3d),
        elevation: 2.0,
        highlightElevation: 2.0,
        onPressed: () {},
      ),
      body: Column(
        children: <Widget>[
          Container(
            color: new Color(0xfff4f5f6),
            height: 38.0,
            child: TabBar(
              isScrollable: true,
              //是否可以滾動
              controller: mTabController,
              labelColor: Colors.red,
              unselectedLabelColor: Color(0xff666666),
              labelStyle: TextStyle(fontSize: 16.0),
              tabs: tabList.map((item) {
                return Tab(
                  text: item.title,
                );
              }).toList(),
            ),
          ),
          Expanded(
            child: PageView.builder(
              itemCount: tabList.length,
              onPageChanged: (index) {
                if (isPageCanChanged) {//由于pageview切換是會回調(diào)這個方法,又會觸發(fā)切換tabbar的操作,所以定義一個flag,控制pageview的回調(diào)
                  onPageChange(index);
                }
              },
              controller: mPageController,
              itemBuilder: (BuildContext context, int index) {
                return Text(tabList[index].title);
              },
            ),
          )
        ],
      ),
    );
  }
}