anchor.diff:        );
   }
   
  -class _GSYTabBarState extends State<GSYTabBarWidget> with SingleTickerProviderStateMixin {
  +class _GSYTabBarState extends State<GSYTabBarWidget>
  +    with SingleTickerProviderStateMixin {
     final int _type;
   
     final List<Widget> _tabViews;
  
positive.code:               indicatorColor: _indicatorColor,
                onTap: (index) {
                  _onPageChanged?.call(index);
                  _pageController.jumpTo(MediaQuery.of(context).size.width * index);
                }),
          ),
          body: new PageView(
  
negative.code:         bottomNavigationBar: new Material(
            //为了适配主题风格，包一层Material实现风格套用
            color: Theme.of(context).primaryColor, //底部导航栏主题颜色
            child: new SafeArea(
              child: new TabBar(
                //TabBar导航标签，底部导航放到Scaffold的bottomNavigationBar中
                controller: _tabController, //配置控制器
                tabs: widget.tabItems,
                indicatorColor: _indicatorColor,
                onTap: (index) {
                  _onPageChanged?.call(index);
                  _pageController
                      .jumpTo(MediaQuery.of(context).size.width * index);
                }, //tab标签的下划线颜色
              ),
            ),
          ));
    }
  