flutter基础布局之 TabBar

主要内容有：TabBar、TabBarView、TabController、TabPageSelector。

It is typically not necessary to nest Scaffolds. For example, in a tabbed UI, where the bottomNavigationBar is a TabBar and the body is a TabBarView, you might be tempted to make each tab bar view a scaffold with a differently titled AppBar. Rather, it would be better to add a listener to the TabController that updates the AppBar

TabController(vsync: tickerProvider, length: tabCount)..addListener(() {if (!tabController.indexIsChanging) {setState(() {// Rebuild the enclosing scaffold with a new AppBar titleappBarTitle = 'Tab ${tabController.index}';});}
})

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