flutter - 无法在 flutter 中使用 BottomNavigationBar 的项目属性

Question

我正在尝试在我的 flutter 项目中使用 BottomNavigationBar 并且我想向它提供项目。为此，我必须使用 items 属性。但是我无法在 BottomNavigationBar 中找到 items 属性。请看附图。

完整代码如下:

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance
    // as done by the _incrementCounter method above.
    // The Flutter framework has been optimized to make rerunning
    // build methods fast, so that you can just rebuild anything that
    // needs updating rather than having to individually change
    // instances of widgets.
    return new Scaffold(
      appBar: new AppBar(
        // Here we take the value from the MyHomePage object that
        // was created by the App.build method, and use it to set
        // our appbar title.
        title: new Text(config.title),
      ),
      bottomNavigationBar: new BottomNavigationBar(
        currentIndex: 0,
        onTap: (value){

        },
      ),
      // a style that looks nicer for build methods.
    );
  }
}

Answer 1

你确定你有最新版本的flutter吗？据我所知，目标标签已切换到 2016 年 12 月提交的项目: https://github.com/flutter/flutter/commit/1b9939af9547513061d2e30716f182b490f5362b#diff-f907c739b721784b11a7fec0459d384f