如何将BottomNavigationBar 与Navigator 一起使用?

问题描述

BottomNavigationBar 的 Flutter Gallery 示例在 Scaffold 的主体中使用了 FadeTransitions 的 Stack.

The Flutter Gallery example of BottomNavigationBar uses a Stack of FadeTransitions in the body of the Scaffold.

我觉得如果我们可以使用 Navigator 来切换页面会更干净(也更容易制作动画).

I feel it would be cleaner (and easier to animate) if we could switch pages by using a Navigator.

有这样的例子吗?

推荐答案

int index = 0;

@override
Widget build(BuildContext context) {
  return new Scaffold(
    body: new Stack(
      children: <Widget>[
        new Offstage(
          offstage: index != 0,
          child: new TickerMode(
            enabled: index == 0,
            child: new MaterialApp(home: new YourLeftPage()),
          ),
        ),
        new Offstage(
          offstage: index != 1,
          child: new TickerMode(
            enabled: index == 1,
            child: new MaterialApp(home: new YourRightPage()),
          ),
        ),
      ],
    ),
    bottomNavigationBar: new BottomNavigationBar(
      currentIndex: index,
      onTap: (int index) { setState((){ this.index = index; }); },
      items: <BottomNavigationBarItem>[
        new BottomNavigationBarItem(
          icon: new Icon(Icons.home),
          title: new Text("Left"),
        ),
        new BottomNavigationBarItem(
          icon: new Icon(Icons.search),
          title: new Text("Right"),
        ),
      ],
    ),
  );
}

您应该通过 Stack 保持每个页面以保持其状态.Offstage 停止绘画，TickerMode 停止动画.MaterialApp 包括 Navigator.

You should keep each page by Stack to keep their state.Offstage stops painting, TickerMode stops animation.MaterialApp includes Navigator.

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