ios - 为什么 Flutter 的 CupertinoNavigationBar 与 CupertinoPageScaffold 中的子项重叠？

Question

我有以下小部件树:

@override
  Widget build(BuildContext context) {
    final double topMargin = Platform.isAndroid ? 0 : 105; // TODO: (why margin on iOS?)
    final double interMargin = Platform.isAndroid ? 0 : 10;
    final body = Column(children: <Widget> [
      Padding(
        padding: EdgeInsets.only(left: 10, right: 10, top: topMargin),
        child: Platform.isAndroid // url
        ? TextField(
            decoration: new InputDecoration(hintText: 'Host'),
            maxLines: 1,
            autofocus: true,
            textInputAction: TextInputAction.next,
            controller: _hostController)
        : CupertinoTextField(
            maxLines: 1,
            autofocus: true,
            textInputAction: TextInputAction.next,
            controller: _hostController)),
      Padding(
        padding: EdgeInsets.only(left: 10, top: interMargin, right: 10),
        child: Platform.isAndroid // port
          ? TextField(
              decoration: new InputDecoration(hintText: 'Port'),
              keyboardType: TextInputType.number,
              maxLines: 1,
              controller: _portController)
          : CupertinoTextField(
              keyboardType: TextInputType.number,
              maxLines: 1,
              controller: _portController)),
      Platform.isAndroid
        ? RaisedButton(child: Text('OK'), onPressed: () => _onInputFinished())
        : CupertinoButton(child: Text('OK'), onPressed: () => _onInputFinished())
    ]);
    return Platform.isAndroid
      ? Scaffold(
          appBar: AppBar(title: Text('Server connection')),
          body: body)
      : CupertinoPageScaffold(
          navigationBar: CupertinoNavigationBar(middle: Text('Server connection')),
          child: body);
  }

只有当我向主体小部件添加上边距时，它看起来才可以:

final double topMargin = Platform.isAndroid ? 0 : 105; // TODO: (why margin on iOS?)
...

如果我不添加它，CupertinoNavigationBar 会与子项重叠:

我错过了什么？

这是整个项目和 the screen .

Answer 1

您只需为您的 child 的小部件实现“SafeArea”小部件(而不是上边距)，以避免被库比蒂诺导航栏重叠。

CupertinoPageScaffold(
   navigationBar: CupertinoNavigationBar(),
   child: SafeArea(
            child: [Your widgets] // your children widgets 
        ),
)