当我在 Flutter 中构建 Widget 时，我可以在没有 Scaffold 的情况下制作它吗？

Question

我正在尝试制作一个只有 webview 的应用程序。

1)。当我构建 Widget 时，我可以像下面的代码那样在没有 Scaffold 的情况下构建它吗？

2)。我什至想减少一帧。 如果我在没有脚手架的情况下进行构建，是否有助于减少框架？

还有 3)。我只制作网页视图，我也可以删除 SafeArea 吗？

return Container(

    child: SafeArea(

         child: WebView(
            ..
         ),
    )
);

}

Answer 1

尽快回答您的问题：

1. 如果您的小部件是需要Material 父小部件的小部件（例如TextField），则需要Scaffold 或Material 小部件。如果您的小部件不是，则否。

   如果您省略 Material 父小部件，则会发生错误（有关详细信息，请参阅帖子末尾）。

2. 在这种情况下，由于您的小部件是 WebView（我假设它来自此包 webview_flutter），因此您不需要 Scaffold。

3. 你可以像这样简单地使用它：

import 'dart:io';
import 'package:webview_flutter/webview_flutter.dart';

class WebViewExample extends StatefulWidget {
  @override
  WebViewExampleState createState() => WebViewExampleState();
}

class WebViewExampleState extends State<WebViewExample> {
  @override
  Widget build(BuildContext context) {
    return WebView(
      initialUrl: 'https://flutter.dev',
    );
  }
}

P/s：省略 Material 父级时的错误如下：

I/flutter ( 5187): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
I/flutter ( 5187): The following assertion was thrown building InputDecorator(decoration: InputDecoration(hintText:
I/flutter ( 5187): "Type something"); baseStyle: null; isFocused: false; isEmpty: true; dirty):
I/flutter ( 5187): No Material widget found.
I/flutter ( 5187): InputDecorator widgets require a Material widget ancestor.
I/flutter ( 5187): In material design, most widgets are conceptually "printed" on a sheet of material. In Flutter's
I/flutter ( 5187): material library, that material is represented by the Material widget. It is the Material widget
I/flutter ( 5187): that renders ink splashes, for instance. Because of this, many material library widgets require that
I/flutter ( 5187): there be a Material widget in the tree above them.
I/flutter ( 5187): To introduce a Material widget, you can either directly include one, or use a widget that contains
I/flutter ( 5187): Material itself, such as a Card, Dialog, Drawer, or Scaffold.