ios - 有一个 Cupertino 导航来显示应用程序栏，但需要有结束抽屉

Question

我正在尝试使用 endDrawer 添加 CupertinoNavigationBar，我尝试在尾部添加 Gesture Detector，但没有用，显示如下:

The following assertion was thrown while handling a gesture:
flutter: `Scaffold.of()` called with a context that does not contain a Scaffold.
flutter: No Scaffold ancestor could be found starting from the context that was passed to `Scaffold.of()`. This
flutter: usually happens when the context provided is from the same StatefulWidget as that whose build

我已经尝试将 key 添加到脚手架并尝试使用 key 打开，我也尝试在应用栏中使用脚手架上下文

应用栏:

Scaffold(
      appBar: CupertinoNavigationBar(
    transitionBetweenRoutes: true,
    trailing: IconButton(
    icon: Icon(Icons.menu),
    onPressed: () { 
        Scaffold.of(context).openEndDrawer();
    },),
    actionsForegroundColor: Colors.white,
    middle: Text('Lejour', style: TextStyle(color: Colors.white)),
          backgroundColor: Theme.of(context).primaryColor),
   endDrawer: DrawerMenu() // my own class,
   body: // ...body

我希望 CupertinoNavigationBar 的尾随图标用
打开 endDrawerScaffold.of(context).openEndDrawer();

Answer 1

当您尝试使用 Scaffold.of(context) 时，这是一个常见问题。您应该阅读错误日志。

No Scaffold ancestor could be found starting from the context that was passed to Scaffold.of()

要解决您的问题，请使用 Builder 小部件生成新的上下文。

trailing: Builder(
            builder: (context) {
              return IconButton(
                icon: Icon(Icons.menu),
                onPressed: () {
                  Scaffold.of(context).openEndDrawer();
                },
              );
            },
          ),