ios - 有一个库比蒂诺导航来显示应用程序栏，但需要有结束抽屉

Question

我正在尝试CupertinoNavigationBar使用 endDrawer 添加，我尝试在尾随上添加手势检测器，但不起作用，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

我已经尝试将密钥添加到脚手架并尝试使用密钥打开，我也尝试使用 appbar 中的脚手架上下文

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 的尾随图标打开 endDrawer
Scaffold.of(context).openEndDrawer();

Answer 1

这是您尝试使用Scaffold.of(context). 您应该阅读错误日志。

从传递给的上下文开始，找不到 Scaffold 祖先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();
                },
              );
            },
          ),