如何在颤动中处理后退时的切换页面逻辑

Question

我是flutter的新手，我通过onWillPop() 返回了按下事件以显示警告对话框。但我只需要显示主页的警报对话框（比如你想退出吗？）。在代码中，如果当前页面是主页，我有一个类似当前页面的类型，然后只显示警报对话框或切换到主页。

代码

if(currentType == Home)
{
    showExitDialog();
}
else
{
   switchToHome();
}

我在哪里可以处理这个？

Answer 1

在您的应用栏上设置自定义 leading 属性。

默认值是后退一页，所以如果你什么都不设置，后退箭头会在那里，它会Navigator.of(context).maybePop();

来自 Navigator 文档

If this is null and [automaticallyImplyLeading] is set to true, the [AppBar] will imply an appropriate widget. For example, if the [AppBar] is in a [Scaffold] that also has a [Drawer], the [Scaffold] will fill this widget with an [IconButton] that opens the drawer (using [Icons.menu]). If there's no [Drawer] and the parent [Navigator] can go back, the [AppBar] will use a [BackButton] that calls [Navigator.maybePop].

但如果您想覆盖它，请执行此操作

在您的主页上

  appBar: AppBar(
    leading: IconButton(icon: Icon(Icons.exit_to_app),onPressed: (){
      exitTheApp();
    },),
  ),

在您的其他 AppBar 上

  appBar: AppBar(
    leading: IconButton(icon: Icon(Icons.home),onPressed: (){
      showHomePage();
    },),
  ),

如何在颤动中处理后退时的切换页面逻辑

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