Flutter showBottomSheet 显示 No Scaffold widget found 异常

问题描述

报错描述

在flutter页面中使用点击事件 showBottomSheet 无效,控制台报错如下:

======== Exception caught by gesture ===============================================================
The following assertion was thrown while handling a gesture:
No Scaffold widget found.

MusicInfoPage widgets require a Scaffold widget ancestor.
The specific widget that could not find a Scaffold ancestor was: MusicInfoPage
  dependencies: [_LocalizationsScope-[GlobalKey#de178]]
  state: _MusicInfoPageState#63914
The ancestors of this widget were: 
  : GetMaterialApp
  : ScreenUtilInit
  : MyApp
  ...

Typically, the Scaffold widget is introduced by the MaterialApp or WidgetsApp widget at the top of your application widget tree.

示例报错代码

(垃圾csdn,代码块不支持dart)
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错误原因

出现这个异常的原因是showBottomSheet需要Scaffold这个部件的context,而我们传递给thiscontext并不是Scaffoldcontext,而是整个Widget本身的context

解决方案

第一种方案

showBottomSheet替换成showModalBottomSheet 就不会出现这个问题。

第二种方案

如果你的业务场景必须使用到showBottomSheet即可采取这种方案;
正如错误所说,我们只要把Scaffoldcontext传递给这个函数即可。我们可以为Scaffold生成一个全局key,并在其context中运行 showBottomSheet就ok啦。

上代码:

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