[Flutter]Exception caught by widgets library,Incorrect use of ParentDataWidgetの解決方法

2022年12月17日

Index

エラー内容

エラー発生時の画面

デバッガーを進めると以下のログが出るようになります。

エラーログ

════════ Exception caught by widgets library ═══════════════════════════════════
The following assertion was thrown while applying parent data.:
Incorrect use of ParentDataWidget.

The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject, which has been set up to accept ParentData of incompatible type BoxParentData.

Usually, this means that the Expanded widget has the wrong ancestor RenderObjectWidget. Typically, Expanded widgets are placed directly inside Flex widgets.
The offending Expanded is currently placed inside a Center widget.

The ownership chain for the RenderObject that received the incompatible parent data was:
  LimitedBox ← Container ← Expanded ← Center ← MyHomePage ← Semantics ← Builder ← RepaintBoundary-[GlobalKey#2518f] ← IgnorePointer ← AnimatedBuilder ← ⋯

════════ Exception caught by widgets library ═══════════════════════════════════

The following assertion was thrown while applying parent data.:

Incorrect use of ParentDataWidget.

The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject, which has been set up to accept ParentData of incompatible type BoxParentData.

Usually, this means that the Expanded widget has the wrong ancestor RenderObjectWidget. Typically, Expanded widgets are placed directly inside Flex widgets.

The offending Expanded is currently placed inside a Center widget.

The ownership chain for the RenderObject that received the incompatible parent data was:

LimitedBox ← Container ← Expanded ← Center ← MyHomePage ← Semantics ← Builder ← RepaintBoundary-[GlobalKey#2518f] ← IgnorePointer ← AnimatedBuilder ← ⋯

該当のコード

わかりやすくするため、コードを単純化してます。

  @override
  Widget build(BuildContext context) {
    // return SafeArea(child: Platform.isAndroid ? androidUI() : iosUI());
    return Center(
      child: Expanded(child: Container()),
    );

@override

Widget build(BuildContext context) {

// return SafeArea(child: Platform.isAndroid ? androidUI() : iosUI());

return Center(

child: Expanded(child: Container()),

);