文章目錄

• 一、報錯信息
• 二、解決方案

一、報錯信息

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報錯信息 :

Performing hot reload... Syncing files to device Pixel 2... Reloaded 0 libraries in 353ms.======== Exception caught by widgets library ======================================================= The following assertion was thrown building Text("動畫狀態 : null"): No Directionality widget found.RichText widgets require a Directionality widget ancestor.The specific widget that could not find a Directionality ancestor was: RichTextsoftWrap: wrapping at box widthmaxLines: unlimitedtext: "動畫狀態 : null"dirty The ownership chain for the affected widget is: "RichText ← Text ← Column ← Padding ← Container ← AnimationApp ← [root]"Typically, the Directionality widget is introduced by the MaterialApp or WidgetsApp widget at the top of your application widget tree. It determines the ambient reading direction and is used, for example, to determine how to lay out text, how to interpret "start" and "end" values, and to resolve EdgeInsetsDirectional, AlignmentDirectional, and other *Directional objects.The relevant error-causing widget was: Text file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:118:11 When the exception was thrown, this was the stack: #0 debugCheckHasDirectionality.<anonymous closure> (package:flutter/src/widgets/debug.dart:272:7) #1 debugCheckHasDirectionality (package:flutter/src/widgets/debug.dart:292:4) #2 RichText.createRenderObject (package:flutter/src/widgets/basic.dart:5539:37) #3 RenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5423:28) #4 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6166:11) ... ============================================================================================================ Exception caught by widgets library ======================================================= No Directionality widget found. The relevant error-causing widget was: Text file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:120:11 ============================================================================================================ Exception caught by rendering library ===================================================== A RenderFlex overflowed by 199358 pixels on the bottom. The relevant error-causing widget was: Column file:///D:/002_Project/002_Android_Learn/flutter_animation/lib/main.dart:96:14 ====================================================================================================

報錯組件 :

Text("動畫狀態 : $animationStatus"), Text("動畫值 : $animationValue"),

二、解決方案

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Flutter 中 Text 組件需要設置文本方向 ;

修改后的代碼為 :

Text("動畫狀態 : $animationStatus", textDirection: TextDirection.ltr,), Text("動畫值 : $animationValue", textDirection: TextDirection.ltr,),

總結

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