Flutter 错误：键入'；ui.TextHeightBehavior'；未在颤振中找到

我在终端命令中构建appbundle时遇到了一个问题

编译器消息：

    ../../flutter/packages/flutter/lib/src/widgets/basic.dart:5149:9: Error: Type 'ui.TextHeightBehavior' not found.
      final ui.TextHeightBehavior textHeightBehavior;                       
            ^^^^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:149:9: Error: Type 'ui.TextHeightBehavior' not found.
      final ui.TextHeightBehavior textHeightBehavior;                       
            ^^^^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:432:9: Error: Type 'ui.TextHeightBehavior' not found.
      final ui.TextHeightBehavior textHeightBehavior;                       
            ^^^^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/rendering/paragraph.dart:78:5: Error: Type 'ui.TextHeightBehavior' not found.
        ui.TextHeightBehavior textHeightBehavior,                           
        ^^^^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/rendering/paragraph.dart:281:3: Error: Type 'ui.TextHeightBehavior' not found.
      ui.TextHeightBehavior get textHeightBehavior => _textPainter.textHeightBehavior;
      ^^^^^^^^^^^^^^^^^^^^^                                                 
    ../../flutter/packages/flutter/lib/src/rendering/paragraph.dart:282:26: Error: Type 'ui.TextHeightBehavior' not found.
      set textHeightBehavior(ui.TextHeightBehavior value) {                 
                             ^^^^^^^^^^^^^^^^^^^^^                          
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:145:5: Error: Type 'ui.TextHeightBehavior' not found.
        ui.TextHeightBehavior textHeightBehavior,                           
        ^^^^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:346:3: Error: Type 'ui.TextHeightBehavior' not found.
      ui.TextHeightBehavior get textHeightBehavior => _textHeightBehavior;  
      ^^^^^^^^^^^^^^^^^^^^^                                                 
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:347:3: Error: Type 'ui.TextHeightBehavior' not found.
      ui.TextHeightBehavior _textHeightBehavior;                            
      ^^^^^^^^^^^^^^^^^^^^^                                                 
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:348:26: Error: Type 'ui.TextHeightBehavior' not found.
      set textHeightBehavior(ui.TextHeightBehavior value) {                 
                             ^^^^^^^^^^^^^^^^^^^^^                          
    ../../flutter/packages/flutter/lib/src/painting/text_style.dart:1070:5: Error: Type 'ui.TextHeightBehavior' not found.
        ui.TextHeightBehavior textHeightBehavior,                           
        ^^^^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/widgets/basic.dart:5149:12: Error: 'TextHeightBehavior' isn't a type.
      final ui.TextHeightBehavior textHeightBehavior;                       
               ^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:149:12: Error: 'TextHeightBehavior' isn't a type.
      final ui.TextHeightBehavior textHeightBehavior;                       
               ^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:200:43: Error: 'TextHeightBehavior' isn't a type.
        properties.add(DiagnosticsProperty<ui.TextHeightBehavior>('textHeightBehavior', textHeightBehavior, defaultValue: null));
                                              ^^^^^^^^^^^^^^^^^^            
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:432:12: Error: 'TextHeightBehavior' isn't a type.
      final ui.TextHeightBehavior textHeightBehavior;                       
               ^^^^^^^^^^^^^^^^^^                                           
    ../../flutter/packages/flutter/lib/src/widgets/text.dart:487:43: Error: 'TextHeightBehavior' isn't a type.
        properties.add(DiagnosticsProperty<ui.TextHeightBehavior>('textHeightBehavior', textHeightBehavior, defaultValue: null));
                                              ^^^^^^^^^^^^^^^^^^            
    ../../flutter/packages/flutter/lib/src/rendering/paragraph.dart:78:8: Error: 'TextHeightBehavior' isn't a type.
        ui.TextHeightBehavior textHeightBehavior,                           
           ^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/rendering/paragraph.dart:282:29: Error: 'TextHeightBehavior' isn't a type.
      set textHeightBehavior(ui.TextHeightBehavior value) {                 
                                ^^^^^^^^^^^^^^^^^^                          
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:145:8: Error: 'TextHeightBehavior' isn't a type.
        ui.TextHeightBehavior textHeightBehavior,                           
           ^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:347:6: Error: 'TextHeightBehavior' isn't a type.
      ui.TextHeightBehavior _textHeightBehavior;                            
         ^^^^^^^^^^^^^^^^^^                                                 
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:348:29: Error: 'TextHeightBehavior' isn't a type.
      set textHeightBehavior(ui.TextHeightBehavior value) {                 
                                ^^^^^^^^^^^^^^^^^^                          
    ../../flutter/packages/flutter/lib/src/painting/text_painter.dart:422:7: Error: No named parameter with the name 'textHeightBehavior'.
          textHeightBehavior: _textHeightBehavior,                          
          ^^^^^^^^^^^^^^^^^^                                                
    org-dartlang-sdk:///flutter/lib/ui/text.dart:865:3: Context: Found this candidate, but the arguments don't match.
      ParagraphStyle({                                                      
      ^^^^^^^^^^^^^^                                                        
    ../../flutter/packages/flutter/lib/src/painting/text_style.dart:1070:8: Error: 'TextHeightBehavior' isn't a type.
        ui.TextHeightBehavior textHeightBehavior,                           
           ^^^^^^^^^^^^^^^^^^                                               
    ../../flutter/packages/flutter/lib/src/painting/text_style.dart:1091:7: Error: No named parameter with the name 'textHeightBehavior'.
          textHeightBehavior: textHeightBehavior,   

                        
      ^^^^^^^^^^^^^^^^^^                                                
org-dartlang-sdk:///flutter/lib/ui/text.dart:865:3: Context: Found this candidate, but the arguments don't match.
  ParagraphStyle({                                                      
  ^^^^^^^^^^^^^^                                                        
Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.                                                           
                                                                        
FAILURE: Build failed with an exception.    

                        
                                                                    

**这是我的颤振医生：**

[✓] 颤振（Mac OS X 10.15.2上的主通道，v1.14.7-pre.83 19C57，区域设置en ID） •颤振版本1.14.7-83之前at/Users/mac/颤振 •框架版本e10df3c1a6（两天前），2020-02-01 11:23:01+0800 •发动机版本e625e174c5 •Dart版本2.8.0（版本2.8.0-dev.6.0 5ae5aff640）

[✓] Android工具链-为Android设备开发（Android SDK 版本29.0.2） •Android SDK at/Users/mac/Library/Android/SDK •未配置Android NDK位置（可选；用于本机评测支持） •平台android-29，构建工具29.0.2 •Java二进制地址：/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/Java •Java版本OpenJDK运行时环境（build 1.8.0_202-release-1483-b49-5587405） •接受所有Android许可证

[✓] Xcode-为iOS和macOS开发（Xcode 11.3.1） •Xcode at/Applications/Xcode.app/Contents/Developer •Xcode 11.3.1，构建版本11C504 •CocoaPods版本1.8.4

[✓] Android Studio（3.5版） •Android Studio位于/Applications/Android Studio.app/Contents •颤振插件版本43.0.1 •Dart插件版本191.8593 •Java版本OpenJDK运行时环境（build 1.8.0_202-release-1483-b49-5587405）

[✓] IntelliJ IDEA社区版（2018.2.2版） •IntelliJ at/Applications/IntelliJ IDEA CE.app •颤振插件版本29.1.3 •Dart插件版本182.4129.13

以前我成功地将我的应用程序上传到Google Playstore。但是当我想更新我的应用程序时，我面临这个问题。在更改你的Flatter master之前谢谢你 在项目结束时写下

---

颤振通道稳定

您似乎正在使用旧的颤振

主

通道来修复升级到最新的

稳定

通道

要按照此命令切换频道，请执行以下操作：

flutter channel stable
flutter clean

然后跑

flutter upgrade       //to ensure you're on the latest.

---

在应用程序的pubspec.yaml文件中，查找以下行：flatter\u widget\u from\u html并使用^0.5.1+3版本

例如：

flatter\u小部件来自html:^0.5.1+3

---

然后点击Pub升级并运行你的应用程序

你能显示你的代码而不是错误吗？！请考虑修改你在这个问题中发布的代码示例。在这里发现一个内容问题；改进您的格式和代码示例，我（或其他人）很乐意恢复它。祝您的代码好运！

flutter upgrade       //to ensure you're on the latest.