Question

我的项目在1.10.0版本上运行良好，我已将flutter升级到新的1.12版，并且出现以下错误

编译器消息：

../../../AppData/Roaming/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-0.20.2/lib/src/platform_scaffold.dart:229:38: Error: The getter 'fullObstruction' isn't defined for the class 'ObstructingPreferredSizeWidget'.
 - 'ObstructingPreferredSizeWidget' is from 'package:flutter/src/cupertino/page_scaffold.dart' ('/C:/src/flutter/packages/flutter/lib/src/cupertino/page_scaffold.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'fullObstruction'.
      final obstruct = navigationBar.fullObstruction == null ||
                                     ^^^^^^^^^^^^^^^
../../../AppData/Roaming/Pub/Cache/hosted/pub.dartlang.org/flutter_platform_widgets-0.20.2/lib/src/platform_scaffold.dart:230:25: Error: The getter 'fullObstruction' isn't defined for the class 'ObstructingPreferredSizeWidget'.
 - 'ObstructingPreferredSizeWidget' is from 'package:flutter/src/cupertino/page_scaffold.dart' ('/C:/src/flutter/packages/flutter/lib/src/cupertino/page_scaffold.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'fullObstruction'.
          navigationBar.fullObstruction;
                    ^^^^^^^^^^^^^^^

目标kernel_snapshot失败：异常：创建快照时出错：null 构建失败。

再次将Flutter降级为1.10，该项目可以正常运行，但我需要升级到适用于webrtc库的1.12版本。有人可以帮助解决这个问题吗？

Answer 1

对于那些遇到此问题的人，我在这里提供了解决方案。这个问题花了我2天的时间，我一直不停地跳动，为什么即使我升级到Flutter v1.12.13 + hotfix.5-stable.zip的稳定版本，flutter包仍然显示错误？

解决方案： 上面的问题说，对于文件CupertinoPageScaffold.dart中的ObstructingPreferredSizeWidget类未定义fullObstruction。因此，我将文件放在了flutter包中的记事本中。原始路径是C：\ src2 \ flutter \ packages \ flutter \ lib \ src \ cupertino，src2是我的flutter软件包所在的文件夹。

在该文件中，我看到一个变量在较新版本中进行了更改，而不是在之前的变量下为fullObstruction，而是更改为bool shouldFullyObstruct（BuildContext context）;在较新的版本中。

abstract class ObstructingPreferredSizeWidget extends PreferredSizeWidget {
  /// If true, this widget fully obstructs widgets behind it by the specified
  /// size.
  ///
  /// If false, this widget partially obstructs.
  bool shouldFullyObstruct(BuildContext context);
}

然后我检查此错误发生在哪个文件中， C：\ src2 \ flutter.pub-cache \ hosted \ pub.dartlang.org \ flutter_platform_widgets-0.20.2 \ lib \ src \ platform-scaffold.dart

此行之前使用的是不赞成使用的变量fullObstruction，我用新变量替换了该变量并解决了问题，并且我的项目像以前一样正常工作。

final obstruct = navigationBar.shouldFullyObstruct（context）== null || navigationBar.shouldFullyObstruct（context）;

希望这对某人有帮助。

颤振升级导致未为类“ ObstructingPreferredSizeWidget”定义吸气剂“ fullObstruction”。错误

1 个答案: