错误：位置参数太多：允许 1 个，但找到了 2 个。尝试删除额外的位置参数。 super.addToScene(builder, layerOffset);答案

【问题标题】：Error: Too many positional arguments: 1 allowed, but 2 found. Try removing the extra positional arguments. super.addToScene(builder, layerOffset);错误：位置参数太多：允许 1 个，但找到了 2 个。尝试删除额外的位置参数。 super.addToScene(builder, layerOffset);
【发布时间】：2021-12-18 09:52:56
【问题描述】：

从 2.5 升级到 Flutter 2.8 后出现此错误，运行 flutter clean 但无法解决
../../flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.0/lib/src/visibility_detector_layer.dart:276:21：错误：位置参数太多：允许1个，但是2 找到。尝试删除额外的位置参数。 super.addToScene(builder, layerOffset); 扑医生

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 2.8.1, on macOS 11.5.2 20G95 darwin-arm, locale en-KE)
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
[!] Xcode - develop for iOS and macOS (Xcode 13.2)
✗ CocoaPods installed but not working.
    You appear to have CocoaPods installed but it is not working.
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    being used to invoke it.
    This can usually be fixed by re-installing CocoaPods.
  To re-install see https://guides.cocoapods.org/using/getting-started.html#installation for
  instructions.
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! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[!] Android Studio
✗ Unable to find bundled Java version.
[✓] IntelliJ IDEA Community Edition (version 2021.3)
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! Doctor found issues in 3 categories.

颤振版本

Flutter 2.8.1 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 77d935af4d (2 days ago) • 2021-12-16 08:37:33 -0800
Engine • revision 890a5fca2e
Tools • Dart 2.15.1

代码在 2.5 上运行良好，直到升级

【问题讨论】：

试用0.2.2版
它也不适用于 visibility_detector-0.2.2

标签： flutter dart

【解决方案1】：

使用 visibility_detector 0.2.2。

【讨论】：

将 visibility_detector 添加到您的 pubspec.yaml：visibility_detector 0.2.2。然后运行，它应该可以工作
如果您使用的是 focus_detector，请将其升级到 2.0.1

【解决方案2】：

从 Flutter 安装路径打开以下文件。 flutter/.pub-cache/hosted/pub.dartlang.org/firexcode-1.0.8/lib/src/Modules/visibility_detector/visibility_detector_layer.dart
在第 276 行更新代码部分

来自

super.addToScene(builder, layerOffset);

到

super.addToScene(builder/*, layerOffset*/);

然后再次构建，它会工作。

【讨论】：

你正在编辑 pub，这是一种临时解决方案，不推荐使用，它会在 flutter clean 上消失
是的，我同意。希望它会在下一个颤振版本中得到修复。