颤振中没有名称为“nullOk”的命名参数错误

Question

在遇到可怕的问题后，我通过将我的项目传递给另一个项目来完成。但是现在它在尝试运行我的程序后给了我这个错误。这是我以前从未见过的。而且，我没有编辑这些代码，因为它们是库。

../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart:147:57: Error: No named parameter with the name 'nullOk'.
    final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
                                                        ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
  static ScaffoldState of(BuildContext context) {
                       ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/app_bar.dart:32:57: Error: No named parameter with the name 'nullOk'.
    final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
                                                        ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
  static ScaffoldState of(BuildContext context) {
                       ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/text_field.dart:953:32: Error: No named parameter with the name 'nullOk'.
        MediaQuery.of(context, nullOk: true)?.navigationMode ??
                               ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
  static MediaQueryData of(BuildContext context) {
                        ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/neumorphic/theme.dart:390:52: Error: No named parameter with the name 'nullOk'.
      _cupertinoOverrideTheme.resolveFrom(context, nullOk: nullOk),
                                                   ^^^^^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart:147:57: Error: No named parameter with the name 'nullOk'.
    final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
                                                        ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
  static ScaffoldState of(BuildContext context) {
                       ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/app_bar.dart:32:57: Error: No named parameter with the name 'nullOk'.
    final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
                                                        ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/material/scaffold.dart:1918:24: Context: Found this candidate, but the arguments don't match.
  static ScaffoldState of(BuildContext context) {
                       ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/components/text_field.dart:953:32: Error: No named parameter with the name 'nullOk'.
        MediaQuery.of(context, nullOk: true)?.navigationMode ??
                               ^^^^^^
../../Developer/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
  static MediaQueryData of(BuildContext context) {
                        ^^
../../Developer/flutter/.pub-cache/hosted/pub.dartlang.org/neumorphic-0.4.0/lib/src/neumorphic/theme.dart:390:52: Error: No named parameter with the name 'nullOk'.
      _cupertinoOverrideTheme.resolveFrom(context, nullOk: nullOk),


    Command PhaseScriptExecution failed with a nonzero exit code
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description

Could not build the precompiled application for the device.
                                                   ^^^^^^

这是我的 pubspec.yaml

name: Test


environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  rflutter_alert: ^1.0.3
  flutter:
    sdk: flutter
  mqtt_client: ^8.0.0
  provider: ^4.3.2+2
  get_it: ^5.0.1
  vibration: ^1.7.2
  clay_containers: ^0.2.2
  local_auth: ^0.6.2+1
  flutter_secure_storage: ^3.3.3
  neumorphic: ^0.4.0
  shared_preferences: ^0.5.8
  flutter_neumorphic: ^3.0.3
  cupertino_icons: ^0.1.3

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:
  uses-material-design: true
  assets:
    - images/homestadelogo.png
    - images/morning.png
  fonts:
    - family: OpenSans
      fonts:
        - asset: fonts/assets/fonts/OpenSans.ttf
    - family: myLamp
      fonts:
        - asset: fonts/assets/fonts/mylamp.ttf

我该怎么办？如果您需要更多详细信息，请询问我。

Answer 1

nullOk作为迁移后空安全的一部分，几个参数已被删除。您可以阅读有关相应设计文档及其即将发布的迁移指南的更多信息。

TL;DR 你可以尝试使用.maybeOf(context)而不是.of(context, nullOk: true);

您可能必须更新您的依赖项才能使其正常工作。

Answer 2

经过大量的努力，我找到了一个成功的答案来消除这个错误。

如果您在pubspec.yaml 中添加了 SVG 依赖项，那么您已将其替换为

flutter_svg: ^0.20.0-nullsafety.3

Answer 3

如果您使用的是neumorphic，

定位，

home/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart

搜索，

最终 ScaffoldState scaffold = Scaffold.maybeOf(context);

尝试使用， .maybeOf(context);而不是.of(context, nullOk: true);

Answer 4

我终于设法解决了我的问题。对于我的情况，这不可能是你的情况，我删除了“build”文件夹，然后运行它而不做任何事情。然后 flutter 自动再次创建该文件。我个人在 Android Studio 上找不到“build”。所以我在 VSCode 上运行它，显示了该文件夹。所以尝试一下吧。