在 Vscode 中将 Dart SDK 从 2.10.3 更新到 2.12.0

Question

当我尝试在 flutter 中更新环境 sdk 时出现以下错误。

当前Dart SDK版本是2.10.3。

因为my_app要求SDK version >=2.12.0 <3.0.0，导致版本解析失败。 pub get failed (1; 因为my_app要求SDK version >=2.12.0 <3.0.0, version solving failed.) exit code 1

flutter doctor -v给我以下结果

[✓] Flutter (Channel beta, 2.2.0, on Mac OS X 10.15.7 19H2 darwin-x64, locale en-IN)
    • Flutter version 2.2.0 at /Users/mustafazaki/flutter
    • Framework revision b22742018b (4 weeks ago), 2021-05-14 19:12:57 -0700
    • Engine revision a9d88a4d18
    • Dart version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/mustafazaki/Library/Android/sdk
    • Platform android-29, build-tools 29.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.1, Build version 12A7403
    • CocoaPods version 1.10.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] VS Code (version 1.56.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.23.0

[✓] Connected device (3 available)
    
    • iPhone 12 Pro Max (mobile) • 67F57BF6-B6BC-4061-9BFD-01D38275C4E1 • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-14-1 (simulator)
    • Chrome (web)               • chrome                               • web-javascript • Google Chrome
      91.0.4472.77

• No issues found!

还有，为什么我在vscode上看不到最新的dart更新？ 它只显示 2.10.3

flutter clean似乎也不起作用。

Answer 1

您可能只需要在其 pubspec.yaml 文件中修改 Flutter 应用程序的目标 Dart 环境。 将环境部分更新为：

environment:
  sdk: ">=2.10.0 <3.0.0"

早在 2021 年的 Dart SDK 变更日志中就提到了它。另外，如果flutter upgrade不起作用。 尝试在命令中添加--force 。