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我正在尝试使用 iPhone 和模拟器运行我的应用程序。但是，该应用程序仅在一台设备上启动，当我尝试在另一台设备上运行该应用程序时，它们会出现错误：

有解决方案吗？它对开发至关重要......对我们来说最重要的功能。我们不能同时测试用户交互性或 UI 缩放，这真的很糟糕。

这是我尝试在 Android Studio 中运行应用程序时收到的错误。

Launching lib/main.dart on my’s iPhone in debug mode...
Signing iOS app for device deployment using developer identity: "Apple Development: test (AMNDNA32NX)"
Running Xcode build...
Xcode build failed due to concurrent builds, will retry in 2 seconds.
Xcode build failed due to concurrent builds, will retry in 4 seconds.
Xcode build failed due to concurrent builds, will retry in 8 seconds.
Xcode build failed due to concurrent builds, will retry in 16 seconds.
Xcode build failed due to concurrent builds, will retry in 32 seconds.

这是我的颤振医生

mac@my-iMac Flutter_myapp % flutter doctor -v
[✓] Flutter (Channel stable, 1.22.5, on Mac OS X 10.15.7 19H2 darwin-x64, locale en-GB)
    • Flutter version 1.22.5 at /Users/mac/Development/flutter
    • Framework revision 7891006299 (6 weeks ago), 2020-12-10 11:54:40 -0800
    • Engine revision ae90085a84
    • Dart version 2.10.4

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/mac/Library/Android/sdk
    • Platform android-30, build-tools 30.0.3
    • 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 12.0)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.0, Build version 12A7209
    • CocoaPods version 1.10.0

[!] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] Connected device (2 available)
    • SM M307F (mobile)        • RZ8MB2YKPDV                              • android-arm64 • Android 10 (API 29)
    • Paresh’s iPhone (mobile) • 49f62dac6f1da634e5d71981db4d591dc9126e4b • ios           • iOS 13.3

! Doctor found issues in 1 category.

在真实设备和模拟器上构建时似乎确实会出现此问题。在 iPhone iOS 14.3 和 iPhone 8 Simulator 中尝试过并得到同样的错误，但一次不会发生在一台设备上

有人找到它的解决方案吗？不能在多个 ios 模拟器上运行真的很烦人。

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1 回答 1

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这是一个相对常见的 Xcode 问题，当它的底层build.db被一些终止的 xcodebuild 进程锁定时，它发生在许多非 Flutter Xcode 项目中。我找到了一些解决方案来解决这个问题，这是他们的一些方法

  1. 从 Mac 活动监视器应用程序中退出XCBuildService 并重试

  2. 在构建 iOS 时退出 Xcode 应用程序或尝试关闭Xcode/Android Studio/VS Code

  3. 直接运行flutter run -d all --verbose 命令

  4. 尝试$ flutter clean 

  5. 通常删除 DerivedData 会修复它。

    ~/Library/Developer/Xcode/DerivedData

    DerivedData 是所有中间对象文件、缓存模块、代码索引、日志等所在的位置。如果我们从不同的派生数据目录运行每个构建，那么所有内容都将在每个构建上重新缓存，我预计这是一个相当严峻的性能代价。

于 2021-01-22T11:35:19.623 回答