我正在尝试使用Mac的ios模拟器来模拟我的Flutter应用程序，但出现此错误。在升级Android Studio和Xcode之前，它工作正常。
Launching lib/main.dart on iPhone X in debug mode...
Starting Xcode build...
Xcode build done.
Failed to build iOS app
Error output from Xcode build:
↳
** BUILD FAILED **
Xcode's output:
↳
error: Multiple commands produce '/Users/User/AndroidStudioProjects/my_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework':
1) Target 'Runner' has copy command from '/Users/User/AndroidStudioProjects/my_app/ios/Flutter/Flutter.framework' to '/Users/User/AndroidStudioProjects/my_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework'
2) That command depends on command in Target 'Runner': script phase “[CP] Embed Pods Frameworks”
warning: ignoring duplicated output file: '/Users/User/AndroidStudioProjects/my_app/build/ios/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework' (in target 'Runner')
note: Using new build systemnote: Planning buildnote: Constructing build description
Could not build the application for the simulator.
Error launching application on iPhone X.
使用：
应该固定在master频道中
https://github.com/flutter/flutter/issues/20685#issuecomment-421511890
解决方法
有两种解决方法：
- 选项1：使用旧版构建系统。如@ gi097所述，打开
ios/Runner.xcworkspace，并将构建系统更改为Legacy Build System。- 选项2：使用新的Xcode 10构建系统。
- 打开
ios/Runner.xcworkspaceRunner在项目导航器侧栏中选择项目。- 在主视图中，选择
Runner目标，然后选择Build Phases选项卡。- 扩展
Embed Frameworks阶段，然后Flutter.framework从嵌入式框架列表中进行选择。- 单击
-以Flutter.framework从列表中删除（请确保保留App.framework）。
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我来说两句