问题
My Flutter Project won't run on the ios simulator and is throwing this error:
Launching lib/main.dart on iPhone Xʀ in debug mode...
Running Xcode build...
Xcode build done. 7.6s
Failed to build iOS app
Error output from Xcode build:
↳
** BUILD FAILED **
Xcode's output:
↳
=== BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
/bin/sh: /Users/pinercode/AndroidStudioProjects/bmi-calculator-flutter/packages/flutter_tools/bin/xcode_backend.sh: No such file or directory
Could not build the application for the simulator.
Error launching application on iPhone Xʀ.
The xcode error was also as follows:
/bin/sh: /Users/pinercode/AndroidStudioProjects/bmi-calculator-flutter/packages/flutter_tools/bin/xcode_backend.sh: No such file or directory
I've already tried running flutter doctor and there were no errors. I also tried re-rooting my xcode 'FLUTTER_ROOT' and 'FLUTTER_APPLICATION_PATH' in build settings, which did not work.
回答1:
Basically what happens is that one of the project's 'Build Phases' is running a script:
/bin/sh "$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build
Now in order to find xcode_backend.sh the FLUTTER_ROOT variable needs to be defined. It is defined in a file called Flutter/Generated.xcconfig, which is generated when you run flutter pub get or flutter build.
The build configuration files Debug.xcconfig and Release.xcconfig (in the same Flutter folder) include Generated.xcconfig.
Now the only thing left is to ensure that for each of the project configurations these build configuration files are properly set (in XCode unter Project > Info > Configuration).
回答2:
Setting runner to Generated in project->Info Configurations seemed to fix it. I can build in xcode now.
回答3:
after a lot of messing around, I set these two settings and the build ran on to my physical device.
Goto Xcode,
click on Runner
select Project (top one)
go to Info tab
change configurations for debug
top Runner (green icon) to 'Generated' Bottom Runner (red circles) 'Pods-Runner-debug'
回答4:
The simple solution was to call
flutter clean
flutter run
and then run the app from Xcode.
回答5:
If changing the configuration as suggested above doesn't fix things
In your Build Phase scripts / Xcode Project change
$FLUTTER_ROOT/packages/flutter_tools/...to
${FLUTTER_ROOT}/packages/flutter_tools/...Did the trick for me after the upgrade to the new version of flutter broke the Build.
来源：https://stackoverflow.com/questions/56844012/xcode-backend-sh-no-such-file-or-directory-do-i-need-to-create-this-file