Xcode 15 issue related to Flutter 3 — Fix

Hi everyone you might have updated to the latest version of mac OS Sonoma which forced the updated of Xcode. You are not the only enthusiasitc person in the world, we all are guilty of it.

But this update came with a lot of unnecessary bugs which caused a lot of panic and sleepless nights for Flutter developers.

In this short article i will list down the two common errors that every Flutter app developer will get once updated to the latest version of the app.

Bug 1

Folder name change issue

This issue will be the first one that pops up when you run your Flutter app in the newest version of Xcode.

Fix

In order to solve this you can either manually search for the folder and replace all instance with TOOLCHAIN_DIR or you can write a pod script to automatically do the change every time you do pod install.

post_install do |installer|
  installer.aggregate_targets.each do |target|
      target.xcconfigs.each do |variant, xcconfig|
      xcconfig_path = target.client_root + target.xcconfig_relative_path(variant)
      IO.write(xcconfig_path, IO.read(xcconfig_path).gsub("DT_TOOLCHAIN_DIR", "TOOLCHAIN_DIR"))
      end
  end

 .......
 end
    installer.pods_project.targets.each do |target|
    flutter_additional_ios_build_settings(target)
    target.build_configurations.each do |config|
      if config.base_configuration_reference.is_a? Xcodeproj::Project::Object::PBXFileReference
        xcconfig_path = config.base_configuration_reference.real_path
        IO.write(xcconfig_path, IO.read(xcconfig_path).gsub("DT_TOOLCHAIN_DIR", "TOOLCHAIN_DIR"))
      end
    .....
  end
end

Bug 2

Error with Web kit and and Objective C

This issue took me three days to figure out and with the help of the github community we have the solution for this.

Fix

In order to solve this we need to add another pod script to make it work.

post_integrate do |installer|
  compiler_flags_key = 'COMPILER_FLAGS'
  project_path = 'Pods/Pods.xcodeproj'

  project = Xcodeproj::Project.open(project_path)
  project.targets.each do |target|
    target.build_phases.each do |build_phase|
      if build_phase.is_a?(Xcodeproj::Project::Object::PBXSourcesBuildPhase)
        build_phase.files.each do |file|
          if !file.settings.nil? && file.settings.key?(compiler_flags_key)
            compiler_flags = file.settings[compiler_flags_key]
            file.settings[compiler_flags_key] = compiler_flags.gsub(/-DOS_OBJECT_USE_OBJC=0\s*/, '')
          end
        end
      end
    end
  end
  project.save()
end

Once you have added this run the following commands

cd ios
rm podfile.lock
pod deintegrate
pod install --repo-update

if all this commands work properly, you can easily run the app without any issues.

Thats it…

Now you can easily fix your app for the latest version of Xcode.

Thanks for reading this article ❤️

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