Your app’s Debug and Release build configurations embed
the Debug or Release build modes of Flutter, respectively.
Add a Profile build configuration
to your app to test in profile mode.

Tip:
  Flutter.framework is the bundle for the Flutter engine,
  and App.framework is the compiled Dart code for this project.

Open MyApp.xcworkspace in Xcode.
You can now build the project using ⌘B.

Option B - Embed frameworks in Xcode

Alternatively, you can generate the necessary frameworks
and embed them in your application by manually editing
your existing Xcode project. You may do this if members of your
team can’t locally install Flutter SDK and CocoaPods,
or if you don’t want to use CocoaPods
as a dependency manager in your existing applications.
You must run flutter build ios-framework
every time you make code changes in your Flutter module.

The following example assumes that you want to generate the
frameworks to some/path/MyApp/Flutter/.