How can I run release build of my Flutter app on Simulator

I need to take screenshots of my Flutter application across various devices. Since I do not have a variety of physical devices, I need to use the Simulator. However, I cannot figure out how to run my app in non-debug mode -- I always see the "Debug" banner in the top right corner. How can I run a Release build in the iOS Simulator?

When I try: flutter run --release, it says, "Release mode is not supported for emulators."

When I try: flutter install, it says:

[ +108 ms] An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=2):
                    Failed to install the requested application
                    An application bundle was not found at the provided path.
                    Provide a valid path to the desired application bundle.
[  +12 ms] "flutter install" took 4,601ms.
Install failed

Alternatively, can I run a debug build without showing the Debug banner?

Solution

You won't be able to run release mode on simulator as it only runs on actual device.

However you can remove the debug banner by passing debugShowCheckedModeBanner:false in your MaterialApp()

MaterialApp(
  debugShowCheckedModeBanner:false,
  home:...
)