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

Question

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?

Answer 1

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:...
)

Answer 2

The command flutter run --release compiles to release mode.

To remove "debug banner" you can use debugShowCheckedModeBanner property of MaterialApp() widget. If you set this property to false , banner will be disappeared.

class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
        return MaterialApp(
            home: HomePage(),
            debugShowCheckedModeBanner: false,
        );
    }
}