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iosxcodeflutter
Joshua de Guzman
Joshua de Guzman

Reputation: 2143

How to run Flutter app on multiple iOS simulators at the same time?

I tried running flutter run -d all, but I always get these errors:

s
    NULL
    ** BUILD FAILED **


Xcode's output:
↳
    note: Using new build system
    note: Building targets in parallel
    error: Build service could not start build operation: unknown error while handling message: Could not acquire

This command works if I try running both Android emulator and iOS simulator, but never for two or more iOS simulators at the same time.

Upvotes: 0

Views: 1282

Answers (1)

Joshua de Guzman
Joshua de Guzman

Reputation: 2143

There's a known issue in the Flutter SDK where it uses Xcode's latest build system, which prohibits the concurrent builds to run with a single flutter run command.

If you want to test your app against multiple devices at the same time, run the following:

  • flutter devices
  • flutter run -d <device_id_iphone> && flutter run -d <device_id_ipad>

The catch for this workaround is you have two isolated Flutter app instances running.

If you're running them on the command line, you have to reload each instance individually.

Upvotes: 2

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