Running On Simulator

Starting the simulator

Once you have your React Native project initialized, you can run npx react-native run-ios inside the newly created project directory. If everything is set up correctly, you should see your new app running in the iOS Simulator shortly.

Specifying a device

You can specify the device the simulator should run with the --simulator flag, followed by the device name as a string. The default is "iPhone 13". If you wish to run your app on an iPhone SE (2nd generation), run npx react-native run-ios --simulator='iPhone SE (2nd generation)'.

The device names correspond to the list of devices available in Xcode. You can check your available devices by running xcrun simctl list devices from the console.

Specifying a version of device

If you have multiple iOS versions installed, you also need to specify its appropriate version. E.g. run npx react-native run-ios --simulator='iPhone 13 Pro (15.5)' in order to specify the iOS version.

Specifying an UDID

You can specify the device UDID returned from xcrun simctl list devices command. E.g. run npx react-native run-ios --udid='AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA'.