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Ariel Mejia
Ariel Mejia

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Open Successfully iOS Simulator with React Native & Expo

There are some downsides in the process to run IOS Simulator using Expo, here is a little guide to fix these issues:

Install X Code

Here a link to install
Xcode

Install Xcode Command Line Tools

This is a tricky section as at the first installation it looks like there is a Command Line Tools already selected, but it is not, you can find it in Xcode > Preferences > Locations so we need to click the option that appears to set the Command Line Tools path

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Install Watchman



brew update
brew install watchman


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Run Expo



npx expo start


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and press i to select ios simulator

Fixes

  • The easiest solution is to restart the computer.
  • The second solution is to delete node_modules folder and package-lock.json, then run npm install, then run npx expo start.

In Summary

The sections where most issues to run iOS Simulator are:

  • User has not select Command Line Tools
  • Sometimes previous attempts to make it run can produce issues, to avoid this just delete node_modules and re-run npm install.

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