react-native: Similator is not found, Xcode and simulator installed and working properly.

Starting Metro Bundler on port 19004. Simulator is installed but is identified as ‘com.apple.CoreSimulator.SimulatorTrampoline’; don’t know what that is. Simulator not installed. Please visit https://developer.apple.com/xcode/download/ to download Xcode and the iOS simulator. If you already have the latest version of Xcode installed, you may have to run the command sudo xcode-select -s /Applications/Xcode.app.

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 42
Comments: 25 (1 by maintainers)

Links to this issue

Expo React-Native iOS Simulator not working - Stack Overflow

Commits related to this issue

Update README to avoid XCode issue Related issue is https://github.com/facebook/react-native/issues/23878 — committed to k-yokoishi/goobit by k-yokoishi 5 years ago

Most upvoted comments

Running open -a Simulator and then npm start fixed the issue.

+103

nahtnam on Mar 26, 2019

Please note this issue tracker is not a help forum (as stated in issue template).

We recommend using StackOverflow where there are community incentives to help others or our Discord channel for questions.

+30

cpojer on Mar 26, 2019

@nahtnam’s solution opens the simulator temporarily, but the next time you open it, you have to run both commands again as well. For now, I am aliasing start to open -a Simulator; expo start.

However, I hope a better solution will be found

+15

prigoose on Mar 26, 2019

@cpojer I think this should be re-opened. We aren’t asking for help, rather we are trying to report a bug.

+12

nahtnam on Mar 26, 2019

@cpojer there is a recent StackOverflow issue related. Only 47 views so far, but growing: https://stackoverflow.com/questions/55202064/expo-react-native-ios-simulator-not-working I’ll post any solution/workaround I find in there. This looks like a proper bug.

fozzarelo on Mar 26, 2019

I noticed XCode was updated recently. Could it be related to this? I am having this problem, with expo, using version 10.2 of XCode (SimulatorApp-880.5 CoreSimulator-587.35)

Anyone having this with a different version of XCode?

robrecord on Apr 1, 2019

I’ve noticed that Simulator is not gracefully exiting after closing. This is true whether or not I even run expo while it is open.

If I kill all the tasks named “Simulator” (which for some reason, cant use killall even thought they ar running as my user, have to kill -9those PIDs), then expo returns to working normally … until I close the Simulator again. Because I have to use -9 , _something _ is zombieing.

robbiemu on Mar 29, 2019

Same issue, running sudo xcode-select -s /Applications/Xcode.app does nothing, @nahtnam solution with opening simulator first from CLI is also not working, it gives me Operation timed out.

kubapyla on Mar 26, 2019

Just a followup, I’ve since upgraded to the 10.14.4 release, of course rebooted, and continued my development - I now can use killall. I have to do this with some frequency: nearly every time I introduce a coding error that halts recompile (like unmatched parenthesis, etc), pressing ‘r’ in the console running expo does not reiniitialize the build. The Simulator gets stuck with a red screen that won’t dismiss. if instead I relaunch the. app in ios, it goes to a blue screen but no rebuild occurs.

I am finding the best route to continue is to have two terminal tabs open, with these commands on tap:

expo r -c
killall Simulator && open -a Simulator

robbiemu on Apr 1, 2019