react-native run-ios can not find any simulator

[eric-PearSports]

Environment

React Native Environment Info:
System:
OS: macOS 10.14.2
CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
Memory: 6.76 GB / 32.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 10.15.0 - /usr/local/bin/node
Yarn: 1.13.0 - /usr/local/bin/yarn
npm: 6.4.1 - /usr/local/bin/npm
SDKs:
iOS SDK:
Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
IDEs:
Android Studio: 3.1 AI-173.4819257
Xcode: 10.1/10B61 - /usr/bin/xcodebuild
npmPackages:
react: 16.6.3 => 16.6.3
react-native: 0.57.8 => 0.57.8
npmGlobalPackages:
create-react-native-app: 1.0.0
react-native-cli: 2.0.1
react-native-git-upgrade: 0.2.7

Description

I have been facing an issue where 'react-native run-ios' can not start, regardless of the simulator I add to the --simulator argument.
XCode has the correct location for the 'command line tools'

I am always getting the error:
Could not find iPhone X simulator

Error: Could not find iPhone X simulator
    at resolve (/Users/eric/.../swim/node_modules/react-native/local-cli/runIOS/runIOS.js:149:13)
    at new Promise (<anonymous>)
    at runOnSimulator (/Users/eric/.../swim/node_modules/react-native/local-cli/runIOS/runIOS.js:134:10)
    at Object.runIOS [as func] (/Users/eric/.../swim/node_modules/react-native/local-cli/runIOS/runIOS.js:106:12)
    at Promise.resolve.then (/Users/eric/.../swim/node_modules/react-native/local-cli/cliEntry.js:117:22)

Reproducible Demo

Installed XCode from scratch.
Brand new 'react-native new app'

'react-native run-ios' always complain about not finding the simulator, regardless of the --simulator option.

My temporary fix is to change:
/node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

line 42, to:
if (!version.startsWith('**com.apple.CoreSimulator.SimRuntime.**iOS') && !version.startsWith('tvOS')) {

[react-native-bot]

It looks like you are using an older version of React Native. Please update to the latest release, v0.58 and verify if the issue still exists.

The "Resolution: Old Version" label will be removed automatically once you edit your original post with the results of running react-native info on a project using the latest release.

[eric-PearSports]

just tried a brand new project with:
react-native: 0.58.3 => 0.58.3

and same issue

[kelset]

1. Can you check which iOS simulator are installed on your machine?
2. You can always pass which simulator you want to target via the react-native run-ios —device=“XXXXXX’

[osunnarvik]

I have the same issue here as well.
When I changed to
if (!version.includes('iOS') && !version.includes('tvOS')) {
continue;
}

all is well, since the prefix "com.apple.CoreSimulator.SimRuntime." is included in the device-list, the pure check for startsWith fails for all simulators.

[osunnarvik]

I created pull request #23293 for this issue

[kelset]

Hey @osunnarvik thanks for creating the PR! Could you explain bit more (maybe in the PR) why is this happening now? I mean, when did the prefix changed? In latest Xcode? 🤔

[osunnarvik]

I have updated the description of the PR now to say a bit about when it startet happening and added some version information of XCode and xcrun

[eric-PearSports]

@kelset yes, I believe the format of the list of devices has changed with the latest XCode.

[kelset]

Awesome - thanks folks :)

We have already merged the PR to 0.58 (since 0.59 etc will have the CLI separated) and next patch release (0.58.4) will have the fix 💪

[osunnarvik]

@kelset I noticed the comment in react-native-community/cli#138 regarding when you specify the simulatorString (comment from @canterberry ). I only checked with empty simulatorString and not with one set. Let me know if you would like me to take a look at the case where the simulatorString is set.