react-native run-ios can not find any simulator

Environment

React Native Environment Info: System: OS: macOS 10.14.2 CPU: (12) x64 Intel® Core™ 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’)) {

[tedi]

It’s having issues doing the string search on the simulator version in node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js on this line: if (!version.startsWith('iOS').

I replaced it with includes as such: if (!version.includes('iOS') which seems to have solved the problem for me.

[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.