react-native run-ios can not find any simulator

Question

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)

react-native info

>   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

Answer 1

Update

It is fixed in v1.9.8.

Update cli is the easy solution

npm install -g react-native-cli@latest

---

This issue is fixed but not released yet. https://github.com/react-native-community/react-native-cli/pull/274

So it can be solved temporarily to fix the file below.

/node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

Change this line

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {

to

if (!version.includes('iOS') && !version.includes('tvOS')) {

Do not forget apply this again when you reinstall packages.

Answer 2

I tried like below

Open Xcode. Then Preferences -> Select Components in Tabs.

Then install any one(or more) of the available simulators on the list. Preferably the recent one at the top.

It solves the problem.

Answer 3

I've found a temporary fix:

In the following file:

/node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

...change line 42 to:

if (!version.startsWith('com.apple.CoreSimulator.SimRuntime.iOS') && !version.startsWith('tvOS')) {