Create-react-native-app: My 'npm run ios' script hang on 'Simulator.openUrlInSimulatorSafeAsync'

[miaojiuchen]

https://github.com/react-community/create-react-native-app/blob/05760c7b50d08bd753d933b9261e781aa91b0421/react-native-scripts/src/scripts/ios.js#L45

I got 'exp://localhost:19000' address

[miaojiuchen]

I have tried some solutions, such as sudo chmod -R 777 ~/.expo/
or restart my mac .etc.

They are all not work for me, any one can help?

[miaojiuchen]

https://github.com/expo/xdl/blob/ec7560e3d884afa02f728ac30a4a7f3a20ad2200/src/Simulator.js#L358

dig into the source code, I found it hangs on this function called '_installExpoOnSimulatorAsync'

[miaojiuchen]

Does it mean that the code is waiting for the installation of Expo on the simulator?

[miaojiuchen]

same issue: https://github.com/react-community/create-react-native-app/issues/107

[miaojiuchen]

I got the problem, The 'npm run ios' script wait for the download completion of 'https://dpq5q02fu5f55.cloudfront.net/Exponent-2.5.1.tar.gz', It's a 42mb file, and it cost about 5 minutes in china network, but it throws an timeout Exception about 1min later, so the script fails forever...

[miaojiuchen]

Finally solution:
download file : https://dpq5q02fu5f55.cloudfront.net/Exponent-2.5.1.tar.gz
extract it into ~/.expo/ios-simulator-app-cache
rename the Exponent-2.5.1 folder with a '.app' suffix
and excute the script 'npm run ios' again