React Native: Command `run-ios` unrecognized

Question

I have two different ReactNative-Projects:

• a) a project from januar 2016
• b) a complete new react-native project from now (march 20th 2016)

Answer 1

This may sound silly, but make sure you cd to your project directory. If that fails then perform the npm install in the other answers.

Answer 2

This happens when the project has an older version of react native. You can update the react version or for people who do not want to upgrade, just open the .xcodeproj file in iOS dir and hit the play button in the Xcode.

Answer 3

What caused this for me was running npm install --save [package] when actually the system has previously been using yarn instead of npm.

To solve this I just deleted the node_modules folder and ran: yarn install and after that react-native run-ios (or android) works fine.

Answer 4

I also fell in this error and the reason was
I was using yarn link command in wrong folder

Answer 5

Just update the version of react native in your project with the following command:

$> npm install --save react-native@latest

Answer 6

I found a solution that works for me. Update the version of react native in your project:

npm install --save react-native@latest 

then upgrade your npm version

npm i npm@latest -g

then move directory folder 1 level up, type

cd ..

make a new react-native installation folder

react-native init NewProject

then go to your project folder(NewProject), after that

react-native run-ios

should work fine.