if you want to test your app in the ios simulator, all you need is to open the root folder of your app in terminal and run −

react-native run-ios

the above command will start the simulator and run the app.

we can also specify the device we want to use.

react-native run-ios --simulator "iphone 5s

after you open the app in simulator, you can press command + d on ios to open the developers menu. you can check more about this in our debugging chapter.

you can also reload the ios simulator by pressing command + r.