1.1 Building an app in 5 minutes

• Requirement follow Getting Started
• Generate a new React Native project
  react-native init testRn

• Build & run project
  react-native run-ios

or open testRn/ios/testRn.xcodeproj and build with XCode's play button

or if the app already builded, start the webserver

npm start
//or
react-native start

原文: https://unbug.gitbooks.io/react-native-training/content/11_building_an_app_in_5_minutes.html