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by Soujanya PS
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I recently started to develop a React-Native app on iOS. This was my first foray into native app development. I was surprised by the ease and level of abstraction provided by React-Native’s command line interface. I was also curious to understand what happens under the hood when React-Native runs an app on a device or a simulator.
Debug App in Real Android Device using USB Connection. After developing the React Native App it is always a good idea to test it on the real device because many times an app behaves differently in the emulator then the real device. This post will cover How to Run React Native App On Real Device in Windows/Linux/Mac. Enable Debugging Over USB option. React Native for macOS. Build native macOS apps with React. See the official React Native website for an introduction to React Native. Best ftp mac app windows 10. React Native is a framework developed by Facebook that enables you to build world-class application experiences on native platforms using a consistent developer experience based on JavaScript and React.The focus of React Native is on developer efficiency. Create React Native App does a lot of work to make app setup and development simple and straightforward, but it's very difficult to do the same for deploying to Apple's App Store or Google's Play Store without relying on a hosted service.
I spent a lot of time going through the relevant code. There was no one place which summarized what React-Native does to get the app working. Partly, that was the motivation to come up with this piece. I want to help any other person who is starting off afresh with React-Native app development.
React-Native provides command line utilities to run an app on iOS and Andriod simulators/devices. Without further ado, let's try to understand the what and how of the process to run React-Native apps on iOS.
Behind the scenes
React-native provides this neat utility called
init
. It creates a native app template for you. This template creates the relevant Xcode project files under the iOS folder of the app.React-Native apps can be launched on iOS simulators/physical devices by running the following command in the root folder of an app:
Successful execution would open the app on a simulator or a connected device. For this to happen, there are a bunch of steps which are executed when we run the above command.
run-ios command
React-Native provides a number of command line utilities to work with the app. These can be found under the local-cli folder of the React-Native node module. run-ios is one such utility which invokes the
runIOS()
function defined in the runIOS.js file. run-ios accepts certain options such as:Device/Simulator selection
When no device is specified,
run-ios
would launch the app in Debug mode on a simulator by default. This is done by executing a series of xcrun simctl
commands. They would first check the list of available simulators on Mac, pick one among them, and then boot the selected simulator.![Run Android App Dev On Device Mac React Native Run Android App Dev On Device Mac React Native](/uploads/1/3/4/1/134110207/911420683.png)
Alternatively, if you wish to run the app on a physical device, plug the device to the Mac and then pass on the device details to the
run-ios
command.The next step is to build the Xcode project of the app.
Building App code
Usually, the React-Native app Xcode project can be found in the iOS folder present under the root folder. The Xcode project is built using the
xcodebuild
command. Any options specified to run-ios
such as the configuration etc. are passed on to this command.By default, the Xcode project is built in Debug scheme. Once the project is successfully built, the app is installed and launched on the simulator or the connected device.
App code bundling in Debug Mode
During the development process, React Native loads our JavaScript code dynamically at runtime. For this, we need a server to bundle our app code and provide it as needed.
While the Xcode project is being built in Debug mode, an instance of Metro server is also started in parallel. Metro is the bundler used by apps created by the React-Native command line interface (CLI). It is used to bundle our app code in development. How i can connect app on mac. This helps us with faster and easier debugging by enabling hot reloading etc.
Metro server is configured to start on port 8081 by default. Once the app is launched in the simulator, a request is sent to the server for the bundle.
The server then downloads all the required dependencies, bundles the JavaScript app code and sends it back to the app. After this step, you can see the app working on the simulator or a connected device.
App code bundling in Release Mode — Pre-packaging the JavaScript bundle
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In release mode, we have to pre-package the JavaScript bundle and distribute it inside our app. Doing this requires a code change so that it knows to load the static bundle. In AppDelegate.m file, change jsCodeLocation to point to the static bundle if you’re not in debug mode.
This will now reference the
main.bundle
resource file. This file is created during the Bundle React Native code and images
build Phase in Xcode. During this phase, react-native-xcode.sh
script is runwhich bundles the JavaScript app code. This script can be found under the React-Native node module’s scripts folder.Building the app from Xcode
Alternatively, the Xcode project can also be built within Xcode in Mac instead of using the React-Native CLI. Once done, the app can be launched on a simulator selected from the Xcode options or on a connected physical device.
I hope this helped you understand the various steps which happen when we run a simple
react-native run-ios
command which magically brings up an app on iOS.Run Android App Dev On Device Mac React Native Americans
Some parts of the information provided here have been sourced from the React-Native home page. The rest is a product of me snooping around the code :)
React Native becoming very popular among Android and iOS developer because of its cross platform native development technique. React native is now doing what is impossible few years back but now its a complete game changer technique, which would soon change the development arena and any one can developer both android and iOS apps using single language.
This tutorial is for all the beginners who is thinking to learn React Native. So using this tutorial you can complete your first task to install Install React Native on MAC ( MACINTOSH ) system and create your first React Native project and run that project in real iOS device or iOS emulator. If you use windows system then you can also read my this tutorial. So lets get started ? .
Step 1. Install Homebrew :
Homebrew is a type of platform dependency installation software which would allow us to install all the download and install all the required files. To install Homebrew open you terminal prompt and type the below command :
/usr/bin/ruby-e'$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)' |
Step 2. Install Node.js :
Next step is to install the node.js online using command.
Step 3. Install watchmen :
![Run Android App Dev On Device Mac React Native Run Android App Dev On Device Mac React Native](/uploads/1/3/4/1/134110207/776725056.jpeg)
Step 4. Install React Native CLI :
Step 5. install Xcode command line tools :
To install the latest version on Xcode you need to follow the below steps :
Open Xcode -> Preferences -> Locations tab -> install latest version of Xcode command line tools.
Step 6. Create your first react native project in MAC :
Step 7. Run your created project
2 | react-nativerun-ios |
Screenshot :
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Here you go guys, Now you have successfully created your first React Native project in MAC. To start editing your project just open the index.ios.js file. Feel free to share your thoughts via comments ? .