React Native is a JavaScript framework for building native mobile apps. This tutorial is designed for JavaScript and React developers who aspire to learn. React Native Tutorial in PDF - Learn React Native in simple and easy steps starting from basic to advanced concepts with examples including Overview. The issue with React Native books is that the the material can get outdated pretty quickly, because the React Native ecosystem is still evolving. However key.

React Native Tutorial Pdf

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tutorial or two before coming back to take the plunge into mobile development. For example: “Learning React Native by Bonnie Eisenman. (O'Reilly). (Introduction to). REACT NATIVE Framework and tools to build native iOS and Android applications using React and JavaScript import { Image, ScrollView, StyleSheet, Text, View } from 'react-native'; Official intro+tutorial (pretty good). The topic chosen for this thesis is “Using the React Native framework for mobile software development”. The goal of this thesis is to demonstrate.

In App. In simple terms, it makes JavaScript better!

Learn the Basics

Component, the basic building block of the React UI. Components contain immutable properties, mutable state variables and expose a method for rendering.

Your current application is quite simple and only requires a render method. React Native components are not Android view classes; instead they are a lightweight equivalent. The framework takes care of transforming the tree of React components into the required native UI.

Then, get rid of the instructions assignment code block as you no longer need it. Save your changes to App. Then check Show All Proceses, select com.

Your text is being displayed in a view called ReactTextView: But what is that? Go to the project file finder and enter ReactTextView. Select the result matching this file to view the source code.

Curious as to how it all works? Take a quick look at MainActivity. The instance manager handles the communication between JavaScript and native Android. ReactRootView uses the instance manager to start the JavaScript application. The terminal window that was opened when you ran this application started a packager and server that allows your JavaScript code to be fetched, by default on port When your app starts, this code is loaded and executed by the JavaScriptCore library.

In the case of your application, it loads the App component, then constructs the native Android view. While your JavaScript code is perfectly readable in its present form, a more complex UI with nested elements would rapidly become quite a mess.

Make sure the app is still running, then return to your text editor to edit App. You can even skip having to refresh the app by enabling live reload.

Note that the emulator automatically refreshes to reflect your changes: Adding Navigation React Navigation is a community effort led by Facebook and Expo to provide an easy-to-use navigation solution for React Native apps. Save your changes and check the emulator to see the updated UI: Excellent — you now have the basic navigation structure in place.

Along with the style, you can very easily visualize the UI constructed by this component: a container with two text labels. Remove the SearchPage class and its associated description style from App.

Learn React Native

This may also be a good time to get rid of the all unused imports: those from react and react-native. React Native uses the Yoga library under the hood to drive layout. So far, your layout has a container with two children arranged vertically: This is due to the default flexDirection value of column being active.

Your app has set this value to center. This means the children are center-aligned. Open SearchPage. Yoga first lays out the text input and button according to their sizes. It then distributes the remaining space according to the flexGrow values. The text input therefore takes over the remaining space. Handling Assets The final step to complete the search screen of the application is to add the house graphic.

Download and unzip the images zip file.

Next, create a directory in your root project folder named Resources. Place the three images of the house in this directory. It also provides a single place for adding images if you are building for both iOS and Android. Back in SearchPage. Your task now is to add some state to your app and perform some actions. Adding Component State A React component can manage its internal state through an object called, you guessed it, state. Within SearchPage. This takes care of setting the initial state, but what happens when the user edits this text?

The first step is to create a method that acts as an event handler. This is an arrow function, another recent addition to the JavaScript language that provides a succinct syntax for creating anonymous functions. It also adds some logging code that will make sense shortly. Note: JavaScript classes do not have access modifiers, so they have no concept of private.

As a result you often see developers prefixing methods with an underscore to indicate that they should be considered private. You should see something like this: You call this. This triggers another render. You log the current and the next search text values. A React component state change triggers a UI update.

This de-couples the rendering logic from state changes affecting the UI. Most other UI frameworks put the onus on you to update the UI based on state changes. This is where React gets really smart.

Each time the UI renders itself, it takes the view tree returned by your render methods, and reconciles — or diffs — it with the current Android UI view. The output of this reconciliation process is a simple list of updates that React needs to apply to the current view.

That means only the things that have actually changed will re-render!

Getting Started

You can wrap your head around all that later; you still have some work to do in the app. In order to implement the search functionality you need to handle the Go button press, create a suitable API request, and provide a visual indication that a query is in progress.

This should kick off when the Go button is pressed. Similar to XML attributes, we pass in the props directly to a component and can then use the props inside the constructed component. Re-Render on Changes In addition to props, components can also have an internal state. The most prominent example of that behavior would be a click counter that updates its value when a button is pressed. The number of clicks itself would be saved in the state. Each of the prop and state change triggers a complete re-render of the component.

Virtual DOM Now when everything is re-rendered when the props or state changes, how come React itself is performing that well? The Virtual DOM consists of light representations of elements modeled after the component tree, making the process of generating them much more efficient than generating real DOM elements.

Before applying the changes to the real DOM, checks are done to determine where exactly in the component tree the changes happened, a diff is created, and only those specific changes are applied.

Getting Started with this React Native Tutorial There are certain prerequisites that beginners will need to set up in order to develop for React Native.

What helps is installing Watchman through the Brew package manager with brew install watchman. While this is not necessarily needed, it helps when dealing with a lot of files inside our React Native project. Tweet To install React Native, we simply need to install the React Native command-line application with npm install -g react-native-cli.

Calling the react-native command then helps us create a new React Native application. Running react-native init HelloWorld creates a folder called HelloWorld in which the boilerplate code can be found. We use some ES features in this code example, specifically classes. It is completely feasible to stick with React. Please click me. It is similar to the transition React developers had to go through when being confronted with JSX and previously using templating engines like Handlebars or Jade.

We declare the stylesheets directly at component level, and so we have all the information we need to see what our component does, the layout it creates, and the styles it applies.


There are different types of touchable components available, each of them providing a different visual feedback. Step 5: Customize Behavior Across Platforms It is possible to detect which platform the React Native application is running on, by accessing the value of Platform.

We can do it like this Step 6: Custom Fonts and react-native link In order to add a custom font, we need to jump through some hoops. After that, we need to create an assets folder and point npm to it.

Any other directory will do, but this is the conventional name used for the fonts directory. That will copy the fonts to the right directories and will add the necessary xml to info. Once done, we can use our font by just referencing it in any stylesheet by its full name. Those two properties control how the component is aligned respectively along its primary axis and its secondary axis. By default, the primary axis is the vertical one, and the secondary axis is the horizontal axis you can change that by setting the flexDirection property to row.

The first three behave like they do for justifyContent, while stretch will set the component to occupy all the available space along the axis, so that the axis will be completely filled.

Step 8: Registering the Application When developing with React for the browser, we just need to define a mount point, call React. In React Native, this is a little bit different.

React Native Tutorial in PDF

The name we give has to match with the name inside the Xcode project. Our Hello World React Native application has significantly more lines of code than its web counterpart, but on the other hand, React Native takes separation of concerns a bit further, especially because styles are defined with the component. It rebinds the method on every render call which can become quite a lot.

The alternative is to bind the method inside the constructor. Running the Application To run the application, we need to replace the contents of the index.

Then we just need to open the Xcode project and press the big Run button. First, a terminal will open with the React Native server, and then the simulator window will appear. The React Native server creates a bundle, which the native application will then fetch.

This allows for a web development-like rapid development cycle, where changes will be reflected almost instantly in the simulator. After the terminal has popped up, our application will then show up in the simulator. Clicking on the box will then show an alert.

The iOS version: And Android renders something like this: For distribution, having an application that points to a local development server would not be working out for us. This example application is also available on Github. Working with React Native Another thing worth mentioning is that we not only use React concepts and JavaScript for our mobile applications, but some of workflows web developers are used to are also available with React Native.

Advanced iOS Summer Bundle

When coming from web development, we are used to developer tools, inspecting elements, and live reloading. The way React Native works is that it puts all of our JavaScript files in a bundle.Go to the project file finder and enter ReactTextView. Great resources, free books with lot of notes about some programming technologies and languages Very good reference to learn new programming languages. Our Hello World React Native application has significantly more lines of code than its web counterpart, but on the other hand, React Native takes separation of concerns a bit further, especially because styles are defined with the component.

We're independent authors and we survive by making the highest quality book on React as possible. React Native uses a tool called Babel to automatically translate modern JavaScript into compatible legacy JavaScript where necessary.

So far, your layout has a container with two children arranged vertically: This is due to the default flexDirection value of column being active. You might also have noticed that a terminal window has popped up, displaying something like this: This is Metro Bundler , the React Native JavaScript bundler running under Node. In order to implement the search functionality you need to handle the Go button press, create a suitable API request, and provide a visual indication that a query is in progress.

Let us start by saying that React Native is a relatively new technology. Thanks to people like you?

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