Book Image

React and React Native

By : Adam Boduch
Book Image

React and React Native

By: Adam Boduch

Overview of this book

para 1: Dive into the world of React and create powerful applications with responsive and streamlined UIs! With React best practices for both Android and iOS, this book demonstrates React and React Native in action, helping you to create intuitive and engaging applications. Para 2: React and React Native allow you to build desktop, mobile and native applications for all major platforms. Combined with Flux and Relay, you?ll be able to create powerful and feature-complete applications from just one code base. Para 3: Discover how to build desktop and mobile applications using Facebook?s innovative UI libraries. You?ll also learn how to craft composable UIs using React, and then apply these concepts to building Native UIs using React Native. Finally, find out how you can create React applications which run on all major platforms, and leverage Relay for feature-complete and data-driven applications. Para 4: What?s Inside ? Craft composable UIs using React & build Native UIs using React Native ? Create React applications for major platforms ? Access APIs ? Leverage Relay for data-driven web & native mobile applications
Table of Contents (34 chapters)
React and React Native
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface

Resizing images


The width and height style properties of Image components determine the size of what's rendered on the screen. For example, you'll probably have to work with images at some point that have a larger resolution than you want displayed in your React Native application. Simply setting the width and height style properties on the Image is enough to properly scale the image.

Let's look at some code that lets you dynamically adjust the dimensions of an image using a control:

import React, { Component } from 'react'; 
import { 
  AppRegistry, 
  View, 
  Text, 
  Image, 
  Slider, 
} from 'react-native'; 
import { fromJS } from 'immutable'; 
 
import styles from './styles'; 
 
class ResizingImages extends Component { 
  // The initial state of this component includes 
  // a local image source, and the width/height 
  // image dimensions. 
  state = { 
    data: fromJS({ 
      source: require...