React Native Introduction: Making Real iOS and Android Mobile App By JavaScript
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React Native is a new technology that allows building real mobile apps using only JavaScript. It is a JavaScript framework for writing, debugging, and deploying both iOS and Android mobile applications with native experience. React-Native allows developers to share about 80% of code between iOS and Android which make the development is 5x faster than traditional means. React-Native libraries are created by Facebook released in March 2015. It was proven by many world-class mobile applications, such as Facebook, Facebook Ads Manager, TaskRabbit, QQ, Discord, SoundCloud, etc.
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React Native Introduction: Making Real iOS and Android Mobile App By JavaScript
- 1. ITS485 Lecture 1: React Native Introduction Dr. Kobkrit Viriyayudhakorn iApp Technology Limited http://www.kobkrit.com
- 5. Grading Policy • Quizzes: 10% • At the beginning of the class (Always be on time). • Term Project: 20% • Midterm exam: 35% (Open Books) • Final exam: 35% (Open Books)
- 6. Term Project • Making a 5-10 Screens Mobile Application. • Group & Project Assignment after the midterm exam. • Set up a group of three. (36/3 = 12 groups) • 15% - Group scores - Usefulness, App Business Model, UI, UX, Functionality, Code Style, and Pitching. • 5% - Individual scores - App development questions target to each person during presentation. • 10 minutes presentation: Pitching 3 minutes, Code Explanation 2 minutes, Question & Answering 5 minutes.
- 7. Books & Reference • https://facebook.github.io/reactnative/ • Bonnie Eisenman, Learning React Native Building Native Mobile Apps with JavaScript, O'Reilly Media, December 2015. • https://github.com/jondot/awesome-react-native • https://js.coach/react-native/
- 9. What is React Native? • JavaScript framework for building iOS and Android mobile apps. • Based on popular JavaScript Web framework called React. • Created by Facebook. Firstly release iOS version on March 2015 and Android version on September 2015 • Writing the app by using JavaScript and XML-esque markup (JSX) • React-Native bridges and invokes the Native rendering API in Objective-C (iOS) and Java (Android)
- 10. Approach of Mobile App Dev. Approach Platform Logic UI UX Dev Time* Native Object C, Swift (iOS), Java (Android) Native Native Smooth 6-24 weeks HTML5 Hybrid PhoneGap, Cordova, Ionic JS HTML, CSS Laggy 2-8 weeks Native Hybrid React Native, NativeScript JS Native Smooth 2-8 weeks * 20-30 screens mobile apps approximated based on instructor experiences
- 11. Why React Native? • Native Experience • One language rules them all, JavaScript. • Fast & Great Development Experience • Don’t Waste Time Recompiling (Hot Reloading) • 80% Share code between Android & iOS • Great Debugging Tool using Chrome Developer Tools • Be able to bridge with Native Code when we need to.
- 13. Hot Reloading
- 14. Debugging with Chrome Developer Tools
- 15. Why not React Native? • React-Native is still relatively young compared with Native iOS and Android Communities (Released on 2015) • Some of Native API still are not supported. (But you can use the native libraries through) • Add one additional layer to mobile app project.
- 16. What is React? • Declarative, Efficient, and Flexible JavaScript Library that Building User Interface on Website. • React Native is rooted from React. • React treats every thing as a Component. A React Component
- 17. How React Native Works? • Q: How a Web framework (React) can be improved and become a Native Mobile Development Platform? • A: Flexibility of React’s Virtual DOM • React aimed to make Web application fast as much as possible. • DOM Changing (Changing the content of webpage) dynamically is expensive step. Re-rendering DOM is significant impact on performance. • Rather than directly render change DOM in the page, React compute the only diff that need to be render in memory by Virtual DOM and re-renders the minimal amount necessary.
- 18. Virtual Dom, Technique of React => Root of React Native
- 19. Another Benefits of Virtual DOM • Performance benefits. • Abstraction layers. • FB Engineer: What if React could render to a target other than the Web Browser’s DOM? • Instead of rendering HTML/CSS to the browser’s DOM. Why can’t we rendering mobile app by using Objective-C APIs to render to iOS, and invokes Java to render to Android.
- 21. Rendering Lifecycle Mounting Component Re-rendering Component
- 22. Async Rules • Good benefits of JavaScript is their asynchronous natures. • React-Native is running on separated thread using JavaScript asynchronous call via the event bridge to invokes the host native platform’s underlying APIs and UI elements. (Objective-C, Java) • Since, React-Native don’t run on the main UI rendering thread, it can do asynchronous call without impact user’s experience (such as delay).
- 23. Android Native UI Event Bridge JS World Android World Thread 1 Main Thread AsyncCall (Non-Blocking)
- 24. How React-Native Draw? • React for the Web, render normal HTML elements • React Native, render cross-platform (or platform- specific) native UI component. Cross Platform (iOS, Android) Platform Specific <DatePickerIOS>
- 25. Example of Platform Specific Components <Switch> <SwitchIOS><SwitchAndroid>
- 26. JSX • Combining JavaScript and XML-markup syntax to create view. • Single File Concept (Write down at Component Class), Not Seperate Files (Split HTML, CSS, JS) • Separation of concerns > Separation of technologies JSX (Underlined) Rendered View
- 27. Styling • In Web, We have CSS, necessary part of the Web. • In React-Native, We have something similar to CSS, called Flexbox Layout Model. { background-color : ‘white’} { backgroundColor : ‘white’} CSS Camel Case in React
- 29. React-Native Support • Mac OS can develop • iOS • Android • Windows OS can develop • Only Android
- 30. HomeBrew Installation • Open Terminal (Click on Find icon on the top right of the screen) • Type “Terminal” • Enter $ /usr/bin/ruby -e "$(curl -fsSL https:// raw.githubusercontent.com/Homebrew/install/ master/install)"
- 31. Install React-Native in Mac for iOS Development.
- 33. Try • $ react-native init sampleProject • $ cd sampleProject • $ react-native run-ios
- 34. IDE • Any Text Editor is fine. • Atom • React • React-Snippet • Atom-React-Native-CSS • Atom-React-Native- Autocomplete • Sublimes • Visual Studio Code
- 36. Download Lecture Note After Class & Video http://www.kobkrit.com