Book Image

UI Animations with Lottie and After Effects

By : Mireia Alegre Ruiz, Emilio Rodriguez Martinez
Book Image

UI Animations with Lottie and After Effects

By: Mireia Alegre Ruiz, Emilio Rodriguez Martinez

Overview of this book

Lottie is a small and scalable JSON-based animation file. LottieFiles is the platform where Lottie animations can be uploaded, tested, and shared. By combining the LottieFiles plugin and the LottieFiles platform, you’ll be able to create stunning animations that are easy to integrate in any device. You’ll also see how to use the Bodymovin plugin in After Effects to export your animation to a JSON file. The book starts by giving you an overview of Lottie and LottieFiles. As you keep reading, you’ll understand the entire Lottie ecosystem and get hands-on with classic 2D animation principles. You’ll also get a step-by-step guided tour to ideate, sketch for storytelling, design an icon that will fulfill the needs and expectations of users based on UX, and finally animate it in Adobe After Effects. This will help you get familiar with the After Effects environment, work with vector shape layers, create and modify keyframes using layer properties, explore path and mask features, and adjust timing easily to create professional-looking animations. By the end of this animation book, you’ll be able to create and export your own Lottie animations using After Effects and implement them in mobile apps using React Native. You’ll also have an understanding of 2D animation best practices and principles that you can apply in your own projects.
Table of Contents (16 chapters)
1
Part 1 - Building a Foundation With After Effects and LottieFiles
5
Part 2 - Cracking Lottie Animations
9
Part 3 - Adding Your Lottie Animations Into Mobile Apps

The declarative API

The most frequent explanation for the distinction between imperative and declarative programming is that imperative code instructs the computer on how to perform tasks, whereas declarative code concentrates on what you want the computer to do.

Your code in imperative programming is made up of statements that affect the program's state by instructing the computer what to do. To put it another way, your code is built around defining variables and altering their values.

Your code in declarative programming is made up of expressions that evaluate their output based on their input by telling the machine what you want.

React was designed following the declarative paradigm, although it allows you to control some components the imperative way when needed. So does lottie-react-native as it provides different APIs for imperative or declarative control on the animations rendered within an app.

In this section, we will focus on how to control the example animated...