Configuring animations Īnimations are heavily configurable. Because the entire configuration is declarative, we will be able to implement further optimizations that serialize the configuration and runs the animation on a high-priority thread. This is done in an optimized way that is faster than calling setState and re-rendering. Then, an easing animation is started on the fadeAnim animated value, which will update all of its dependent mappings (in this case, only the opacity) on each frame as the value animates to the final value of 1. When the component mounts, the opacity is set to 0. Behind the scenes, the numeric value is extracted and used to set opacity. The opacity property on the View is mapped to this animated value. In the FadeInView constructor, a new Animated.Value called fadeAnim is initialized as part of state. Animated focuses on declarative relationships between inputs and outputs, with configurable transforms in between, and start/ stop methods to control time-based animation execution.Īnimated exports six animatable component types: View, Text, Image, ScrollView, FlatList and SectionList, but you can also create your own using Animated.createAnimatedComponent().įor example, a container view that fades in when it is mounted may look like this: The Animated API is designed to concisely express a wide variety of interesting animation and interaction patterns in a very performant way. React Native provides two complementary animation systems: Animated for granular and interactive control of specific values, and LayoutAnimation for animated global layout transactions. Animations allow you to convey physically believable motion in your interface. Objects in motion have momentum and rarely come to a stop immediately. Stationary objects must overcome inertia as they start moving. To run the example app, you need to clone the repository and install dependencies.Animations are very important to create a great user experience. It shows similarities and differences between the React Native Text component implementation and the ResponsiveText from this library.Īll animations settings are applied only to the ResponsiveText, because the React native Text is not animated. This repository contains an interactive demo application to demonstrate how the ResponsiveText component works.
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