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React Nativemobile~10 mins

Animated.Value and Animated.timing in React Native - UI Render Trace

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Component - Animated.Value and Animated.timing

This React Native component shows how to animate a box moving horizontally using Animated.Value to hold the animation state and Animated.timing to change that value smoothly over time.

When you press the button, the box slides from the center to the right across the screen.

Widget Tree
View
├─ Animated.View
└─ Button
The root View holds two children: an Animated.View that is the moving box, and a Button that triggers the animation when pressed. The Animated.View uses the animated value to update its horizontal position.
Render Trace - 3 Steps
Step 1: View
Step 2: Animated.View
Step 3: Button
State Change - Re-render
Trigger:User presses the 'Move Box' button
Before
animatedValue is 0, so the box is centered horizontally
After
animatedValue animates to 200 over 1 second, moving the box right
Re-renders:Animated.View re-renders continuously during animation to update position
UI Quiz - 3 Questions
Test your understanding
What does Animated.Value represent in this component?
AA number that changes over time to animate the box position
BA static color value for the box
CA function to handle button presses
DA style property for the button
Key Insight
Using Animated.Value with Animated.timing lets you smoothly change UI properties over time. The animated value drives the visual changes, and React Native efficiently updates only the parts that depend on it, creating smooth animations without blocking the app.