Spring and decay animations in React Native - UI Render Trace

Component - Spring and decay animations

This React Native component shows how spring and decay animations move a box smoothly. The spring animation bounces the box to a target position, while the decay animation slows it down naturally.

Widget Tree

View
├─ Animated.View
└─ View
   ├─ Button (Start Spring)
   └─ Button (Start Decay)

The root View holds the animated box (Animated.View) and two buttons below it. The buttons trigger spring and decay animations on the box.

Render Trace - 5 Steps

Step 1: View

Step 2: Animated.View

Step 3: View (Buttons container)

Step 4: Button (Start Spring)

Step 5: Button (Start Decay)

State Change - Re-render

Trigger:User taps 'Start Spring' or 'Start Decay' button

Before

animatedValue is at initial position (0)

→

After

animatedValue changes over time according to spring or decay animation

Re-renders:Animated.View re-renders to update box position smoothly

UI Quiz - 3 Questions

What happens when you tap the 'Start Spring' button?

A The box moves to a target position with a bouncing effect

B The box instantly jumps to the right without animation

C The box slowly fades out

D The box moves left and stops immediately

Key Insight

Using spring and decay animations in React Native lets you create natural, smooth movements that feel like real-world physics. Spring animations bounce to a target, while decay animations simulate slowing down naturally, improving user experience with lively feedback.