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2.0 KiB
2.0 KiB
title, impact, impactDescription, tags
| title | impact | impactDescription | tags |
|---|---|---|---|
| Animate Transform and Opacity Instead of Layout Properties | HIGH | GPU-accelerated animations, no layout recalculation | animation, performance, reanimated, transform, opacity |
Animate Transform and Opacity Instead of Layout Properties
Avoid animating width, height, top, left, margin, or padding. These trigger layout recalculation on every frame. Instead, use transform (scale, translate) and opacity which run on the GPU without triggering layout.
Incorrect (animates height, triggers layout every frame):
import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated';
function CollapsiblePanel({ expanded }: { expanded: boolean }) {
const animatedStyle = useAnimatedStyle(() => ({
height: withTiming(expanded ? 200 : 0), // triggers layout on every frame
overflow: 'hidden',
}));
return <Animated.View style={animatedStyle}>{children}</Animated.View>;
}
Correct (animates scaleY, GPU-accelerated):
import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated';
function CollapsiblePanel({ expanded }: { expanded: boolean }) {
const animatedStyle = useAnimatedStyle(() => ({
transform: [{ scaleY: withTiming(expanded ? 1 : 0) }],
opacity: withTiming(expanded ? 1 : 0),
}));
return (
<Animated.View style={[{ height: 200, transformOrigin: 'top' }, animatedStyle]}>
{children}
</Animated.View>
);
}
Correct (animates translateY for slide animations):
import Animated, { useAnimatedStyle, withTiming } from 'react-native-reanimated';
function SlideIn({ visible }: { visible: boolean }) {
const animatedStyle = useAnimatedStyle(() => ({
transform: [{ translateY: withTiming(visible ? 0 : 100) }],
opacity: withTiming(visible ? 1 : 0),
}));
return <Animated.View style={animatedStyle}>{children}</Animated.View>;
}
GPU-accelerated properties: transform (translate, scale, rotate), opacity. Everything else triggers layout.