lamp/.agents/skills/building-native-ui/references/gradients.md

CSS Gradients

New Architecture Only: CSS gradients require React Native's New Architecture (Fabric). They are not available in the old architecture or Expo Go.

Use CSS gradients with the experimental_backgroundImage style property.

Linear Gradients

// Top to bottom
<View style={{
  experimental_backgroundImage: 'linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 1) 100%)'
}} />

// Left to right
<View style={{
  experimental_backgroundImage: 'linear-gradient(to right, #ff0000 0%, #0000ff 100%)'
}} />

// Diagonal
<View style={{
  experimental_backgroundImage: 'linear-gradient(45deg, #ff0000 0%, #00ff00 50%, #0000ff 100%)'
}} />

// Using degrees
<View style={{
  experimental_backgroundImage: 'linear-gradient(135deg, transparent 0%, black 100%)'
}} />

Radial Gradients

// Circle at center
<View style={{
  experimental_backgroundImage: 'radial-gradient(circle at center, rgba(255, 0, 0, 1) 0%, rgba(0, 0, 255, 1) 100%)'
}} />

// Ellipse
<View style={{
  experimental_backgroundImage: 'radial-gradient(ellipse at center, #fff 0%, #000 100%)'
}} />

// Positioned
<View style={{
  experimental_backgroundImage: 'radial-gradient(circle at top left, #ff0000 0%, transparent 70%)'
}} />

Multiple Gradients

Stack multiple gradients by comma-separating them:

<View style={{
  experimental_backgroundImage: `
    linear-gradient(to bottom, transparent 0%, black 100%),
    radial-gradient(circle at top right, rgba(255, 0, 0, 0.5) 0%, transparent 50%)
  `
}} />

Common Patterns

Overlay on Image

<View style={{ position: 'relative' }}>
  <Image source={{ uri: '...' }} style={{ width: '100%', height: 200 }} />
  <View style={{
    position: 'absolute',
    inset: 0,
    experimental_backgroundImage: 'linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 50%)'
  }} />
</View>

Frosted Glass Effect

<View style={{
  experimental_backgroundImage: 'linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%)',
  backdropFilter: 'blur(10px)',
}} />

Button Gradient

<Pressable style={{
  experimental_backgroundImage: 'linear-gradient(to bottom, #4CAF50 0%, #388E3C 100%)',
  padding: 16,
  borderRadius: 8,
}}>
  <Text style={{ color: 'white', textAlign: 'center' }}>Submit</Text>
</Pressable>

Important Notes

• Do NOT use expo-linear-gradient — use CSS gradients instead
• Gradients are strings, not objects
• Use rgba() for transparency, or transparent keyword
• Color stops use percentages (0%, 50%, 100%)
• Direction keywords: to top, to bottom, to left, to right, to top left, etc.
• Degree values: 45deg, 90deg, 135deg, etc.