Expo LinearGradient iconExpo LinearGradient

渲染渐变视图的通用 React 组件。

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Web
Bundled version:
~14.1.5

expo-linear-gradient 提供了一个原生 React 视图,可以在线性方向上在多种颜色之间转换。

¥expo-linear-gradient provides a native React view that transitions between multiple colors in a linear direction.

安装

¥Installation

Terminal
npx expo install expo-linear-gradient

If you are installing this in an existing React Native app, make sure to install expo in your project.

用法

¥Usage

Linear Gradient
import { StyleSheet, Text, View } from 'react-native'; import { LinearGradient } from 'expo-linear-gradient'; export default function App() { return ( <View style={styles.container}> <LinearGradient // Background Linear Gradient colors={['rgba(0,0,0,0.8)', 'transparent']} style={styles.background} /> <LinearGradient // Button Linear Gradient colors={['#4c669f', '#3b5998', '#192f6a']} style={styles.button}> <Text style={styles.text}>Sign in with Facebook</Text> </LinearGradient> </View> ); } const styles = StyleSheet.create({ container: { flex: 1, alignItems: 'center', justifyContent: 'center', backgroundColor: 'orange', }, background: { position: 'absolute', left: 0, right: 0, top: 0, height: 300, }, button: { padding: 15, alignItems: 'center', borderRadius: 5, }, text: { backgroundColor: 'transparent', fontSize: 15, color: '#fff', }, });

API

import { LinearGradient } from 'expo-linear-gradient';

Component

LinearGradient

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Type: React.Component<LinearGradientProps>

Renders a native view that transitions between multiple colors in a linear direction.

LinearGradientProps

colors

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Type: readonly [ColorValue, ColorValue, [object Object][]]

A readonly array of colors that represent stops in the gradient. At least two colors are required (for a single-color background, use the style.backgroundColor prop on a View component).

For TypeScript to know the provided array has 2 or more values, it should be provided "inline" or typed as const.

dither

Android
Optional • Type: boolean • Default: true

Enables or disables paint dithering. Dithering can reduce the gradient color banding issue. Setting false may improve gradient rendering performance.

end

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Optional • Literal type: union

For example, { x: 0.1, y: 0.2 } means that the gradient will end 10% from the left and 20% from the bottom.

On web, this only changes the angle of the gradient because CSS gradients don't support changing the end position.

Acceptable values are: LinearGradientPoint | null

locations

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Optional • Literal type: union • Default: []

A readonly array that contains numbers ranging from 0 to 1, inclusive, and is the same length as the colors property. Each number indicates a color-stop location where each respective color should be located. If not specified, the colors will be distributed evenly across the gradient.

For example, [0.5, 0.8] would render:

  • the first color, solid, from the beginning of the gradient view to 50% through (the middle);
  • a gradient from the first color to the second from the 50% point to the 80% point; and
  • the second color, solid, from the 80% point to the end of the gradient view.

The color-stop locations must be ascending from least to greatest.

Acceptable values are: readonly [number, number, number[][]] | null

start

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Optional • Literal type: union

For example, { x: 0.1, y: 0.2 } means that the gradient will start 10% from the left and 20% from the top.

On web, this only changes the angle of the gradient because CSS gradients don't support changing the starting position.

Acceptable values are: LinearGradientPoint | null

Inherited Props

Types

LinearGradientPoint

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An object { x: number; y: number } or array [x, y] that represents the point at which the gradient starts or ends, as a fraction of the overall size of the gradient ranging from 0 to 1, inclusive.

Type: NativeLinearGradientPoint or object shaped as below:

PropertyTypeDescription
xnumber

A number ranging from 0 to 1, representing the position of gradient transformation.

ynumber

A number ranging from 0 to 1, representing the position of gradient transformation.

NativeLinearGradientPoint

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Tuple: [x: number, y: number]