Expo LinearGradient
渲染渐变视图的通用 React 组件。
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
- npx expo install expo-linear-gradientIf you are installing this in an existing React Native app, make sure to install expo in your project.
用法
¥Usage
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
Type: React.Component<LinearGradientProps>
Renders a native view that transitions between multiple colors in a linear direction.
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.
boolean • Default: trueEnables or disables paint dithering. Dithering can reduce the gradient color banding issue.
Setting false may improve gradient rendering performance.
unionFor 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
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
unionFor 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
Types
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:
| Property | Type | Description |
|---|---|---|
| x | number | A number ranging from |
| y | number | A number ranging from |