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Expo BlurView iconExpo BlurView

一个会模糊视图下方所有内容的 React 组件。

Android
iOS
tvOS
Web
Included in Expo Go

GitHub

npm

更新日志

Bundled version:
~55.0.0

For the complete documentation index, see llms.txt. Use this Use this file to discover all available pages.

一个会模糊视图下方所有内容的 React 组件。它常用于导航栏、标签栏和模态框。

在 SDK 55 及更高版本中，expo-blur 在 Android 上已稳定，但要使 BlurView 正常工作，需要进行一些代码更改。请参阅 Android support 部分了解更多信息。

已知问题

当 BlurView 在动态内容使用（例如 FlatList）渲染之前渲染时，模糊效果不会更新。要修复此问题，请确保 BlurView 在动态内容组件之后渲染。例如：

<View>
  <FlatList />
  <BlurView />
</View>

安装

Terminal
- npx expo install expo-blur

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

用法

Basic iOS and web-only BlurView usage

这是创建 BlurView 的旧方式，这种方式只会在 iOS 上产生模糊效果。在 Android 上，这将导致一个带有半透明背景的视图。

Basic iOS-only BlurView usage
import { Text, StyleSheet, View } from 'react-native';
import { BlurView } from 'expo-blur';

export default function App() {
  const text = 'Hello, my container is blurring contents underneath!';
  return (
    <View style={styles.container}>
      <View style={styles.background}>
        {[...Array(20).keys()].map(i => (
          <View
            key={`box-${i}`}
            style={[styles.box, i % 2 === 1 ? styles.boxOdd : styles.boxEven]}
          />
        ))}
      </View>
      <BlurView intensity={100} style={styles.blurContainer}>
        <Text style={styles.text}>{text}</Text>
      </BlurView>
      <BlurView intensity={80} tint="light" style={styles.blurContainer}>
        <Text style={styles.text}>{text}</Text>
      </BlurView>
      <BlurView intensity={90} tint="dark" style={styles.blurContainer}>
        <Text style={[styles.text, { color: '#fff' }]}>{text}</Text>
      </BlurView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  blurContainer: {
    flex: 1,
    padding: 20,
    margin: 16,
    textAlign: 'center',
    justifyContent: 'center',
    overflow: 'hidden',
    borderRadius: 20,
  },
  background: {
    flex: 1,
    flexWrap: 'wrap',
    ...StyleSheet.absoluteFill,
  },
  box: {
    width: '25%',
    height: '20%',
  },
  boxEven: {
    backgroundColor: 'orangered',
  },
  boxOdd: {
    backgroundColor: 'gold',
  },
  text: {
    fontSize: 24,
    fontWeight: '600',
  },
});
带有 Android 支持的基本 BlurView 用法

要在 Android 上模糊视图的背景，请将要被模糊的内容包裹在 BlurTargetView 组件中，并将其 ref 传递给 BlurView。

注意： 请注意，只要所有 BlurView 都位于单个 BlurTargetView 的边界范围内，你就可以为多个 BlurView 复用同一个 BlurTargetView。这比创建多个 BlurTargetView 更高效。
Basic BlurView usage with Android support
import { BlurView, BlurTargetView } from 'expo-blur';
import { useRef } from 'react';
import { Text, StyleSheet, View } from 'react-native';

export default function App() {
  const targetRef = useRef<View | null>(null);
  const text = 'Hello, my container is blurring contents underneath!';

  return (
    <View style={styles.container}>
      <BlurTargetView ref={targetRef} style={styles.background}>
        {[...Array(20).keys()].map(i => (
          <View
            key={`box-${i}`}
            style={[styles.box, i % 2 === 1 ? styles.boxOdd : styles.boxEven]}
          />
        ))}
      </BlurTargetView>
      <BlurView
        blurTarget={targetRef}
        intensity={100}
        style={styles.blurContainer}
        blurMethod="dimezisBlurView">
        <Text style={styles.text}>{text}</Text>
      </BlurView>
      <BlurView
        blurTarget={targetRef}
        intensity={80}
        tint="light"
        style={styles.blurContainer}
        blurMethod="dimezisBlurView">
        <Text style={styles.text}>{text}</Text>
      </BlurView>
      <BlurView
        blurTarget={targetRef}
        intensity={90}
        tint="dark"
        style={styles.blurContainer}
        blurMethod="dimezisBlurView">
        <Text style={[styles.text, { color: '#fff' }]}>{text}</Text>
      </BlurView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  blurContainer: {
    flex: 1,
    padding: 20,
    margin: 16,
    textAlign: 'center',
    justifyContent: 'center',
    overflow: 'hidden',
    borderRadius: 20,
  },
  background: {
    flex: 1,
    flexWrap: 'wrap',
    ...StyleSheet.absoluteFill,
  },
  box: {
    width: '25%',
    height: '20%',
  },
  boxEven: {
    backgroundColor: 'orangered',
  },
  boxOdd: {
    backgroundColor: 'gold',
  },
  text: {
    fontSize: 24,
    fontWeight: '600',
  },
});

Android 支持

模糊功能在 Android 上已稳定。在迁移时需要注意以下几点：

API

要在 Android 上模糊视图的背景，请将要被模糊的内容包裹在 BlurTargetView 组件中，并将其 ref 传递给 BlurView。你可以在 用法 部分查看示例。

性能

只有通过使用 RenderNode Android API 才能高效实现模糊，该 API 在 Android SDK 31（Android 9.0）中引入。因此，在较旧版本的 Android 上，expo-blur 使用效率低得多的 RenderScript API。 如果你想避免在旧平台上的性能损耗，可以使用 dimezisBlurViewSdk31Plus BlurMethod ，它只会在较新的 Android 版本上执行模糊，并在旧版本上回退到 none。

API

import { BlurView } from 'expo-blur';

Components

BlurView

Android
iOS
tvOS
Web

Type: React.Component<BlurViewProps, BlurViewState>

BlurViewProps

blurMethod

Android
Optional • Type: BlurMethod • Default: 'none'

Blur method to use on Android.

blurReductionFactor

Android
Optional • Type: number • Default: 4

A number by which the blur intensity will be divided on Android.

When using experimental blur methods on Android, the perceived blur intensity might differ from iOS at different intensity levels. This property can be used to fine tune it on Android to match it more closely with iOS.

blurTarget

Android
Optional • Type: RefObject<View | null>

A ref to a BlurTargetView, which this BlurView will blur as its background.

intensity

Android
iOS
tvOS
Web
Optional • Type: number • Default: 50

A number from 1 to 100 to control the intensity of the blur effect.

You can animate this property using react-native-reanimated.

tint

Android
iOS
tvOS
Web
Optional • Type: BlurTint • Default: 'default'

A tint mode which will be applied to the view.

Inherited Props

BlurTargetView

Android
iOS
tvOS
Web

Type: React.Element<BlurTargetViewProps>

BlurTargetViewProps

ref

Android
iOS
tvOS
Web
Optional • Type: RefObject<View | null>

Inherited Props

Types

BlurMethod

Android

Literal Type: string

Blur method to use on Android.

  • 'none' - Renders a semi-transparent view instead of rendering a blur effect.

  • 'dimezisBlurView' - Uses a native blur view implementation based on BlurView library. This method may lead to decreased performance on Android SDK 30 and below.

  • 'dimezisBlurViewSdk31Plus' - Uses a native blur view implementation based on BlurView library on Android SDK 31 and above, for older versions of Android falls back to 'none'. This is due to performance limitations on older versions of Android, see the performance section to learn more.

Acceptable values are: 'none' | 'dimezisBlurView' | 'dimezisBlurViewSdk31Plus'

BlurTint

Android
iOS
tvOS
Web

Literal Type: string

Acceptable values are: 'light' | 'dark' | 'default' | 'extraLight' | 'regular' | 'prominent' | 'systemUltraThinMaterial' | 'systemThinMaterial' | 'systemMaterial' | 'systemThickMaterial' | 'systemChromeMaterial' | 'systemUltraThinMaterialLight' | 'systemThinMaterialLight' | 'systemMaterialLight' | 'systemThickMaterialLight' | 'systemChromeMaterialLight' | 'systemUltraThinMaterialDark' | 'systemThinMaterialDark' | 'systemMaterialDark' | 'systemThickMaterialDark' | 'systemChromeMaterialDark'

将 borderRadius 与 BlurView 一起使用

在 Android 和 iOS 上使用 BlurView 时，borderRadius 属性在显式提供时不会生效。要修复此问题，你可以使用 overflow: 'hidden' 样式，因为 BlurView 会继承 <View> 的属性。请参阅 用法 获取示例。