281 lines
7.4 KiB
Markdown
281 lines
7.4 KiB
Markdown
# `@react-native-community/blur`
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[](https://badge.fury.io/js/%40react-native-community%2Fblur)
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A component for UIVisualEffectView's blur and vibrancy effect on iOS, and [500px-android-blur](https://github.com/500px/500px-android-blur) on Android.<br>
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<img src='https://cloud.githubusercontent.com/assets/139536/25066337/3c9d44c0-224d-11e7-8ca6-028478bf4a7d.gif' />
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### Content
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- [Installation](#installation)
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- [BlurView](#blurview)
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- [VibrancyView](#vibrancyview)
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- [Example React Native app](#example-react-native-app)
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- [Questions?](#questions)
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### Installation
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1. Install package via npm:
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```
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npm install react-native-blur
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```
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2. Link your native dependencies:
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```
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react-native link react-native-blur
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```
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3. (Android only) Add the following to `android/app/build.gradle`
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```
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android {
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// make sure to use 23.0.3 or greater
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buildToolsVersion '23.0.3'
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// ...
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defaultConfig {
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// Add these lines below the existing config
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renderscriptTargetApi 23
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renderscriptSupportModeEnabled true
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}
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}
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```
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4. (Android only, optional)
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If you've defined _[project-wide properties](https://developer.android.com/studio/build/gradle-tips.html)_ (**recommended**) in your root `build.gradle`, this library will detect the presence of the following properties:
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```groovy
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buildscript {...}
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allprojects {...}
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/**
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+ Project-wide Gradle configuration properties
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*/
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ext {
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compileSdkVersion = 27
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targetSdkVersion = 27
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buildToolsVersion = "27.0.3"
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}
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```
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5. Include the library in your code:
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```javascript
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import { BlurView, VibrancyView } from "react-native-blur";
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```
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6. Compile and have fun!
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### BlurView
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**Properties:**
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- `blurType` (String)
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- `xlight` - extra light blur type
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- `light` - light blur type
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- `dark` - dark blur type
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- `extraDark` - extra dark blur type (tvOS only)
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- `regular` - regular blur type (iOS 10+ and tvOS only)
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- `prominent` - prominent blur type (iOS 10+ and tvOS only)
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- `blurAmount` (Default: 10, Number)
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- `0-100` - Adjusts blur intensity
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> Note: The maximum `blurAmount` on Android is 32, so higher values will be clamped to 32.
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> Complete usage example that works on iOS and Android:
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```javascript
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import React, { Component } from "react";
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import { View, Image, Text, findNodeHandle, StyleSheet } from "react-native";
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import { BlurView } from "react-native-blur";
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export default class Menu extends Component {
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constructor(props) {
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super(props);
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this.state = { viewRef: null };
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}
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imageLoaded() {
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this.setState({ viewRef: findNodeHandle(this.backgroundImage) });
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}
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render() {
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return (
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<View style={styles.container}>
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<Text>Hi, I am some unblurred text</Text>
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<BlurView
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style={styles.absolute}
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viewRef={this.state.viewRef}
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blurType="light"
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blurAmount={10}
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/>
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<Image
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ref={img => {
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this.backgroundImage = img;
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}}
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source={{ uri }}
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style={styles.absolute}
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onLoadEnd={this.imageLoaded.bind(this)}
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/>
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</View>
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);
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}
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}
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const styles = StyleSheet.create({
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container: {
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justifyContent: "center",
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alignItems: "center"
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},
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absolute: {
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position: "absolute",
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top: 0,
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left: 0,
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bottom: 0,
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right: 0
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}
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});
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```
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In this example, the `Image` component will be blurred, because the `BlurView` in positioned on top. But the `Text` will stay unblurred.
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Note that `viewRef` is only required if you need to support Android. See the [Android section](#android) for more details.
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### VibrancyView
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**Uses the same properties as `BlurView` (`blurType` and `blurAmount`).**
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> The vibrancy effect lets the content underneath a blurred view show through more vibrantly
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> (Note: `VibrancyView` is only supported on iOS. Also note that the `VibrancyView` must contain nested views.)
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```javascript
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import { VibrancyView } from "react-native-blur";
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export default class Menu extends Component {
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render() {
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return (
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<Image source={{ uri }} style={styles.absolute}>
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<VibrancyView blurType="light" style={styles.flex}>
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<Text>Hi, I am some vibrant text.</Text>
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</VibrancyView>
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</Image>
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);
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}
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}
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```
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### Android
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Android uses the [500px-android-blur](https://github.com/500px/500px-android-blur) library, which works by blurring a referenced view. This means that you must wait until the view you want to blur is rendered. You then use `findNodeHandle` to get a reference to that view, and pass that reference to the `BlurView` as the `viewRef` prop. Take a look at [the BlurView example](#blurview) to see how it works.
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The Android library introduces some limitations:
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- `BlurView` cannot be a child of the view that is being blurred (this would cause an infinite loop)
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- `BlurView` cannot contain any child components.
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If you only need to support iOS, then you can safely ignore these limitations.
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In addition to `blurType` and `blurAmount`, Android has some extra props that can be used to override the default behavior (or configure Android-specific behavior):
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- `blurRadius` (Number - between 0 and 25) - Manually adjust the blur radius. (Default: matches iOS blurAmount)
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- `downsampleFactor` (Number - between 0 and 25) - Scales down the image before blurring (Default: matches iOS blurAmount)
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- `overlayColor` (Color) - Set a custom overlay color (Default color based on iOS blurType)
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### Example React Native App
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This project includes an example React Native app, which was used to make the GIF in this README.
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You can run the apps by following these steps:
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1. Clone the repository
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```
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cd ~
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git clone https://github.com/react-native-community/react-native-blur.git
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```
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2. cd to `example`
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```
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cd react-native-blur/example
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```
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3. Install dependencies
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```
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npm install
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```
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4. Run the apps:
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#### Run the iOS app
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```
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react-native run-ios
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```
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#### Run the tvOS app
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type:
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```
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react-native run-ios
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```
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`react-native link` don’t works properly with the tvOS target so we need to add the library manually.
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First select your project in Xcode.
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<img src="./docs/tvOS-step-1.jpg" width="40%">
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After that, select the tvOS target of your application and select « General » tab
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<img src="./docs/tvOS-step-2.jpg" width="40%">
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Scroll to « Linked Frameworks and Libraries » and tap on the + button
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<img src="./docs/tvOS-step-3.jpg" width="40%">
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Select RNBlur-tvOS
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<img src="./docs/tvOS-step-4.jpg" width="40%">
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That’s all, you can use react-native-blur for your tvOS application
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#### Run the Android app
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```
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react-native run-android
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```
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### Troubleshooting
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On older instances of react-native, BlurView package does not get added into the MainActivity/MainApplication classes where you would see `Warning: Native component for 'BlurView' does not exist` in RN YellowBox or console.
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To rectify this, you can add the BlurViewPackage manually in MainActivity/MainApplication classes
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```java
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...
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import com.cmcewen.blurview.BlurViewPackage;
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...
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public class MainApplication extends Application implements ReactApplication {
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...
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@Override
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protected List<ReactPackage> getPackages() {
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return Arrays.<ReactPackage>asList(
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new MainReactPackage(),
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new BlurViewPackage()
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);
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}
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...
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}
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```
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### Questions?
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Feel free to contact me in [twitter](https://twitter.com/kureevalexey) or [create an issue](https://github.com/Kureev/react-native-blur/issues/new)
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