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React-Native: 如何添加全屏 Lottie 动画

react-nativelottie
7
我正在使用来自Lottie的线性渐变，该代码在iOS上运行良好，但在Android中无法适应全屏，渐变和视图之间存在某种内边距。 在iOS上它可以正常工作...我尝试了很多方法， 包括将padding设置为0，甚至将margin设置为-20，但都没有起作用...有什么解决办法吗？ enter image description here 
import React, { Component } from 'react';
import {
  Text,
  StyleSheet,
  View,
  Platform,
  Dimensions
} from 'react-native';
import SignInScreen from './src/screens/auth/SignInScreen';
import Animation from 'lottie-react-native';

 import anim from './assets/gradient_animated_background.json';
const height = Dimensions.get('window').height + 20;
const width = Dimensions.get('window').width + 20;

export default class App extends Component {
  componentDidMount() {
    this.animation.play();
  }

  render() {
    return (
      <View style={styles.container}>
          <Animation
            ref={animation => {
              this.animation = animation;
            }}
            style={{
              backgroundColor: 'red',
              height: '100%',
              width: '100%'
            }}
            loop={true}
            source={Platform.OS === 'ios' ? anim : 'gradient_animated_background.json'}
          />
       </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    backgroundColor: 'blue',
    flex: 1,
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
    color: '#ffffff'
  }
});

动画，每当我改变宽度和高度时，它会强制保持纵横比...(虽然不确定)
{"v":"4.6.10","fr":15,"ip":0,"op":155,"w":1080,"h":1920,"nm":"background","ddd":0,"assets":[],"layers":[{"ddd":0,"ind":1,"ty":4,"nm":"Shape Layer 1","ks":{"o":{"a":0,"k":100},"r":{"a":0,"k":0},"p":{"a":0,"k":[540,960,0]},"a":{"a":0,"k":[0,0,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","it":[{"ty":"rc","d":1,"s":{"a":0,"k":[1160,880]},"p":{"a":0,"k":[0,0]},"r":{"a":0,"k":0},"nm":"Rectangle Path 1","mn":"ADBE Vector Shape - Rect"},{"ty":"st","c":{"a":0,"k":[0.9960784,0.7843137,0.145098,1]},"o":{"a":0,"k":100},"w":{"a":0,"k":6},"lc":1,"lj":1,"ml":4,"nm":"Stroke 1","mn":"ADBE Vector Graphic - Stroke"},{"ty":"gf","o":{"a":0,"k":100},"r":1,"g":{"p":3,"k":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[0,0.511,0.89,0.283,0.5,0.334,0.873,0.583,1,0.156,0.857,0.882],"e":[0,0.726,0.283,0.89,0.5,0.441,0.356,0.886,1,0.156,0.429,0.882]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[0,0.726,0.283,0.89,0.5,0.441,0.356,0.886,1,0.156,0.429,0.882],"e":[0,0.89,0.283,0.283,0.5,0.886,0.553,0.219,1,0.882,0.823,0.156]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[0,0.89,0.283,0.283,0.5,0.886,0.553,0.219,1,0.882,0.823,0.156],"e":[0,0,0.312,0.737,0.5,0.078,0.597,0.754,1,0.156,0.882,0.771]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[0,0,0.312,0.737,0.5,0.078,0.597,0.754,1,0.156,0.882,0.771],"e":[0,0.51,0.89,0.282,0.5,0.333,0.873,0.582,1,0.157,0.855,0.882]},{"t":120}]}},"s":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[-430.769,-404.573],"e":[23.726,-364.48],"to":[75.7491683959961,6.68213844299316],"ti":[-123.915840148926,-8.51547145843506]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[23.726,-364.48],"e":[312.726,-353.48],"to":[123.915840148926,8.51547145843506],"ti":[-1.00208830833435,-1.83333337306976]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[312.726,-353.48],"e":[29.739,-353.48],"to":[1.00208830833435,1.83333337306976],"ti":[120.055290222168,0.60746711492538]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[29.739,-353.48],"e":[-407.606,-357.125],"to":[-120.055290222168,-0.60746711492538],"ti":[72.8907089233398,0.60746711492538]},{"t":120}]},"e":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[374.412,342.611],"e":[22.822,357.191],"to":[-58.5984153747559,2.42986845970154],"ti":[132.520950317383,-7.89707231521606]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[22.822,357.191],"e":[-420.714,389.994],"to":[-132.520950317383,7.89707231521606],"ti":[-4.68509674072266,-7.89707231521606]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[-420.714,389.994],"e":[50.932,404.573],"to":[4.68509674072266,7.89707231521606],"ti":[-132.918350219727,4.25226974487305]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[50.932,404.573],"e":[376.797,364.48],"to":[132.918350219727,-4.25226974487305],"ti":[-54.3107261657715,6.68213844299316]},{"t":120}]},"t":1,"nm":"Gradient Fill 1","mn":"ADBE Vector Graphic - G-Fill"},{"ty":"tr","p":{"a":0,"k":[0,0],"ix":2},"a":{"a":0,"k":[0,0],"ix":1},"s":{"a":0,"k":[93.29,219.491],"ix":3},"r":{"a":0,"k":0,"ix":6},"o":{"a":0,"k":100,"ix":7},"sk":{"a":0,"k":0,"ix":4},"sa":{"a":0,"k":0,"ix":5},"nm":"Transform"}],"nm":"Rectangle 1","np":3,"cix":2,"ix":1,"mn":"ADBE Vector Group"}],"ip":0,"op":155,"st":0,"bm":0,"sr":1},{"ddd":0,"ind":2,"ty":1,"nm":"Deep Red Solid 1","ks":{"o":{"a":0,"k":100},"r":{"a":0,"k":0},"p":{"a":0,"k":[540,960,0]},"a":{"a":0,"k":[540,960,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"sw":1080,"sh":1920,"sc":"#be2a2a","ip":0,"op":155,"st":0,"bm":0,"sr":1}]}
你介意也发布一下动画吗？ - ovidb
@ovidb 更新了我的问题。 - Sarmad Shah
2个回答
8
你缺少的是“resizeMode”，这在文档页面上没有指定，但如果你查看源代码，你会找到它。
如果你不介意失去一些像素，下面的内容可以解决问题：
import React, { Component } from 'react';

import {
  StyleSheet,
  View,
  Dimensions
} from 'react-native';
import LottieView from 'lottie-react-native';
import { anim } from './assets/animation.json';

const { height, width } = Dimensions.get('window')

export default class App extends Component {
  componentDidMount() {
    this.animation.play();
  }

  render() {
    return (
      <View style={styles.container}>
          <LottieView
            ref={animation => {
              this.animation = animation;
            }}
            style={{
              width: width + 10,
              height: height,
              marginLeft: - 5
            }}
            resizeMode='cover'
            loop={true}
            source={anim}
          />
       </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    backgroundColor: 'blue',
    flex: 1,
  },
});

请注意，由于我在https://snack.expo.io上尝试过这种方法，但出于某种原因他们不喜欢JSON文件，因此我以略有不同的方式导出了资产，所以现在资产看起来是这样的：/assets/animation.json.js。
export const anim = {"v":"4.6.10","fr":15,"ip":0,"op":155,"w":1080,"h":1920,"nm":"background","ddd":0,"assets":[],"layers":[{"ddd":0,"ind":1,"ty":4,"nm":"Shape Layer 1","ks":{"o":{"a":0,"k":100},"r":{"a":0,"k":0},"p":{"a":0,"k":[540,960,0]},"a":{"a":0,"k":[0,0,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"shapes":[{"ty":"gr","it":[{"ty":"rc","d":1,"s":{"a":0,"k":[1160,880]},"p":{"a":0,"k":[0,0]},"r":{"a":0,"k":0},"nm":"Rectangle Path 1","mn":"ADBE Vector Shape - Rect"},{"ty":"st","c":{"a":0,"k":[0.9960784,0.7843137,0.145098,1]},"o":{"a":0,"k":100},"w":{"a":0,"k":6},"lc":1,"lj":1,"ml":4,"nm":"Stroke 1","mn":"ADBE Vector Graphic - Stroke"},{"ty":"gf","o":{"a":0,"k":100},"r":1,"g":{"p":3,"k":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[0,0.511,0.89,0.283,0.5,0.334,0.873,0.583,1,0.156,0.857,0.882],"e":[0,0.726,0.283,0.89,0.5,0.441,0.356,0.886,1,0.156,0.429,0.882]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[0,0.726,0.283,0.89,0.5,0.441,0.356,0.886,1,0.156,0.429,0.882],"e":[0,0.89,0.283,0.283,0.5,0.886,0.553,0.219,1,0.882,0.823,0.156]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[0,0.89,0.283,0.283,0.5,0.886,0.553,0.219,1,0.882,0.823,0.156],"e":[0,0,0.312,0.737,0.5,0.078,0.597,0.754,1,0.156,0.882,0.771]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[0,0,0.312,0.737,0.5,0.078,0.597,0.754,1,0.156,0.882,0.771],"e":[0,0.51,0.89,0.282,0.5,0.333,0.873,0.582,1,0.157,0.855,0.882]},{"t":120}]}},"s":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[-430.769,-404.573],"e":[23.726,-364.48],"to":[75.7491683959961,6.68213844299316],"ti":[-123.915840148926,-8.51547145843506]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[23.726,-364.48],"e":[312.726,-353.48],"to":[123.915840148926,8.51547145843506],"ti":[-1.00208830833435,-1.83333337306976]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[312.726,-353.48],"e":[29.739,-353.48],"to":[1.00208830833435,1.83333337306976],"ti":[120.055290222168,0.60746711492538]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[29.739,-353.48],"e":[-407.606,-357.125],"to":[-120.055290222168,-0.60746711492538],"ti":[72.8907089233398,0.60746711492538]},{"t":120}]},"e":{"a":1,"k":[{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":0,"s":[374.412,342.611],"e":[22.822,357.191],"to":[-58.5984153747559,2.42986845970154],"ti":[132.520950317383,-7.89707231521606]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":31,"s":[22.822,357.191],"e":[-420.714,389.994],"to":[-132.520950317383,7.89707231521606],"ti":[-4.68509674072266,-7.89707231521606]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":61,"s":[-420.714,389.994],"e":[50.932,404.573],"to":[4.68509674072266,7.89707231521606],"ti":[-132.918350219727,4.25226974487305]},{"i":{"x":0.833,"y":0.833},"o":{"x":0.167,"y":0.167},"n":"0p833_0p833_0p167_0p167","t":91,"s":[50.932,404.573],"e":[376.797,364.48],"to":[132.918350219727,-4.25226974487305],"ti":[-54.3107261657715,6.68213844299316]},{"t":120}]},"t":1,"nm":"Gradient Fill 1","mn":"ADBE Vector Graphic - G-Fill"},{"ty":"tr","p":{"a":0,"k":[0,0],"ix":2},"a":{"a":0,"k":[0,0],"ix":1},"s":{"a":0,"k":[93.29,219.491],"ix":3},"r":{"a":0,"k":0,"ix":6},"o":{"a":0,"k":100,"ix":7},"sk":{"a":0,"k":0,"ix":4},"sa":{"a":0,"k":0,"ix":5},"nm":"Transform"}],"nm":"Rectangle 1","np":3,"cix":2,"ix":1,"mn":"ADBE Vector Group"}],"ip":0,"op":155,"st":0,"bm":0,"sr":1},{"ddd":0,"ind":2,"ty":1,"nm":"Deep Red Solid 1","ks":{"o":{"a":0,"k":100},"r":{"a":0,"k":0},"p":{"a":0,"k":[540,960,0]},"a":{"a":0,"k":[540,960,0]},"s":{"a":0,"k":[100,100,100]}},"ao":0,"sw":1080,"sh":1920,"sc":"#be2a2a","ip":0,"op":155,"st":0,"bm":0,"sr":1}]}
我在复制你的代码时遇到了蓝屏问题...也许这是因为使用Expo和CLI时有些不同的行为...在你的情况下，你正在使用Expo。 - Sarmad Shah
你创建了/assets/animation.json.js文件，并将代码粘贴到我答案末尾提供的那份吗？同时也在安卓设备上测试了一下，我遇到了你提到的问题。 - ovidb
这里有一个工作示例，也许你想稍微调整一下边距，我注意到了一些奇怪的边框。https://snack.expo.io/@ovidb/lottie-fullscreen - ovidb
ResizeMode 对我来说是有效的，但这在文档页面上没有明确说明。 - EduardoUstarez
4

因此，第一个答案提出了一个重要的问题（添加resizeMode="cover"）。

但这还不够，如果在多个屏幕尺寸上测试，您可能仍然会发现不需要的边距和空格。我也遇到过这个问题，

这里是简单的解决方案：

  1. 获取lottie文件的尺寸（例如300 x 600）
  2. 仅设置width，然后使用aspectRatio来确定高度。（必须）
  3. 设置flexGrow=1 （必须）

例如 

<LottieView 
  style={{
      width: 300, 
      aspectRatio: 300 / 600,
      flexGrow: 1, 
      alignSelf: 'center',
    }} 
  resizeMode="cover" 
  ref={animation=> { this.animation = animation; }} 
  source={require ('./assets/animation.json')} 
  autoPlay={false} 
  loop={false} 
 />

我猜问题出现的原因是在Lottie视图的样式中无法同时使用width和height。因此，一个简单的解决方法是使用width和aspectRatio。祝好运！
这应该是被接受的答案！ - theneekz
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