安装插件

npm install react-native-image-picker
// 引入
import { launchCamera, launchImageLibrary} from 'react-native-image-picker';

 代码如下

<Button title="点击启动相机" onPress={() => takePhoto()}></Button>
<Button title="点击启动相册" onPress={() => addPhoto()}></Button>// 相册选择图片
const addPhoto = () => {launchImageLibrary({mediaType: 'photo', //'photo'照片， 'video'视频， 'mixed'混合selectionLimit: 1, // 1为一张，0不限制数量},res => {if (res.assets) {console.log(res.assets)}},);
};
// 相机拍照
const takePhoto = () => {launchCamera({mediaType: 'photo', // 'photo'照片， 'video'视频， 'mixed'混合cameraType: 'back', //'back'后置摄像头， 'front'前置相机},res => {if (res.assets) {console.log(res.assets)}},);
};