React Native 从 url 下载图像并保存在图库中

Question

我想从 URL 下载图片并保存在图库中。

此来源适用于 Android，但不适用于 iOS。

import RNFetchBlob from "rn-fetch-blob";


let imgUrl = 'https://static.scientificamerican.com/sciam/cache/file/EAF12335-B807-4021-9AC95BBA8BEE7C8D_source.jpg'

let newImgUri = imgUrl.lastIndexOf('/');
let imageName = imgUrl.substring(newImgUri);

let dirs = RNFetchBlob.fs.dirs;
let path = Platform.OS === 'ios' ? dirs['MainBundleDir'] + imageName : dirs.PictureDir + imageName;

 RNFetchBlob.config({
     fileCache: true,
     appendExt: 'png',
     indicator: true,
     IOSBackgroundTask: true,
     path: path,
     addAndroidDownloads: {
         useDownloadManager: true,
         notification: true,
         path: path,
         description: 'Image'
      },

     }).fetch("GET", imgUrl).then(res => { 
            console.log(res, 'end downloaded') 
   });

我需要 iOS 的权限才能将照片保存在图库中？

Answer 1

对于iOS，您无需使用 fetch-blob 并下载它。您需要使用来自 react-native 的 CameraRoll 并调用 saveToCameraRoll()

https://facebook.github.io/react-native/docs/cameraroll

import RNFetchBlob from "rn-fetch-blob";
import { CameraRoll, Platform } from "react-native";

let imgUrl = 'https://static.scientificamerican.com/sciam/cache/file/EAF12335-B807-4021-9AC95BBA8BEE7C8D_source.jpg'

let newImgUri = imgUrl.lastIndexOf('/');
let imageName = imgUrl.substring(newImgUri);

let dirs = RNFetchBlob.fs.dirs;
let path = Platform.OS === 'ios' ? dirs['MainBundleDir'] + imageName : dirs.PictureDir + imageName;

saveToGallery = () => {
  if (Platform.OS == 'android') {

    RNFetchBlob.config({
      fileCache: true,
      appendExt: 'png',
      indicator: true,
      IOSBackgroundTask: true,
      path: path,
      addAndroidDownloads: {
        useDownloadManager: true,
        notification: true,
        path: path,
        description: 'Image'
      },

    }).fetch("GET", imgUrl).then(res => {
      console.log(res, 'end downloaded')
    });
  } else {
    CameraRoll.saveToCameraRoll(imgUrl);
  }
}

Answer 2

你必须使用相机胶卷。

npm install @react-native-community/cameraroll --save
react-native link @react-native-community/cameraroll
来自：

从 "react-native" 导入 { CameraRoll}；

至

从“@react-native-community/cameraroll”导入相机胶卷；

React Native 从 url 下载图像并保存在图库中

React Native Download image from url and save in Gallery

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photo-gallery

imagedownload