react native 图片长按保存-优快云博客

本文介绍如何使用React Native在iOS和Android平台上保存图片到设备相册，涉及跨平台文件管理和图片处理技术。

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```

import React, {Component} from 'react';
import {
    Platform,
    CameraRoll,
    TouchableWithoutFeedback,
} from 'react-native';
import {NavigationPage} from  'teaset'
import RNFS from 'react-native-fs'
import Back from './Back'
export default class ContactUs extends NavigationPage {
    state = {
        pic: 'https://xxxxx.jpg' //图片的路径
    }
    leftBtn = () => {
        return <Back onPress={() => this.navigator.pop()}></Back>
    }
    saveConfirm = ()=>{
        Alert.alert('提示  ', '确定保存照片到相册？',
            [
                {text: " 取消", onPress: () => {
                    return
                }},
                {
                    text: "确定", onPress: () => {
                    if(Platform.OS === 'ios'){
                        this.saveImg()
                    }else{
                        this.saveImgInAndroid()
                    }

                }
                },
            ]
        )
    }
    //ios保存图片
    saveImg = async() => {
        let prefix = 'assets-library'
        var uri = await CameraRoll.saveToCameraRoll(this.state.pic, 'photo')
        if (uri && uri.indexOf(prefix) === 0) {
            Alert.alert('保存成功')
        } else {
            Alert.alert('保存失败')
        }

    }
     //安卓保存图片
    saveImgInAndroid = () => {
        const storeLocation = `${RNFS.ExternalDirectoryPath}`; //安卓ExternalDirectoryPath才是挂载的外置存储，可被用户随意查看
        let pathName = new Date().getTime() + "联系我们.png"
        let downloadDest = `${storeLocation}/${pathName}`;
        const ret = RNFS.downloadFile({fromUrl:this.state.pic,toFile:downloadDest});
        ret.promise.then(res => {
            if(res && res.statusCode === 200){
                var promise = CameraRoll.saveToCameraRoll("file://" + downloadDest);
                promise.then(function(result) {
                    Alert.alert("图片已保存至相册")
                }).catch(function(error) {
                    Alert.alert("保存失败")
                })
            }
        })
    }
    render() {
        return <View style={{backgroundColor:'#ffffff',flex:1, }}>
            <NavigationBar title={<View><Text style={{fontSize:16,color:'#ffffff'}}>联系我们</Text></View>}
                           left={this.leftBtn()}></NavigationBar>

            <View style={{flex:1}}>
                <View style={{flex: 1}}>
                    <View style={{display:'flex',alignItems:'center',marginTop:50}}>
                        <View><Text style={{color:'#333',fontSize:18}}>微信二维码</Text></View>
                        <TouchableWithoutFeedback onLongPress={()=>{this.saveConfirm()}}>
                        <Image source={{uri:this.state.pic}} 
                         style={{width:200,height:200,marginTop:20}}></Image>
                        </TouchableWithoutFeedback>
                    </View>
                    }
                </View>
            </View>
        </View>
    }
}

```

参考文档https://www.jianshu.com/p/6242ec32f75f

转载于:https://my.oschina.net/caiyue/blog/2254633