通过从firebase存储中提取图像作出本机反应

uploadPhotoAsync=async uri=>{
const path=`photos/${this.uid}/${Date.now（）}.jpg`；
//uploadPhotoAsync=（uri，文件名）=>{
返回新承诺（异步（res，rej）=>{
常量响应=等待获取（uri）；
const file=wait response.blob（）；
让上传=firebase
.储存
.ref（路径）//路径
.put（文件）；
上传(
“状态已更改”，
快照=>{}，
错误=>{
rej（err）；
},
异步（）=>{
const url=wait upload.snapshot.ref.getDownloadURL（）；
res（url）；
}
);
});
}；

您需要存储url，请参阅代码中的注释。 然后，当您需要显示/拉取此图像时，从firebase db获取url

        uploadPhotoAsync = async uri => {
        const path = `photos/${this.uid}/${Date.now()}.jpg`;
        // uploadPhotoAsync = (uri, filename) => {

            return new Promise(async (res, rej) => {
                const response = await fetch(uri);
                const file = await response.blob();

                let upload = firebase
                    .storage()
                    .ref(path) //path
                    .put(file);

                    upload.on(
                        "state_changed",
                        snapshot => {},
                        err => {
                            rej(err);
                        },
                        async () => {
                            const url = await upload.snapshot.ref.getDownloadURL();
                            //store this url in firebase db related to the user 
                            //e.g. `${userid}\photo\url` 
                            res(url);
                        }
                    );
                });
            };