"ionic Angular 9 等到文件下载 url 可用"

Question

我正在使用 ionic 5 和 angular 9 将数据 url 上传到 firebase 存储。 我的代码运行良好，但我不确定如何等到下载 url 可用。

下面是代码

uploadToFireStore(imageData){
    const storage = getStorage();
    const storageRef = ref(storage, (new Date().getTime().toString()));
    uploadString(storageRef, imageData, 'data_url').then((snapshot) => {
      getDownloadURL(snapshot.ref).then((downloadURL) => {
        console.log('File available at', downloadURL);
        this.downloadURL = downloadURL
      });
    });
  }

Answer 1

您可能只需要返回您的承诺链：

uploadToFireStore(imageData){
    const storage = getStorage();
    const storageRef = ref(storage, (new Date().getTime().toString()));
    return uploadString(storageRef, imageData, 'data_url').then((snapshot) => {
      return getDownloadURL(snapshot.ref).then((downloadURL) => {
        console.log('File available at', downloadURL);
        this.downloadURL = downloadURL
      });
    });
  }