swift - metadata?.storageReference?.downloadURL() 返回 nil

Question

我正在尝试下载一个 url 以存储在我的数据库中，但 Firebase 中的新更新要求我使用新的方法来下载 url，从而禁止我这样做。这是我的代码:

 let imageName = NSUUID().uuidString
 let storageRef = storage.reference().child("project_images").child("\(imageName)")

    guard let uplodaData = UIImageJPEGRepresentation(image, 1) else {
        return
    }


    let uploadTask = storageRef.putData(uplodaData, metadata: nil, completion: { (metadata, error) in

        if error != nil{
            print(error ?? "Failed to upload data in the uploadImages object there was an error:", error!)
            return
        }

如果我在这里放置一个断点，它不会继续到下一节，我不知道为什么。当存储在错误的节点或其他东西时，我通常会看到这些问题。

metadata?.storageReference?.downloadURL(completion: { (url, error) in


        if error != nil {
            print("Failed to download url:", error!)
            return
        }

        let url = "\(String(describing: url))"
        uploadedImageUrlsArray.append(url)

        uploadCount += 1
        if uploadCount == imagesCount{
            completionHandler(uploadedImageUrlsArray)
        }
    })
})

当我只是一个断点时，我可以在完成时检查错误变量，它是零。

有人可以告诉我我在这里做错了什么吗。

Answer 1

您为此特定图像创建了一个存储引用，因此使用它代替 metadata?.storageReference。

storageRef.downloadURL(completion: { (url, error) in


    if error != nil {
        print("Failed to download url:", error!)
        return
    }

    let url = "\(String(describing: url))"
    uploadedImageUrlsArray.append(url)

    uploadCount += 1
    if uploadCount == imagesCount{
        completionHandler(uploadedImageUrlsArray)
    }
  })
})