元数据?.storageReference?.downloadURL()返回nil

时间:2018-05-24 17:54:39

标签: swift firebase metadata firebase-storage

我试图下载一个网址存储在我的数据库中,但Firebase中的新更新禁止我这样做,要求我使用新的方式下载网址。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
        }

如果我在此处设置断点,它不会继续经过下一节,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,我可以检查完成中的错误变量,它没有。

有人可以告诉我这里我做错了什么。

1 个答案:

答案 0 :(得分:1)

您为此特定图片创建了存储参考,因此请使用该参考而不是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)
    }
  })
})