swift - storageRef.downloadURL 没有在里面执行代码

Question

func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)->())) {
    guard let uid = Auth.auth().currentUser?.uid else { return }
    let storageRef = Storage.storage().reference().child("user/\(uid)")

    let imageData = image.jpegData(compressionQuality: 0.75)

    let metaData = StorageMetadata()
    metaData.contentType = "image/jpg"

    storageRef.putData(imageData!, metadata: metaData)
    //Get url
    let imageRef = storageRef
    imageRef.downloadURL { url, error in
        if let error = error {
            print(error.localizedDescription)
        }else{
            print(url.absoluteString)
        }
    }

}

里面的代码不会执行，它会跳过所有内容，就像没有存储任何代码一样。我不确定完成是如何工作的，但我想它会打印错误或打印 url，但两者都不会。当我在这里设置断点时，它甚至不会检查 error = error。有没有我做错了什么或其他人有同样的问题？

imageRef.downloadURL { url, error in
    if let error = error {
        print(error.localizedDescription)
    }else{
        print(url.absoluteString)
    }
}

Answer 1

您的 putData:metadata:completion: 没有完成 block 。您可以在上传后 访问下载 URL，因此 putData 应如下所示。

storageRef.putData(imageData!, metadata: metaData) { (metadata, error) in
            guard let metadata = metadata else {
                // an error occurred!
                return
            }
            // Metadata contains file metadata such as size, content-type.
            let size = metadata.size

            // You can only access to download URL after upload.
            let imageRef = storageRef

            imageRef.downloadURL { (url, error) in
                guard let downloadURL = url else {
                    // an error occurred!
                    return
                }
            }
        }