swift - 尝试获取存储引用的下载 URL 以填充标签

Question

这个问题已经有答案了:

Firebase Storage Warning: downloadURL()' is deprecated: Use `StorageReference.downloadURLWithCompletion() (2 个回答)

Firebase Storage downloadURL()' is deprecated: Use `StorageReference.downloadURLWithCompletion() (2 个回答)

已关闭 4 年前。

我正在使用 Xcode 10 和此方法将应用程序中选择的照片上传到 Firebase Storage。它正在成功上传照片，但是，我正在尝试获取下载 URL 并将其填充到同一屏幕上的标签中。

我尝试过metadata.downloadURL，但这会引发错误元数据不再识别 Xcode 10 中的 downloadURL。

这是我的职责...

   func uploadPhoto(completion: @escaping (_ url: String?) -> Void) {

    let photoName = NSUUID().uuidString
    let storageRef = Storage.storage().reference().child("photoURL").child("\(photoName).jpg")

    let photo = self.photoImageView.image!

    if let uploadData = photo.jpegData(compressionQuality: 0.75) {
        storageRef.putData(uploadData, metadata: nil) { (metadata, error) in

            guard metadata != nil else {
                // Uh-oh, an error occurred!
                return
            }
            // Metadata contains file metadata such as size, content-type.
            //let size = metadata?.size

            // You can also access to download URL after upload.
            storageRef.downloadURL { (url, error) in
                guard url != nil else {
                    // Uh-oh, an error occurred!
                    return
                }

                // Metadata contains file metadata such as size, content-type, and download URL.

                // THROWS ERROR
                // let downloadURL = metadata.downloadURL

                // MY ATTEMPT
                var downloadURL = StorageReference.downloadURL(self.refStorage)
               completion(downloadURL = self.urlLabel.text) 
            }
        }
    }
}

Answer 1

你需要

storageRef.put(uploadData, metadata: nil, completion: { (metadata, error) in
    if(error != nil){
        print(error)
        return
    }

    storageRef.downloadURL { url, error in
        if let error = error {
            // Handle any errors
            if(error != nil){
                print(error) 
            }
        } else {
            // Get the download URL for 'images/stars.jpg'

            let urlStr:String = (url?.absoluteString) ?? ""
            print(urlStr)
        }
    }
})