将图像上传到Firebase存储和数据库

  • Z时代
  • 2024-01-10
  • 分类：问答

我想将图像的下载URL放入Firebase数据库中。我可以将图像上传到存储中，但无法弄清楚如何将URL与其余的“帖子”一起放入数据库。

@IBOutlet weak var titleText: UITextField!
@IBOutlet weak var authorText: UITextField!
@IBOutlet weak var mainText: UITextView!
@IBOutlet weak var dateText: UITextField!
@IBOutlet weak var myImageView: UIImageView!
var ref:FIRDatabaseReference?
override func viewDidLoad() {
    super.viewDidLoad()
    ref = FIRDatabase.database().reference()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}
@IBAction func uploadImage(_ sender: Any) {
       let image = UIImagePickerController()
    image.delegate = self
    image.sourceType = UIImagePickerControllerSourceType.photoLibrary
    image.allowsEditing = false
    self.present(image, animated: true)
    {
        //after its completed
    }
}
@objc(imagePickerController:didFinishPickingMediaWithInfo:) func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
    {
        myImageView.image = image
    }
    else
    {
        //error
    }
    self.dismiss(animated: true, completion: nil)
    let storageRef = FIRStorage.storage().reference().child("myImage.png")
    if let uploadData = UIImagePNGRepresentation(self.myImageView.image!){
        storageRef.put(uploadData, metadata: nil, completion:
            {
                (metadata, error) in
                if error != nil {
                    print("error")
                    return
                }
   print(metadata)
   //how do I put the download URL in the metadata into my database
        }  
        )
    }
}
@IBAction func addPost(_ sender: Any) {
    if self.titleText.text != "" && self.authorText.text != "" && self.mainText.text != "" && self.dateText.text != ""
    {
        ref?.child("Posts").childByAutoId().setValue(["Title": titleText.text,"Article": mainText.text, "Author": authorText.text, "Date": dateText.text, "myImageURL": myImageURL])
        //the myImageURL part is where I get an error
        self.performSegue(withIdentifier: "post", sender: self)
    }
    else{
        let alertController = UIAlertController(title: "Oops!", message: "Field left blank", preferredStyle: .alert)
        let defaultAction = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
        alertController.addAction(defaultAction)
        self.present(alertController, animated: true, completion: nil)
        }
    }
}

回答：

像这样组织您upload和savefunc：

func uploadMedia(completion: @escaping (_ url: String?) -> Void) { 
    let storageRef = FIRStorage.storage().reference().child("myImage.png")
    if let uploadData = UIImagePNGRepresentation(self.myImageView.image!) {
        storageRef.put(uploadData, metadata: nil) { (metadata, error) in
            if error != nil {
                print("error")
                completion(nil)
            } else {
                completion((metadata?.downloadURL()?.absoluteString)!)) 
                // your uploaded photo url.
            }
       }
 }

接下来，只需连接FIRDatabase并保存到您的节点即可。

 @IBAction func addPost(_ sender: Any) {
     if self.titleText.text   != "" && self.authorText.text != "" 
        && self.mainText.text != "" && self.dateText.text   != "" {
     uploadMedia() { url in 
          guard let url = url else { return }
          ref?.child("Posts").childByAutoId().setValue([
                                "Title"      : titleText.text,
                                "Article"    : mainText.text, 
                                "Author"     : authorText.text, 
                                "Date"       : dateText.text, 
                                "myImageURL" : url
                                ])
     }
 }

您也可以查看我有关上传数据并将URL保存到数据库的答案

希望能帮助到你

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