如何将打印项目添加到 Firebase 数据库？

Question

我正在尝试获取打印的项目并将其与其他网点一起插入到我的 Firebase 数据库中。谢谢！

@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
                } else {
                    print((metadata?.downloadURL()?.absoluteString)!)
                   //i want to take the line above and insert it into the 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 ])

        //insert the download URL above 
        self.performSegue(withIdentifier: "kost", sender: self)    
    }
}

Answer 1

我明白你现在的问题了。您正在以完全错误的方式将图像上传到 firebase。在事件didFinishPickingMediaWithInfo 中，您不应该对firebase 做任何事情。您应该只将您的 UIImageViews 图像设置为存储从图像选择器提供的数据的值。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    self.dismiss(animated: true, completion: nil)
    if let editedImage = info[UIImagePickerControllerEditedImage] as? UIImage{
        myImageView.image = editedImage
    }else{
        print("Something went wrong")
    }
}

然后在您的 IBAction 中，您应该将所有内容上传到 firebase。这是一个简单的函数，可以将你的图片上传到数据库中：

func uploadImage(){
    if let fileData = UIImageJPEGRepresentation(myImageView.image!, 0.8){
    let storageRef = storage.reference().child("images").child("testImage.jpg")
        storageRef.put(fileData, metadata: nil, completion: { (metadata, error) in
            if error != nil{
                print(error?.localizedDescription ?? "error")
                return
            }
            let downloadURL = metadata?.downloadURL()?.absoluteString
            // Write the download URL to your Database
            self.ref?.child("images").setValue(downloadURL)
        })
    }else{
        print("error")
    }
}