swift - 将数据写入 Firebase 不起作用 - 无法将类型 'user' 的值转换为预期参数类型 'AnyObject?'

Question

我尝试将注册数据保存到 Firebase，但收到“无法将‘user’类型的值转换为预期参数类型‘AnyObject？’”错误。我尝试了很多东西，但我似乎无法弄清楚......有人可以帮助我吗？怎么保存呢？

import UIKit
import Firebase
import FirebaseDatabaseUI

class EventViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    //outlets for text & image
    @IBOutlet weak var photoImageView: UIImageView!

    @IBOutlet weak var eventName: UITextField!
    @IBOutlet weak var eventDate: UITextField!
    @IBOutlet weak var eventDes: UITextView!



    //Database connection
    let rootref = FIRDatabase().reference()
    var imagePicker: UIImagePickerController = UIImagePickerController()



    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func submitEvent(sender: AnyObject) {

        let name = eventName.text
        let date = eventDate.text
        let text = eventDes.text
        var data: NSData = NSData()

        if let image = photoImageView.image {
            data = UIImageJPEGRepresentation(image,0.1)!
        }

         let base64String = data.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)

        if let unwrappedName = name , unwrappedDate = date, unwrappedText = text{
            let user: NSDictionary = ["name":unwrappedName, "date":unwrappedDate, "text":unwrappedText, "photoBase64":base64String]
        }

        //Add firebase child node
        let event = FIRDatabase().reference().child(name!)

        // Write data to Firebase

        event.setValue(user.init())

        navigationController?.popViewControllerAnimated(true)
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        view.endEditing(true)
        super.touchesBegan(touches, withEvent: event)
    }

        //UIImagePickerControllerDelegate methods

        func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
            imagePicker.dismissViewControllerAnimated(true, completion: nil)
            photoImageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
        }

        func imagePickerControllerDidCancel(picker: UIImagePickerController) {
            dismissViewControllerAnimated(true, completion: nil)
        }

    @IBAction func addPicture(sender: AnyObject) {
        if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)) {
            imagePicker =  UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = .Camera

            presentViewController(imagePicker, animated: true, completion: nil)
        } else {
            imagePicker.allowsEditing = false
            imagePicker.sourceType = .PhotoLibrary
            imagePicker.delegate = self
            presentViewController(imagePicker, animated: true, completion:nil)
        }
    }
}

Answer 1

您已经为基础数据库 rootRef 创建了一个实例，并且您又创建了一个不需要的引用。而且您还创建了您的用户: NSDictionary 在 if let 中，因此您无法在范围之外访问该变量。在上面声明您的用户，然后使用它。试试这个代码:

    let name = eventName.text
    let date = eventDate.text
    let text = eventDes.text
    var data: NSData = NSData()
    var user = NSDictionary()//declare here
    if let image = photoImageView.image {
        data = UIImageJPEGRepresentation(image,0.1)!
    }

    let base64String = data.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)

    if let unwrappedName = name , unwrappedDate = date, unwrappedText = text{
        //use your declared dictionary
        user = ["name":unwrappedName, "date":unwrappedDate, "text":unwrappedText, "photoBase64":base64String]
    }

    //Add firebase child node
    //let event = FIRDatabase().reference().child(name!)
    //Do not create one more reference to database

    rootref.child(name!).setValue(user)
    //rootref.setValue(user)

    // Write data to Firebase
    //event.setValue(user.init())

    navigationController?.popViewControllerAnimated(true)