Swift 3使用CKAsset将图像发送到CloudKit

N.B：这不是一个重复的问题，我已经看过其他解决方案，但没有一个在Swift 3中工作，但他们在Swift 2中工作 .

我需要从带有UIImagePickerController的照片库中获取图像，工作正常，然后我需要做的是，以某种方式将其保存到CloudKit中的公共记录，我对如何完成这一点非常开放 . 如果可能的话，请明确我需要更改/添加什么以及在哪里 .

我提供了我的整个视图控制器文件以确保 .

导入UIKit导入CloudKit

var email：String =“”

class ViewController：UIViewController，UITextFieldDelegate，UIImagePickerControllerDelegate，UINavigationControllerDelegate {

//MARK: Properties

@IBOutlet weak var firstNameField: UITextField!
@IBOutlet weak var lastNameField: UITextField!
@IBOutlet weak var emailField: UITextField!
@IBOutlet weak var passwordField: UITextField!
@IBOutlet weak var confirmPasswordField: UITextField!
@IBOutlet weak var notMatching: UILabel!
@IBOutlet weak var emailLabel: UILabel!
@IBOutlet weak var errorLabel: UILabel!

@IBOutlet weak var photoImageView: UIImageView!



override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.firstNameField.autocorrectionType = .no
    self.lastNameField.autocorrectionType = .no
    self.emailField.autocorrectionType = .no
    self.passwordField.autocorrectionType = .no
    self.confirmPasswordField.autocorrectionType = .no
    self.notMatching.isHidden = true

    firstNameField.delegate = self
    lastNameField.delegate = self
    emailField.delegate = self
    passwordField.delegate = self
    confirmPasswordField.delegate = self


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

//MARK: UIImagePickerControllerDelegate

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {

    // Dismiss the picker if the user canceled.
    dismiss(animated: true, completion: nil)

}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    // The info dictionary may contain multiple representations of the image. You want to use the original.
    guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
        fatalError("Expected a dictionary containing an image, but was provided the following: \(info)")
    }

    // Set photoImageView to display the selected image.
    photoImageView.image = selectedImage



    // Dismiss the picker.
    dismiss(animated: true, completion: nil)


}


//MARK: Actions

@IBAction func selectImageFromPhotoLibrary(_ sender: UITapGestureRecognizer) {

    //Hide keyboards
    firstNameField.resignFirstResponder()
    lastNameField.resignFirstResponder()
    emailField.resignFirstResponder()
    passwordField.resignFirstResponder()
    confirmPasswordField.resignFirstResponder()

    let imagePickerController = UIImagePickerController()

    imagePickerController.sourceType = .photoLibrary


    imagePickerController.delegate = self
    present(imagePickerController, animated: true, completion: nil)

}



@IBAction func signUpPressed(_ sender: UIButton) {

    let container = CKContainer.default()
    let pubDB = container.publicCloudDatabase
    //let privDB = container.privateCloudDatabase

    //Check if users exist
    let query = CKQuery(recordType: "MyUsers", predicate: NSPredicate(format: "TRUEPREDICATE", argumentArray: nil))
    pubDB.perform(query, inZoneWith: nil, completionHandler: { (records, error) in

        //error code 11 is no objects found
        if error == nil || error?._code == 11 {

            var emailExists = false

            for record in records! {

                if record.object(forKey: "email") as? String == self.emailField.text {
                    //other user with the same username exists - don't allow user to create account
                    emailExists = true

                }

            }

            if emailExists == true {


                self.emailLabel.text = "\(self.emailField.text!) is taken. Please choose another one."

            } else {

                if self.firstNameField.text != nil && self.lastNameField.text != nil && self.passwordField.text == self.confirmPasswordField.text {

                    //user can sign up


                    let record = CKRecord(recordType: "MyUsers")
                    record.setObject(self.emailField.text! as CKRecordValue?, forKey: "email")
                    record.setObject(self.passwordField.text! as CKRecordValue?, forKey: "password")
                    record.setObject(self.firstNameField.text! as CKRecordValue?, forKey: "firstName")
                    record.setObject(self.lastNameField.text! as CKRecordValue?, forKey: "lastName")



                    print("all good")

                    pubDB.save(record, completionHandler: { (record, error) in

                        if error == nil {

                            OperationQueue.main.addOperation {

                                UserDefaults.standard.set(self.emailField.text!, forKey: "Email")
                                email = self.emailField.text!
                                //self.performSegue(withIdentifier: "Games", sender: self)

                            }

                        } else {

                            print(error)

                        }

                    })


                } else {



                }


            }



        } else {

            print(error)

        }

    })

}



// MARK: UITextFieldDelegate

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    // Hide the keyboard.
    textField.resignFirstResponder()
    return true
}

}

谢谢！