Save and Fetch Private DB in CloudKit

CloudKitWorking.swift

// Don't forget to set capabilities to iCloud on, Cloudkit

import UIKit
import CloudKit

class ViewController: UIViewController {
    
    let database = CKContainer.defaultContainer().privateCloudDatabase
    
    enum CarType: String{
        case Estate = "Estate"
        
    }
    
    
    func recordId() -> CKRecordID{
        
        var recordName  = "hi"
        
        return CKRecordID(recordName: recordName)
        
    }
    
    func saveRecordWithCompletionHandler(completionHandler:
        (succeeded: Bool, error: NSError!) -> Void){
            
            let volvoV50 = CKRecord(recordType: "MyCar", recordID: recordId())
            volvoV50.setObject(2015, forKey: "year")
            
            database.saveRecord(volvoV50, completionHandler: {
                (record: CKRecord?, error: NSError?) in
                completionHandler(succeeded: (error == nil), error: error)
            })
            
    }
    
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        
        print("Fetching the record to see if it exists already...")
        
        database.fetchRecordWithID(recordId(), completionHandler:{
            (record: CKRecord?, error: NSError?) in
            
            if error != nil{
                print("An error occurred")
                
                if error!.code == CKErrorCode.UnknownItem.rawValue{
                    print("This error means that the record was not found.")
                    print("Saving the record...")
                    
                    self.saveRecordWithCompletionHandler{
                        (succeeded: Bool, error: NSError!) in
                        
                        if succeeded{
                            print("Successfully saved the record")
                        } else {
                            print("Failed to save the record. Error = \(error)")
                        }
                        
                    }
                    
                } else {
                    print("I don't understand this error. Error = \(error)")
                }
                
            } else {
                print("Seems like we had previously stored the record. Great!")
                print("Retrieved record = \(record)")
                
                guard let record = record else {
                    print("The record is nil")
                    return
                }
                
                /* Now make your changes to the record */
                record.setValue(2016, forKey:"year")
                self.database.saveRecord(record, completionHandler:
                    {(record:CKRecord?, error: NSError?) in
                        
                        if error == nil{
                            print("Successfully modified the record")
                        } else {
                            print("Failed to modify the record. Error = \(error)")
                        }
                        
                })
                
            }
            
        })
        
    }
    
    
}