swift - 获取二进制数据以告知保存了多少属性

Question

我下面的快速代码需要 2 个图像文字，然后保存到核心数据中。我只想在 func fetch 中打印 dubgg 区域中有多少属性保存到核心数据中。所以在调试部分它应该说在调试部分保存了 2 个项目。

import UIKit
import CoreData

class ViewController: UIViewController {


let appDelegate = UIApplication.shared.delegate as! AppDelegate //Singlton instance

lazy var context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

var piczy = [UIImage]()

override func viewDidLoad() {
    super.viewDidLoad()

    let newUser = User(context: context)
    let newUser2 = User(context: context)
    newUser.pic = #imageLiteral(resourceName: "Jessica").jpegData(compressionQuality: 0.9) as NSObject?


    newUser2.pic =  #imageLiteral(resourceName: "Jessica").jpegData(compressionQuality: 0.9) as NSObject?



    save()

}
func save() {

    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "User")

    do {

     let jake =   try context.count(for: fetchRequest)

        print(jake)

    } catch let error as NSError {
        print("Could not fetch \(error) ")
    }

}