How do I save and show a Image with core data - swift 3

Question

I am doing a project in Swift 3 - xcode 8, and I am trying to use core data to save and show some images in a data base table "users". This image is the user photo in his profile.

Now I've managed to save strings and showing them from core data but I am having problems in working this out with images.

This is what I have so far:

Adding USERS into core data

func addUser() {
    let app = UIApplication.shared.delegate as! AppDelegate
    let context = app.persistentContainer.viewContext
    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
    request.returnsObjectsAsFaults = false

    let newUser = NSEntityDescription.insertNewObject(forEntityName: "Users", into: context)

    if (firstName.text == "" && lastName.text == "" && contact.text == "" && email.text == "") { //if we have a user profile delete it
        deleteUser()
    } else { // add a new user profile
        newUser.setValue(firstName.text, forKey: "firstName")
        newUser.setValue(lastName.text, forKey: "lastName")
        newUser.setValue(contact.text, forKey: "contact")
        newUser.setValue(email.text, forKey: "email")

        //newUser.setValue(imageView.image, forKey: "photo")
        //let imgUrl = UIImagePickerControllerReferenceURL as! NSURL
        let img = UIImage(named: "f.png")
        let imgData = UIImageJPEGRepresentation(img!, 1)

        newUser.setValue(imgData, forKey: "photo")

        print ("Data added in Users")
    }
    do {
        try context.save()
        //print("saved!!!")
        Alert.show(title: "Success", message: "Profile Saved", vc: self)
    } catch {
       // print ("Error")
        Alert.show(title: "Error", message: "Profile not Saved", vc: self)
    }
}

Showing Users from core data

func showUser() {
    let app = UIApplication.shared.delegate as! AppDelegate
    let context = app.persistentContainer.viewContext
    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")

    request.returnsObjectsAsFaults = false

    do {
        let results = try context.fetch(request)

        if results.count > 0 {
            print("Profile: Data Found:")
            for result in results as! [NSManagedObject] {
               if let firstNameinData = result.value(forKey: "firstName") as? String{
                    firstName.text = firstNameinData
                    print(firstNameinData)
                }

                if let lastNameinData = result.value(forKey: "lastName") as? String{
                    lastName.text = lastNameinData
                    print(lastNameinData)
                }

                if let contactinData = result.value(forKey: "contact") as? String{
                    contact.text = contactinData
                    print(contactinData)
                }

                if let emailinData = result.value(forKey: "email") as? String{
                    email.text = emailinData
                    print(emailinData)
                }

                if let photoinData = result.value(forKey: "photo") as? UIImage{
                    imageView.image = photoinData
                }
            }
        } else {  // if there is not a user profile
            firstName.text = ""
            lastName.text = ""
            contact.text = ""
            email.text = ""
            print("Profile : No data found")
        }
        //print("Loaded!!!")
    } catch {
        print ("Error Loading")
    }
}

I cannot show the image I have saved. Do you have any tips?

EDIT: Xcode gives me this message "Connection to assetsd was interrupted or assetsd died"

Answer 1

The property photo of Users is (NS)Data, as you do there, converting the

UIImage into NSData.

let img = UIImage(named: "f.png")
let imgData = UIImageJPEGRepresentation(img!, 1)
newUser.setValue(imgData, forKey: "photo")

While when you retrieve the info, you are doing like photo was a UIImage object:

if let photoinData = result.value(forKey: "photo") as? UIImage{
    imageView.image = photoinData
}

This is not logical according to previous lines. It should be something like that:

if let imageData = result.value(forKey: "photo") as? NSData {
    if let image = UIImage(data:imageData) as? UIImage {
        imageView.image = image
    }
}

Note: I don't speak Swift, so the proposed code may not compile, but you should get the idea of what's wrong and what's need to be done.

Answer 2

Larme has it almost spot on, but instead of this:

if let image = UIImage(data:imageData) as? UIImage

do this:

if let image = UIImage(data: imageData as Data)