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For some reason I can't figure out how to save images to core data and fetch them again. I have a feeling it's something about my types but have a look:

I get my data from an api call to my server. It returns a base64 string.
Here is where I get the data:

updateAccessTokenOnly(newAccessToken: aToken!)
saveImageToDB(brandName: imageBrandName, image: data! )

Here I save it to my DB:

func saveImageToDB(brandName: String, image: Data) 
 dropImages()tableDropped in
 let managedContext = getContext()
 let entity = NSEntityDescription.entity(forEntityName: "CoffeeShopImage", in: managedContext)!
 let CSI = NSManagedObject(entity: entity, insertInto: managedContext)

 CSI.setValue(image, forKey: "image")
 CSI.setValue(brandName, forKey: "brandName")

 do 
 try managedContext.save()
 print("saved!")
 catch let error as NSError 
 print("Could not save. (error), (error.userInfo)")
 
 

then to fetch it:

 func getImageFromDB(callback: @escaping (_ image: UIImage)-> ()) 

 let fetchRequest: NSFetchRequest<NSManagedObject> = NSFetchRequest(entityName: "CoffeeShopImage")

 do 
 let searchResults = try getContext().fetch(fetchRequest)

 for images in searchResults 
 print("vi når her ned i get image")
 if (images.value(forKey: "brandName")! as! String == "Baresso")
 print(images.value(forKey: "brandName")! as! String)

 let image: Data = images.value(forKey: "image")! as! Data
 let decodedimage = UIImage(data: image)

 callback(decodedimage!)

 
 
 catch 
 print("Error with request: (error)")
 

Full error log:

https://docs.google.com/document/d/1gSXE64Sxtzo81eBSjv4bnBjBnnmG4MX2tuvNtnuJDIM/edit?usp=sharing

Hope someone can help. Thanks in advance!

UPDATED

So I uninstalled the app and then the code above worked. However the pictures come out blue? (yes I've checked that the pictures sent from the database are correct).

Any solution?

replace

let image: Data = images.value(forKey: "image")! as! Data
let dataDecoded : Data = Data(base64Encoded: image, options: )!
let decodedimage = UIImage(data: dataDecoded)

with

let image: Data = images.value(forKey: "image")! as! Data
let decodedimage = UIImage(data: image)

Base64 is a way to to convert data to a string. There is no reason to use it here. You already have the data from the database you just want to convert it to a UIImage.

also change

let image = data?.base64EncodedData()
saveImageToDB(brandName: imageBrandName, image: image!)

to

saveImageToDB(brandName: imageBrandName, image: data!)

base64EncodedData is turning the data from image data into a utf-8 encoded based64encoded string. There is no reason for that.

You should get the base64 encoded string from server, convert it to data and then you never need base64 again. Read and write data to your database, and after you read it convert it to a UIImage. Base64 is an encoding method to transfer data. If you are not talking to the server there is no reason to use base64.

After the suggested corrections from Jon Rose all I needed was to add

.withRenderingMode(.alwaysOriginal)

to where I was showing my picture and the code worked.

Saving Image:

 guard let managedObjectContext = managedObjectContext else return 

 // Create User
 let user = User(context: managedObjectContext)

 // Configure User
 user.name = "name"
 user.about = "about"
 user.address = "Address"
 user.age = 30
 if let img = UIImage(named: "dog.png") 
 let data = img.pngData() as NSData?
 user.image = data
 

Fetching Image:

// Create Fetch Request
 let fetchRequest: NSFetchRequest<User> = User.fetchRequest()

 // Configure Fetch Request
 fetchRequest.sortDescriptors = [NSSortDescriptor(key: "name", ascending: true)]
 let users = try! managedContext.fetch(fetchRequest)
 let user: User = users.first as! User
 if let imageData = user?.image 
 imgView.image = UIImage(data: imageData as Data)