Odtnhj

I need to be able to set the background image for this button. I need to store this so after the app closes the background image is the same.

eventsFirstButton.backgroundColor = UIColor(patternImage: UIImage(named: "events")!)

You could just save the state:

Correct answer:

UserDefaults.standard.set(true, forKey: "TestAnswer1")
//If the answer is incorrect set to false

On load:

 if UserDefaults.standard.bool(forKey: "TestAnswer1") 
 view.backgroundColor = UIColor.green
 // or any other logic
 else 
 view.backgroundColor = UIColor.red
 // or any other logic
 

It's better to save it as base64string, you don't want to store large value to UserDefaults.

To encode UIImage use this:

let image = UIImage()
let data = image.pngData()
let imageBase64String = data?.base64EncodedString()
UserDefaults.standard.set(imageBase64String, forKey: "encodedImage")

And for decoding and retrieving UIImage use this:

if let imageBase64String = UserDefaults.standard.value(forKey: "encodedImage"),
 let url = URL(string: String(format:"data:application/octet-stream;base64,%@",imageBase64String))

 do
 
 let data = try Data(contentsOf: url) 
 let image = UIImage(data: data)
 
 catch let error
 
 print("Error decoding image") 
 

If you really need to save the PNG, JPEG images locally, use CoreData to store them on the device.

You can use UserDefaults to save your image

Save

if let image = eventsFirstButton.imageView?.image 
 let imageData = image.pngData()
 UserDefaults.standard.set(imageData, forKey: "imageData")
 

Retrieve

if let imageData = UserDefaults.standard.data(forKey: "imageData") 
 print("IMG data: ", imageData)
 // your code here