How do I save a users check mark selection in iOS - ios

Question

I am currently trying to save a users check mark selection in iOS. I have a custom made empty check box and a box with the check mark. I have gotten to change when I click it, but I am unsure how to save the checkmark to user defaults after the app is closed. I know how to do this for text and slider buttons but I just can't figure it out for these images. I am programming in Swift and your help is very much appreciated. I already have some of the code setup but I could be wrong on it all.
import UIKit
class TableViewChallengeTrackerTableViewController: UITableViewController {
//checkboxes
#IBOutlet weak var checkBoxButton1: UIButton!
var saveCheckBoxes = UserDefaults.standard
//saving keys
let checkBoxSave01 = "checkBoxSave01"
override func viewDidLoad() {
super.viewDidLoad()
//check box #1 images
checkBoxButton1.setImage(UIImage(named:"greyUnchecked"), for: .normal)
checkBoxButton1.setImage(UIImage(named:"greyChecked"), for: .selected)
//loading the saved check box
if saveCheckBoxes.object(forKey: checkBoxSave01) != nil{
}
}
//check box changed/check box had heptic/saving user selection
let impact = UIImpactFeedbackGenerator(style: UIImpactFeedbackStyle.medium)
#IBAction func checkBoxTapped(_ sender: UIButton) {
saveCheckBoxes.set(sender.currentImage, forKey: checkBoxSave01)
impact.impactOccurred()
UIView.animate(withDuration: 0.0, delay: 0.0, options: .curveLinear, animations: {
sender.transform = CGAffineTransform(scaleX: 0.0, y: 0.0)
}) { (success) in
UIView.animate(withDuration: 0.0, delay: 0.0, options: .curveLinear, animations: {
sender.isSelected = !sender.isSelected
sender.transform = .identity
}, completion: nil)
}
}
}

Answer 1

Save the value as a boolean, not as the image. Then when you load this view controller, get that boolean value from defaults. If it is true, check the checkbox. If it is false, do not check the checkbox.
UserDefaults.standard.set(true, forKey: "checkBoxSave01")
When trying to setup the checkboxes later, you can do something like this in viewDidLoad:
if UserDefaults.standard.bool(forKey: "checkBoxSave01") == true {
// Configure the checkbox as checked
} else {
// Configure the checkbox as unchecked
}
bool(forKey:) will return true if the value set at that key is true. It will return false if the value was set to false or if there is no value at that key.

Answer 2

This might help you. And you can easily modify it to suit your needs.
enum UserDefaultsKeys : String {
case someBox
case anotherBox
}
extension UserDefaults{
func setSomeBox(value : Bool){
set(value, forKey: UserDefaultsKeys.someBox.rawValue)
}
func getSomeBox() -> Bool {
return bool(forKey: UserDefaultsKeys.someBox.rawValue)
}
func setAnotherBox(value : Bool){
set(value, forKey: UserDefaultsKeys.anotherBox.rawValue)
}
func GetAnotherBox() -> Bool {
return bool(forKey: UserDefaultsKeys.anotherBox.rawValue)
}
}