how to save and fetch button enable and disable value using Userdefaults - ios

Question

I want to save the button enable and disable value in userdefault. I wrote the following code but nothing happened. Please tell me how to save and fetch button enable and disable value.
I want, when the ibaction button is pressed, it should disable and when closes the app and reopen the app then it should save the disable state of button.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var btn2: UIButton!
#IBOutlet weak var btn1: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// let def = UserDefaults.standard.bool(forKey: "val")
// btn1.isEnabled = def
}
override func viewWillAppear(_ animated: Bool) {
let def = UserDefaults.standard.bool(forKey: "val")
print(def)
//btn1.isEnabled = def
}
#IBAction func btn1Pressed(_ sender: UIButton) {
let def = UserDefaults.standard.bool(forKey: "val")
print("Button one pressed")
let otherAlert = UIAlertController(title: "Button 1!!", message: "Here is button one.", preferredStyle: UIAlertControllerStyle.alert)
let okaction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (UIAlertAction) in
print("OK pressed")
self.btn1.isEnabled = false
UserDefaults.standard.set(self.btn1.isEnabled, forKey: "val")
}
let dismiss = UIAlertAction(title: "No", style: UIAlertActionStyle.cancel) { (UIAlertAction) in
self.btn1.isEnabled = true
UserDefaults.standard.set(self.btn1.isEnabled, forKey: "val")
print("No pressed")
}
otherAlert.addAction(dismiss)
otherAlert.addAction(okaction)
present(otherAlert, animated: true, completion: nil)
let def1 = UserDefaults.standard.bool(forKey: "val")
btn1.isEnabled = def1
}
#IBAction func btn2Pressed(_ sender: UIButton) {
print("Button Two pressed")
}
}

Answer 1

Instead of saving self.btn1.isEnabled save the value you are applying to that. Can't you do this directly ?
override func viewDidLoad() {
super.viewDidLoad()
// You need to check if key is present or else you will get false as default value and your button will disabled only
if isKeyPresentInUserDefaults(key: "val") {
let def = UserDefaults.standard.bool(forKey: "val")
btn1.isEnabled = def
}
}
// Check key is present or not
func isKeyPresentInUserDefaults(key: String) -> Bool {
return UserDefaults.standard.object(forKey: key) != nil
}
#IBAction func btn1Pressed(_ sender: UIButton) {
let defaults = UserDefaults.standard
defaults.set(false, forKey: "val")
print("Button one pressed")
let otherAlert = UIAlertController(title: "Button 1!!", message: "Here is button one.", preferredStyle: UIAlertControllerStyle.alert)
let okaction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (UIAlertAction) in
print("OK pressed")
self.btn1.isEnabled = false
defaults.set(false, forKey: "val")
}
let dismiss = UIAlertAction(title: "No", style: UIAlertActionStyle.cancel) { (UIAlertAction) in
self.btn1.isEnabled = true
defaults.set(true, forKey: "val")
print("No pressed")
}
otherAlert.addAction(dismiss)
otherAlert.addAction(okaction)
present(otherAlert, animated: true, completion: nil)
// No need of these 2 lines
let def1 = defaults.bool(forKey: "val")
btn1.isEnabled = def1
}