UserDefault To Save Button State

Question

I\'m trying to complete my favorite button by saving it state even when i quit the view \\ App . it will be great if anyone could show me how can i do this, I\'m using

Answer 1

Every time you use UserDefaults.standard.set you need sync , add UserDefaults.standard.synchronize().

To remove/delete a saved value use UserDefaults.standard.removeObject(forKey: "YOUR_KEY")

here is your func

@IBAction func button(sender: UIButton) {

    sender.isSelected = !sender.isSelected


    //one thing i tried , doesn't work :
    UserDefaults.standard.set(true,forKey: "isSaved")
    UserDefaults.standard.synchronize()


    if let Favoritebutton = sender as? UIButton {
        if Favoritebutton.isSelected {
            // set selected
            Favoritebutton.isSelected = true
            UserDefaults.standard.set(true, forKey: "MY_FAV_KEY")
            UserDefaults.standard.synchronize()
            //Add to favorites

        } else {
            // set deselected
            Favoritebutton.isSelected = false
            UserDefaults.standard.set(false, forKey: "MY_FAV_KEY")
            UserDefaults.standard.synchronize()
            //remove from Favorites

        }
    }
}