Is there a way to change a UIBarButtonItem immediately in Swift? - ios

Question

I added a "favorite icon" (a heart) in the top Navigation Bar:
var faveMeItem = UIBarButtonItem (title: dua.isFavorite() ? "❤️" : "💔", style: .Plain, target: self, action: "toggleFav")
Is there a way to ensure it is changed (to a broken heart) as soon as it is tapped?
I have to go back to the tableView and come back to the detail, and then I see the updated icon. Tapping on it does the logic, but the heart is not updated. These are the functions in my Dua Class.
func removeFromFavorites() {
//retrieve all favorites
let favoriteDuaIds = NSUserDefaults.standardUserDefaults().objectForKey(Dua.favoriteDuasKey) as! [Int]?
if let favoriteDuaIds = favoriteDuaIds {
//iterate through all Duas and comapre their IDs
let newFavoriteDuaIds = favoriteDuaIds.filter { favoriteDuaId in
return favoriteDuaId != duaId
}
NSUserDefaults.standardUserDefaults().setObject(newFavoriteDuaIds, forKey: Dua.favoriteDuasKey)
}
}
func isFavorite() -> Bool {
//retrieve all favorites
let favoriteDuaIds = NSUserDefaults.standardUserDefaults().objectForKey(Dua.favoriteDuasKey) as! [Int]?
if let favoriteDuaIds = favoriteDuaIds {
//iterate through all Duas and comapre their IDs
for favoriteDuaId in favoriteDuaIds {
print (favoriteDuaId)
if favoriteDuaId == duaId {
return true
}
}
}
return false
}
func toggleFavorite() {
if isFavorite() {
removeFromFavorites()
} else {
addToFavorites()
}
}
class func favorites() -> [Dua] {
let favoriteDuaIds = NSUserDefaults.standardUserDefaults().objectForKey(favoriteDuasKey) as! [Int]?
if let favoriteDuaIds = favoriteDuaIds {
return DuasDataSource.duas.filter { dua in
return favoriteDuaIds.contains(dua.duaId)
}
} else {
return []
}
}
}

Answer 1

func toggleFavorite() {
if isFavorite() {
removeFromFavorites()
} else {
addToFavorites()
}
faveMeItem.title = dua.isFavorite() ? "❤️" : "💔" //Add this
}