Swift 5 Delegates Does not Listen the Event - delegates

Question

protocol NewHomeVCDelegate {
func didEditHabit(_ habit: Habit)
}
class NewHomeVC: {
var newHomeVCDelegate : NewHomeVCDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
func didButtonTapped() {
self.newHomeVCDelegate?.didEditHabit(habit)
let vc = NewCreateHabitVC()
vc.modalPresentationStyle = .popover
self.present(vc, animated: true)
}
}
class NewCreateHabitVC: NewHomeVCDelegate {
func didEditHabit(_ habit: Habit) {
updateUI(habit: habit)
}
override func viewDidLoad() {
super.viewDidLoad()
setViews()
setDelegates()
addGestureRecognizer()
var newHomeVC = NewHomeVC()
newHomeVC.newHomeVCDelegate = self
}
func updateUI(habit: Habit) {
// it does some stuff here
}
}
I am trying to pass habit object from NewHomeVC to NewCreateHabitVC via delegate and protocol. However the problem is that the delegate does not listen. Can someone show me what I am doing wrong here? Thanks.

Answer 1

struct Habit {
let name : String
enum CodingKeys: String, CodingKey {
case name = "name"
}
}
protocol NewHomeVCDelegate {
func didEditHabit(_ habit: Habit)}
class NewHomeVC: UIViewController , NewHomeVCDelegate{
//var newHomeVCDelegate : NewHomeVCDelegate?
let myHabit = Habit(name: "I want to edit this habit")
override func viewDidLoad() {
super.viewDidLoad()
}
func didButtonTapped() {
//no need here
//self.newHomeVCDelegate?.didEditHabit(habit)
//when you present the ViewController you the set the delegate, so he can ping you back once done. Also you need to set the object that you intend to edit
let vc = NewCreateHabitVC()
vc.newHomeVCDelegate = self
vc.habitThatIwantToEdit = myHabit
vc.modalPresentationStyle = .popover
self.present(vc, animated: true)
}
//you have to implement this method in home class
func didEditHabit(_ habit: Habit) {
//this object is the final edited object from NewCreateHabitVC, this will be called on finish button press, here you have it.
}
}
class NewCreateHabitVC: UIViewController, NewHomeVCDelegate {
//but here
var newHomeVCDelegate : NewHomeVCDelegate?
var habitThatIwantToEdit :Habit?
func didEditHabit(_ habit: Habit) {
//
//updateUI(habit: habit)
}
override func viewDidLoad() {
super.viewDidLoad()
//setViews()
//setDelegates()
//addGestureRecognizer()
//var newHomeVC = NewHomeVC()
//newHomeVC.newHomeVCDelegate = self
if let _ = habitThatIwantToEdit{
updateUI(habit: habitThatIwantToEdit!)
}else{
print("object not set")
}
}
func updateUI(habit: Habit) {
// it does some stuff here
}
func finishButtonTaped(){
if let habit = habitThatIwantToEdit{
newHomeVCDelegate?.didEditHabit(habit)
}
}
}