Pass data from containerView to MainViewControler - ios

Question

I have this code:
MainViewControler:
class MainViewControler: UIViewController, ContainerToMaster {
#IBOutlet weak var systemContainerView: UIView!
#IBOutlet weak var favoriteProductBtn2: UIButton!
weak var containerViewController: Calculator1ViewController?
func changeBtn() {
favoriteProductBtn2.isHidden = true
print("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
}
}
CallculatorViewController:
#IBOutlet weak var containerView: UIView!
class CallculatorViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
Calculator1ViewController:
protocol ContainerToMaster {
func changeBtn()
}
class Calculator1ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
containerToMaster?.changeBtn()
}
}
I have such an application layout:
Main view = MainViewControler.
In MainViewControler, I have a containerView (systemContainerView) in which the MainViewControler is located
In the CallculatorViewController, I have the next containerView in which the Calculator1ViewController is located.
When entering the Calculator1ViewController the function: containerToMaster?.changeBtn() should start (it should work in MainViewControler).
The problem is - this function does not work :(
Does anyone know how to fix it?

Answer 1

A contained viewController is embedded with an embed segue. You need to override prepare(for:sender) and set self as the containerToMaster delegate in the destination viewController. Your situation is complicated by the fact that you have a container view embedded in another container view, so you'll need to set up two delegates and pass the button call back:
protocol ContainerToMaster {
func changeBtn()
}
class MainViewControler: UIViewController, ContainerToMaster {
#IBOutlet weak var systemContainerView: UIView!
#IBOutlet weak var favoriteProductBtn2: UIButton!
weak var containerViewController: Calculator1ViewController?
func changeBtn() {
favoriteProductBtn2.isHidden = true
print("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destVC = segue.destination as? CallculatorViewController {
destVC.containerToMaster = self
}
}
}
class CallculatorViewController: UIViewController, ContainerToMaster {
weak var containerToMaster: ContainerToMaster?
override func viewDidLoad() {
super.viewDidLoad()
}
func changeBtn() {
// pass the button call back
containerToMaster?.changeBtn()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destVC = segue.destination as? Calculator1ViewController {
destVC.containerToMaster = self
}
}
}
class Calculator1ViewController: UIViewController {
weak var containerToMaster: ContainerToMaster?
override func viewDidLoad() {
super.viewDidLoad()
containerToMaster?.changeBtn()
}
}