Styjun

I am using network request to retrieve data from back-end in ViewController and this view contains three containers so, I want to pass these data into containers. that fails while I am using prepare for segue.

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 

 if segue.identifier == "ContinueSurvey" 
 let continueSurveyVC = segue.destination as! ContinueSurveyVC
 continueSurveyVC.notComplatedSurveies = notComplatedSurveies
 else if segue.identifier == "LatestOffers" 
 let latestOffersVC = segue.destination as! LatestOffersVC
 latestOffersVC.latestOffers = latestOffers
 else if segue.identifier == "LatestSurvey" 
 let latestSurveyVC = segue.destination as! LatestSurveyVC
 latestSurveyVC.latestSurveies = latestSurveies
 

This might help: https://learnappmaking.com/pass-data-between-view-controllers-swift-how-to/

Here’s a view controller MainViewController with a property called
text:

class MainViewController: UIViewController

 var text:String = ""

 override func viewDidLoad()
 
 super.viewDidLoad()
 

Whenever you create an instance of MainViewController, you can assign
a value to the text property. Like this:

let vc = MainViewController()
vc.text = "Hammock lomo literally microdosing street art pour-over"

This is the code for the view controller:

class SecondaryViewController: UIViewController

 var text:String = ""

 @IBOutlet weak var textLabel:UILabel?

 override func viewDidLoad()
 
 super.viewDidLoad()

 textLabel?.text = text
 

Then, here’s the actual passing of the data… Add the following method
to MainViewController:

@IBAction func onButtonTap()

 let vc = SecondaryViewController(nibName: "SecondaryViewController", bundle: nil)
 vc.text = "Next level blog photo booth, tousled authentic tote bag kogi"

 navigationController?.pushViewController(vc, animated: true)

you can use present ViewController and in presented ViewController in viewWillAppear check what happened:

present VeiwController:

let vc = self.storyboard?.instantiateViewController(withIdentifier: "yourViewControllerIdentifire") as! yourViewController
self.present(vc, animated: true, completion: nil)

& in yourViewContriller use viewWillAppear to pass those data into containers:

override func viewWillAppear(_ animated: Bool) 
 super.viewWillAppear(animated)
 //pass those data into containers

If you want to update child controllers when they already loaded, you need to store reference on them in parent controller and then in desire moment of time update data as:

weak var continueSurveyVC: ContinueSurveyVC?
weak var latestOffersVC: LatestOffersVC?
weak var latestSurveyVC: LatestSurveyVC?

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
 if segue.identifier == "ContinueSurvey" 
 continueSurveyVC = segue.destination as! ContinueSurveyVC
 continueSurveyVC?.notComplatedSurveies = notComplatedSurveies
 else if segue.identifier == "LatestOffers" 
 latestOffersVC = segue.destination as! LatestOffersVC
 latestOffersVC?.latestOffers = latestOffers
 else if segue.identifier == "LatestSurvey" 
 latestSurveyVC = segue.destination as! LatestSurveyVC
 latestSurveyVC?.latestSurveies = latestSurveies
 


/// Call this method anytime you want to update children data
func updateChildData() 
 continueSurveyVC?.notComplatedSurveies = notComplatedSurveies
 latestOffersVC?.latestOffers = latestOffers
 latestSurveyVC?.latestSurveies = latestSurveies