How to pass textfield data from third viewcontroller to first viewcontroller - ios

Question

I want to send the text which is in textfield in ViewControllerC to another textfield which is in ViewControllerA
By using delegate am trying to pass the text from ViewControllerC to ViewControllerA.
i cant get the logic what to write here delegate?.userDidEnterInformation() in ViewControllerC
could any one help me regarding this
ViewControllerC
protocol DataEnteredInDestinationDelegate: class {
func userDidEnterInformation(info: String)
}
class DestinationSearchViewController: MirroringViewController {
var delegate: DataEnteredInDestinationDelegate?
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell: UITableViewCell? = tableView.cellForRow(at: indexPath)
componetsTextField.text = cell?.textLabel?.text
delegate?.userDidEnterInformation()
self.navigationController?.popToRootViewController(animated: true)
}
}
ViewControllerA
class HomeViewController: MirroringViewController, DataEnteredInDestinationDelegate
{
func userDidEnterInformation(info: String){
locationView.destination.text = info
}
}

Answer 1

Firstly you have to always mark delegate as weak e.g.:
weak var delegate: DataEnteredInDestinationDelegate?
and then you need to connect delegate like this:
let vcA = ViewControllerA()
let vcC = ViewControllerC()
vcC.delegate = vcA // Connect delegate
and then your delegate method in ViewControllerC will work after invoking this code:
delegate?.userDidEnterInformation(textString)

Answer 2

Here NotificationCentre can be a good approach instead of delegates. Make Viewcontroller A an observer to receive text information as below.
Write this code in viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(userDidEnterInformation(notification:)), name: NSNotification.Name.init(rawValue: "UserDidEnterInformation"), object: nil)
and write this anywhere in class Viewcontroller A
func userDidEnterInformation(notification: Notification) {
if let textInfo = notification.userInfo?["textInfo"] {
textField.text = textInfo
}
}
In Viewcontroller C post the notification with textInfo by writing below code
NotificationCenter.default.post(name: NSNotification.Name.init(rawValue: "UserDidEnterInformation"), object: nil, userInfo: ["textInfo": textField.text])

Answer 3

delegate?.userDidEnterInformation(cell!.textLabel!.text)
Also, you should set the delegate of ViewControllerC.
viewControllerC.delegate = viewControllerA

Answer 4

Consider the following example:-
let aVCobjA = UIViewController()
let aVCobjB = UIViewController()
let aVCobjC = UIViewController()
var aNavigation = UINavigationController()
func pushVC() {
aNavigation.pushViewController(aVCobjA, animated: true)
aNavigation.pushViewController(aVCobjB, animated: true)
aNavigation.pushViewController(aVCobjC, animated: true)
//Here you will get array of ViewControllers in stack of Navigationcontroller
print(aNavigation.viewControllers)
//To pass data from Viewcontroller C to ViewController A
self.passData()
}
// To pass data access stack of Navigation Controller as navigation controller provides a property viewControllers which gives you access of all view controllers that are pushed.
func passData() {
let aVCObj3 = aNavigation.viewControllers.last
let aVCObj1 = aNavigation.viewControllers[0]
//Now you have access to both view controller pass whatever data you want to pass
}