How to pass selected row value as a public variable available to multiple view controllers? - ios

Question

How to have pass the value of a selected tableView to a public variable that can be accessed by multiple ViewControllers? Currently, in didSelectRowAt, I define the row selected as portfolio doing let portfolio = structure[indexPath.row] Now how can I save this value to perhaps some sort of variable that makes it avalible to multiple view controller?
I don't just mean pushing the value to whichever view controller is being presented when the cell is pressed, I need it be available to view controller past the .pushViewController.
In the past I tried using userdefaults, but this is not appropriate for values that are constantly changing and are not permanen.
import UIKit
class ScheduledCell: UITableViewCell {
#IBOutlet weak var ETALabel: UILabel!
#IBOutlet weak var cellStructure: UIView!
#IBOutlet weak var scheduledLabel: UILabel!
#IBOutlet weak var testingCell: UILabel!
#IBOutlet weak var pickupLabel: UILabel!
#IBOutlet weak var deliveryLabel: UILabel!
#IBOutlet weak var stopLabel: UILabel!
#IBOutlet weak var topBar: UIView!
}
class ToCustomerTableViewController: UITableViewController, UIGestureRecognizerDelegate {
var typeValue = String()
var driverName = UserDefaults.standard.string(forKey: "name")!
var structure = [AlreadyScheduledStructure]()
override func viewDidLoad() {
super.viewDidLoad()
fetchJSON()
//Disable delay in button tap
self.tableView.delaysContentTouches = false
tableView.tableFooterView = UIView()
}
private func fetchJSON() {
guard let url = URL(string: "https://example.com/example/example"),
let value = driverName.addingPercentEncoding(withAllowedCharacters: .urlQueryValueAllowed)
else { return }
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = "driverName=\(value)".data(using: .utf8)
URLSession.shared.dataTask(with: request) { data, _, error in
guard let data = data else { return }
do {
self.structure = try JSONDecoder().decode([AlreadyScheduledStructure].self,from:data)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
catch {
print(error)
}
}.resume()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return structure.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "scheduledID", for: indexPath) as! ScheduledCell
let portfolio = structure[indexPath.row]
cell.stopLabel.text = "Stop \(portfolio.stop_sequence)"
cell.testingCell.text = portfolio.customer
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let portfolio = structure[indexPath.row]
let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "scheduledDelivery")
print(portfolio.customer)
controller.navigationItem.title = navTitle
navigationController?.pushViewController(controller, animated: true)
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 200.0
}
}

Answer 1

You can use a function to pass an optional Value inside an extension, try the following:
From what I understood you want to pass values from your viewController and be able to get it from any other viewController..
extension UIViewController {
func passData(row: Int?) -> Int? {
var myValue = Int()
if row != nil {
myValue = row!
}
return myValue
}
}
in this function you can Pass the value you want and also retrieve it.
to pass data into the function simply use this :
passData(row: indexPath.row)
and if you want to retrieve the value of it from another viewController use this:
let myValue = passData(row: nil)
this way you could get the Data you pass from another viewController..
if that didn't work for you I'd suggest you use UserDefaults ..
I hope this could solve your problem.

Answer 2

You can use NSNotificationCenter and post value after selection and every subscribed controller will received a new value. For more info read this NSNotificationCenter addObserver in Swift