How to change the label of a different view controller when selecting data from a tableviewcontrollerin Swift 3 / xCode 8? - ios

Question

I have a view controller which is used as a table view. From the table view I wish to select an item from the rows available and once selected I wish for that chosen thing to be the name of a label in a second view controller.
So
tableViewController - select an item from the list in the table
secondViewcontroller - label name is what is selected in the tableViewController
I have looked around and there is talk of using NSNotification but I can't seem to get it to work, in addition to using prepareForSegue.
My relevant code for the tableViewContrller is this:
//MARK Table View
//number of sections the table will have
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
//number of rows each section of the table will have
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return peripheralArray.count
}
//the way the data will be displayed in each row for the sections
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let BluetoothNaming = peripheralArray[indexPath.row].peripheral.name
cell.textLabel?.text = BluetoothNaming
return cell
}
//what happens when we select an item from the bluetooth list
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
stopScanning()
peripheral = peripheralArray[(indexPath as NSIndexPath).row].peripheral
print ("connecting to peripheral called \(peripheral)")
//store the name of the connected peripeheral
let connectedPeripheral = peripheral
manager?.connect(connectedPeripheral!, options: nil)
performSegue(withIdentifier: "segueBackwards", sender: nil)
}
My secondViewController does not have much on its just the label:
import UIKit
class HomepageViewController: UIViewController {
#IBOutlet var ConnectionLabel: UILabel!
func changeBlueoothLabel() {
self.ConnectionLabel.text = "aaaa"
}
}
What do I need to do so that when I select a row in the table that the label in the secondViewController changes its label to reflect it.
Furthermore, if I wanted to change it so that I have another label on the secondViewController and I wanted to change it from disconnected to connected, would there be much more work involved?
Many thanks

Answer 1

to pass data add a string variable in the HomepageViewController and implement prepareForSegue method to pass selected name from tableViewController to HomepageViewController
in HomepageViewController
var selectedName: String?
in tableViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showHomePage" {
if let indexPath = self.tableView.indexPathForSelectedRow {
let peripheral = peripheralArray[indexPath.row].peripheral.name
let homeController = segue.destination as! HomepageViewController
homeController.selectedName = peripheral
}
}
in HomepageViewController
import UIKit
class HomepageViewController: UIViewController {
#IBOutlet var ConnectionLabel: UILabel!
var selectedName: String?
override func viewDidLoad() {
super.viewDidLoad()
// Used the text from the First View Controller to set the label
if let name = selectedName {
ConnectionLabel.text = name
}
}
}