Passing selected String in uiTableView from Array to uiLabel in new ViewController - arrays

Question

I have my array, my tableview setup and the table shows the array of strings. 80+ strings in an array.
Now, I select a row, and obviously I want to pass the string in that row to a uiLabel in a secondary ViewController.
placeTypes is my declared array that is not in this posted code, just imagine an array with 84 strings! My segueIdentifier is A <- easy peasy. And passedString is the uiLabel that will receive the ..well...passed string data.
TableView code
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return placeTypes.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = placeTypes[indexPath.row]
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
NSLog("You selected cell number: \(indexPath.row)!")
performSegue(withIdentifier: "A", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "A" {
// let viewController = segue.destination as? ViewController
// SOMEHOW PASS THE SELECTED STRING IN THE SELECTED ROW TO THE VIEW CONTROLLER
}
}
Okay and now my ViewController code
#IBOutlet weak var passedString: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
EDIT: I am still getting errors. With the updated prepare for segue I get use of unresolved Identifier for placeTypes[indexPath.row] and viewController is telling me there is no sendString variable.

Answer 1

class TableViewController: UITableViewController {
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Row number: \(indexPath.row)")
performSegue(withIdentifier: "A", sender: indexPath)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "A" {
if let viewController = segue.destination as ViewController,
let indexPath = sender as IndexPath {
viewController.sendString = placeTypes[indexPath.row]
}
}
}
}
class ViewController : UIViewController {
#IBOutlet weak var passedString: UILabel!
// Put the string you need to send in a separate var
// You can't rely on the view controller being properly initalized
var sendString: String?
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let sendString = sendString {
passedString.text = sendString
}
}
}
You can also take a look at legendary-potato: https://github.com/ryantxr/legendary-potato

Answer 2

In did didSelectRowAt pass indexPath as sender and in prepare you can cast it to IndexPath. Try this.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
NSLog("You selected cell number: \(indexPath.row)!")
performSegue(withIdentifier: "A", sender: indexPath)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "A" {
let indexPath = sender as? IndexPath {
let yourText = placeTypes[indexPath.row]
// let viewController = segue.destination as? ViewController
// SOMEHOW PASS THE SELECTED STRING IN THE SELECTED ROW TO THE VIEW CONTROLLER
}
}
}