Updating labels on secondViewController with data from tableViewController - ios

Question

I have a tableView as initial controller and few labels in secondViewController.
When I create a cell with data I want, the idea is to display that data in the secondViewController labels. All works fine, BUT, the labels in the secondVC update only when I hit the back button, to go back to the table view and select the row again.
How can I update the data displayed in the secondVC on the first tap in the tableview cell?
enter code here
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
var titles = [String]()
var subjects = [String]()
var previews = [String]()
var textFieldsText = [UITextField!]()
var selectedTitle: String!
var selectedSubject: String!
var selectedPreview: String!
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Add, target: self, action: "addTitle")
}
override func viewDidAppear(animated: Bool) {
tableView.reloadData()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
cell.textLabel?.text = titles[indexPath.row]
cell.detailTextLabel?.text = subjects[indexPath.row]
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return titles.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedTitle = self.titles[indexPath.row]
selectedSubject = self.subjects[indexPath.row]
selectedPreview = self.previews[indexPath.row]
tableView.reloadData()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showPreview" {
let dataToPass = segue.destinationViewController as! previewViewController
dataToPass.titlesString = selectedTitle
dataToPass.subjectsString = selectedSubject
dataToPass.previewsString = selectedPreview
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func addTitle() {
let addAlert = UIAlertController(title: "New Title", message: "Add new title, subject and a short preview", preferredStyle: .Alert)
addAlert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
addAlert.addTextFieldWithConfigurationHandler {[unowned self] textField in
textField.placeholder = "Add Title"
textField.textAlignment = .Center
self.textFieldsText.append(textField)
}
addAlert.addTextFieldWithConfigurationHandler { textField in
textField.placeholder = "Add Subject"
textField.textAlignment = .Center
self.textFieldsText.append(textField)
}
addAlert.addTextFieldWithConfigurationHandler { textField in
textField.placeholder = "Add Short Preview"
textField.textAlignment = .Center
self.textFieldsText.append(textField)
}
addAlert.addAction(UIAlertAction(title: "Done", style: .Default){ _ in
self.titles.append(self.textFieldsText[0].text!)
self.subjects.append(self.textFieldsText[1].text!)
self.previews.append(self.textFieldsText[2].text!)
self.tableView.reloadData()
self.textFieldsText.removeAll()
})
presentViewController(addAlert, animated: true, completion: nil)
}
}
class previewViewController: UIViewController {
#IBAction func readButton(sender: UIButton) {
}
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var subjectLabel: UILabel!
#IBOutlet weak var shortPreviewLabel: UITextView!
var titlesString: String!
var subjectsString: String!
var previewsString: String!
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Save, target: self, action: "saveChanges")
titleLabel.text = titlesString
subjectLabel.text = subjectsString
shortPreviewLabel.text = previewsString
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
let dataToDetail = segue.destinationViewController as! detailViewController
dataToDetail.textViewString = self.previewsString
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}

Answer 1

If I understand your question right, this may help:
use this didSelectRowAtIndexPath:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
performSegueWithIdentifier("showPreview", sender: indexPath.row)
}
use this prepareForSegue:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showPreview" {
let destinationViewController = segue.destinationViewController as! previewViewController
if let index = sender as? Int {
destinationViewController.titlesString = self.titles[index]
destinationViewController.subjectsString = self.subjects[index]
destinationViewController.previewsString = self.previews[index]
}
}
}
And you need to have a segue from ViewController to previewViewController called "showPreview". Like this: