How can I run prepareForSegue After didSelectRowAtIndexPath? - ios

Question

I'm trying to get the indexPath.row that user clicked and then check with my array to return a String from that indexPath.row and then send the String via preparforSegue.... But it doesnt work. I think the program runs the preparForSegue BEFORE the didselectRowatIndexPath... How can I do this?
My Code:
import UIKit
import Parse
class CategoriaTableViewController: UITableViewController {
var queryArray: [PFObject] = [PFObject]()
var escolha = 5
override func viewDidLoad() {
super.viewDidLoad()
var query = PFQuery(className:"Categorias")
//querycomlocalidade
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
println("Successfully retrieved \(objects!.count) Restaurantes.")
if let _objects = objects as? [PFObject] {
self.queryArray = _objects
self.tableView.reloadData()
}
} else {
println("Error: \(error!) \(error!.userInfo!)")
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return queryArray.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> CategoriaTableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("ceculaCategoria", forIndexPath: indexPath) as! CategoriaTableViewCell
let categoria = queryArray[indexPath.row] as! PFObject
//Insere texto
cell.tituloCecula.text = categoria.objectForKey("nome") as! String
//Insere imagens no tableview
if let categoriaImagem = categoria.objectForKey("imagem") as? PFFile {
categoriaImagem.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in
if (error == nil) {
cell.imagemCecula.image = UIImage(data:imageData!) }
}
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
escolha = indexPath.row
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var detailScene = segue.destinationViewController as! ListaTableViewController
if let indexPath = self.tableView.indexPathForSelectedRow() {
let row = Int(indexPath.row)
let categoriaEscolhida = queryArray[escolha] as PFObject
//Insere texto
detailScene.categoria = categoriaEscolhida.objectForKey("nome") as! String
}
}
}

Answer 1

If you have linked the segue directly from your cell in the storyboard then didSelectRowAtIndexPath will not execute before the segue is triggered.
What you can do is create a segue by Ctrl-dragging from the view controller object in the storyboard to the destination scene and giving the segue an identifier as you would with any other segue. Delete the segue from your cell.
Now you can call performSegueWithIdentifier to trigger the segue and pass the object that was selected as the sender
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
// tableView.deselectRowAtIndexPath(indexPath) // Optionally deselect the row for a cleaner appearance
self.performSegueWithIdentifier("mySegueIdentifier", sender: queryArray[indexPath.row])
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let detailScene = segue.destinationViewController as? ListaTableViewController {
let categoriaEscolhida = sender as! PFObject
detailScene.categoria = categoriaEscolhida.objectForKey("nome") as! String
}
}

Answer 2

You need to create the segue between the two view controllers and trigger it manually:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
escolha = indexPath.row
self.performSegueWithIdentifier("push", sender: self)
}

Answer 3

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
escolha = indexPath.row
self.performSegueWithIdentifier("push", sender: self)
}
Complete with ...
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:"push"]) {
// Code
}