Swift - Segue on Dynamic TableCell - ios

Question

I'm learning swift, and i'm having problems trying to fire a segue when a TableViewCell is touched, which is supposed to pass an url to a second view that for the moment just a displays it in a label.
i Dynamically create ( i've seen people use Programmatically, which is probably the right word) every single Cell, so, in the storyboard i don't have any object to link to another view except the view itself... and that's what i did.
So i connected the first view controller to the second, and added the code to perform the segue.
i'm not sure if it's right, my knowledge comes from tutorials that didn't exactly explain what i wanted to do.
down there there's the code of the two views.
first view
import UIKit
protocol sendInfoDelegate{
func userDidEnterInfo( WhichInfo info : String)
}
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var tableData = []
#IBOutlet weak var redditListTableView: UITableView!
var selectedCellURL : String?
var delegate : sendInfoDelegate? = nil
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// change the link to change the json source
getRedditJSON("http://www.reddit.com/.json")
}
//
//Creates a connection via a task (networktask) then parses the json
//
func getRedditJSON(whichReddit : String){
let mySession = NSURLSession.sharedSession()
let url: NSURL = NSURL(string: whichReddit)
let networkTask = mySession.dataTaskWithURL(url, completionHandler : {data, response, error -> Void in
var err: NSError?
var theJSON = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSMutableDictionary
let results : NSArray = theJSON["data"]!["children"] as NSArray
dispatch_async(dispatch_get_main_queue(), {
self.tableData = results
self.redditListTableView.reloadData()
})
})
networkTask.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//needs to be implemented
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
//creates the whole table
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "MyTestCell")
let redditEntry : NSMutableDictionary = self.tableData[indexPath.row] as NSMutableDictionary
cell.textLabel?.text = redditEntry["data"]!["title"] as? String
cell.detailTextLabel?.text = redditEntry["data"]!["author"] as? String
return cell
}
// action to be taken when a cell is selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let redditEntry : NSMutableDictionary = self.tableData[indexPath.row] as NSMutableDictionary
self.selectedCellURL = redditEntry["data"]!["url"] as? String
self.performSegueWithIdentifier("passInfo" , sender: indexPath)
println(self.selectedCellURL!)
if delegate != nil {
let information:String = self.selectedCellURL!
println("ciao")
delegate?.userDidEnterInfo(WhichInfo: information)
self.navigationController?.popViewControllerAnimated(true)
}
second view
import UIKit
class WebPageController : UIViewController, sendInfoDelegate {
var infoFromSVC: String?
#IBOutlet weak var labelVC: UILabel!
func userDidEnterInfo(WhichInfo info: String) {
self.infoFromSVC = info
labelVC.text = infoFromSVC
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "passInfo"{
let firstVController : ViewController = segue.destinationViewController as ViewController
firstVController.delegate = self
}
}
}
Thanks.

Answer 1

To pass any data to second view controller you need to implement prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) method in your first view controller and here pass any data to your second view controller through segue.destinationViewController object.
for example
// this method must be in first view controller
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "passInfo" {
var secondViewController : SecondViewController = segue.destinationViewController as SecondViewController
var indexPath = self.tableview.indexPathForSelectedRow() //get index of data for selected row
secondViewController.data = self.dataArray.objectAtIndex(indexPath.row) // get data by index and pass it to second view controller
}
}
The code for getting data in second view controller
override func viewDidLoad() {
super.viewDidLoad()
self.label.text = self.data
}
The data variable must be defined as a property of your second view controller.