Passing data back to previous view controller after selecting table view cell - ios

Question

I'm having trouble passing data after selecting a table view cell to the previous view controller. I'm pretty much trying to change a label from the previous view controller after selecting a table view cell. Could anyone help me go about this? I'm trying to change the UITextField after selecting a cell.
UIViewController:
class WhoToOdds: UIViewController, sendBack,UITextFieldDelegate{
#IBOutlet var chosenContact: UITextField!
#IBOutlet var oddsTextBox: UITextView!
var friend: String?
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(false, animated: true)
}
func sendNameToPreviousVC(selectedfriendName: String) {
friend = selectedfriendName
chosenContact.text = friend
}
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 == "friendList"{
let friendViewController = (segue.destinationViewController as! friendListController)
var fbRequest = FBSDKGraphRequest(graphPath:"/me/friends", parameters: nil);
fbRequest.startWithCompletionHandler { (connection : FBSDKGraphRequestConnection!, result : AnyObject!, error : NSError!) -> Void in
if error == nil {
println("Friends are : \(result)")
PFUser.currentUser()?["friend_list"] = result
PFUser.currentUser()?.save()
print(result)
var resultdict = result as! NSDictionary
println("Result Dict: \(resultdict)")
friendViewController.friendArray = resultdict.objectForKey("data") as! NSArray
} }
}
}
#IBAction private func submitChallenge(sender: AnyObject) {
navigationController?.popViewControllerAnimated(true)
}
}
TableViewController:
protocol sendBack
{
func sendNameToPreviousVC(contact: String)
}
class friendListController: UITableViewController, UITableViewDataSource, UITableViewDelegate{
var friendArray:NSArray = ["a","b","c"]
var valueDict:NSDictionary = [:]
var mDelegate:sendBack?
var selectedFriend :String?
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
navigationController?.setNavigationBarHidden(false, animated: true)
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return friendArray.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("friend", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = (friendArray[indexPath.row] as! String)
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
let indexPath = tableView.indexPathForSelectedRow();
let currentCell = tableView.cellForRowAtIndexPath(indexPath!) as UITableViewCell!
selectedFriend = currentCell.textLabel!.text as String!
sendBackFriendList(selectedFriend!)
navigationController?.popViewControllerAnimated(true)
}
func sendBackFriendList(name: String){
self.mDelegate?.sendNameToPreviousVC(name)
}
}

Answer 1

Your delegate needs to be set. In your case you have to set it inside prepareForSegue method like
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "friendList"{
let friendViewController = (segue.destinationViewController as! friendListController)
friendViewController.mDelegate = self //Include this line
//rest of the code
}
}

Answer 2

You didn't set the delegate in your segue, so mDelegate is nil in your sendBackFriendList method