Not able to display values in another viewcontroller from TableView in Swift - ios

Question

I want to display the details of one one table row onto another viewController. But it shows an error saying ' fatal error: unexpectedly found nil while unwrapping an Optional value'
The code for my VC is as follows:
import UIKit
class ViewController: UIViewController, UITextFieldDelegate, UITableViewDelegate,UITableViewDataSource, UICollectionViewDataSource, UICollectionViewDelegate {
#IBOutlet var nameForUser: UITextField!
#IBOutlet var loginButton: UIButton!
#IBOutlet var tableView: UITableView!
let allEvents = Events.allEvents
var nextScreenRow: Events!
override func viewDidLoad() {
super.viewDidLoad()
//nameForUser.text! = "Please Enter Name Here"
// Do any additional setup after loading the view, typically from a nib.
}
func textFieldDidBeginEditing(textField: UITextField) {
textField.text = ""
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.allEvents.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("eventsCell")!
let event = self.allEvents[indexPath.row]
cell.textLabel?.text = event.eventName
cell.imageView?.image = UIImage(named: event.imageName)
cell.detailTextLabel?.text = event.entryType
//cell.textLabel?.text = allEvents[indexPath.row]
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
nextScreenRow = allEvents[indexPath.row]
performSegueWithIdentifier("tryToConnect", sender:self)
}
func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.allEvents.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let sec = collectionView.dequeueReusableCellWithReuseIdentifier("eventsSec", forIndexPath: indexPath) as! GridCollectionViewCell
let event = self.allEvents[indexPath.row]
sec.imageView.image = UIImage(named: event.imageName)
sec.caption.text = event.entryType
return sec
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
performSegueWithIdentifier("tryToConnect2", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "successfulLogin"){
segue.destinationViewController as! TabController
//let userName = nameForUser.text
//controller.userName = userName
}
else if (segue.identifier == "tryToConnect"){
let dest = segue.destinationViewController as! DetailedEventViewController
dest.deatiledEvent.text = nextScreenRow.eventName
dest.eventType.text = nextScreenRow.entryType
dest.imageView.image = UIImage(named: nextScreenRow.imageName)
}
}
#IBAction func loginButtonWhenPressed(sender: UIButton) {
let userName = nameForUser.text
if userName == "" {
let nextController = UIAlertController()
nextController.title = "Error!"
nextController.message = "Please enter a name"
let okAction = UIAlertAction(title: "okay", style: UIAlertActionStyle.Default) {
action in self.dismissViewControllerAnimated(true, completion: nil)
}
nextController.addAction(okAction)
self.presentViewController(nextController, animated: true, completion: nil)
}
}
}
When I run this, it shows the error. I have also assigned the delegates for the table view. The code for 'DetailedEventVC' is:
import UIKit
class DetailedEventViewController: UIViewController {
#IBOutlet weak var imageView: UIImageView!
#IBOutlet weak var deatiledEvent: UILabel!
#IBOutlet weak var eventType: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
Why does it show that the values are nil?
Help would be greatly appreciated.
Thanks in advance.
The 'EventsDetails.swift' file which has the details of events are a structure. Is there anything wrong in the way I'm calling the values?
import Foundation
import UIKit
struct Events {
let eventName: String
let entryType: String
let imageName: String
static let EventKey = "NameKey"
static let EntryTypeKey = "EntryType"
static let ImageNameKey = "ImageNameKey"
init(dictionary:[String : String]) {
self.eventName = dictionary[Events.EventKey]!
self.entryType = dictionary[Events.EntryTypeKey]!
self.imageName = dictionary[Events.ImageNameKey]!
}
}
extension Events {
static var allEvents: [Events] {
var eventsArray = [Events]()
for d in Events.localEventsData(){
eventsArray.append(Events(dictionary: d))
}
return eventsArray
}
static func localEventsData()-> [[String: String]] {
return [
[Events.EventKey:"Metallica Concert in Palace Grounds", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"Metallica"],
[Events.EventKey:"Saree Exhibition in Malleswaram Grounds", Events.EntryTypeKey: "Free Entry", Events.ImageNameKey:"SareeExhibition"],
[Events.EventKey:"Wine tasting event in Links Brewery", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"WineTasting"],
[Events.EventKey:"Startups Meet in Kanteerava Stadium", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"StartupMeet"],
[Events.EventKey:"Summer Noon Party in Kumara Park", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"SummerNoonParty"],
[Events.EventKey:"Rock and Roll nights in Sarjapur Road", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"RockNRollNight"],
[Events.EventKey:"Barbecue Fridays in Whitefield", Events.EntryTypeKey: "Paid Entry", Events.ImageNameKey:"BBQFriday"],
[Events.EventKey:"Summer workshop in Indiranagar", Events.EntryTypeKey: "Free Entry", Events.ImageNameKey:"SummerWorkshop"],
[Events.EventKey:"Impressions & Expressions in MG Road", Events.EntryTypeKey: "Free Entry", Events.ImageNameKey:"ImpressionAndExpression"],
[Events.EventKey:"Italian carnival in Electronic City", Events.EntryTypeKey: "Free Entry", Events.ImageNameKey:"ItalianCarnival"]
]
}
}

Answer 1

Create properties in your destination viewController and use them like below
import UIKit
class DetailedEventViewController: UIViewController {
#IBOutlet weak var imageView: UIImageView!
#IBOutlet weak var deatiledEvent: UILabel!
#IBOutlet weak var eventType: UILabel!
var myImage = UIImage?
var eventDetails = ""
var typeOfEvent = ""
override func viewDidLoad() {
super.viewDidLoad()
imageView.image = myImage
deatiledEvent.text = eventDetails
eventType.text = typeOfEvent
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
and then in your first viewController you can access them like
let dest = segue.destinationViewController as! DetailedEventViewController
dest.eventDetails = nextScreenRow.eventName
dest.typeOfEvent = nextScreenRow.entryType
dest.myImage = UIImage(named: nextScreenRow.imageName)