Segue Error in detail view controller

Question

I have created the model class and with some static images and text I have populated the UICollectionView, but when the user touches the cell it shows an error in view controller 2 when I print or show it on a label. Below is the code.

Any suggestion?!

This is the model class

import Foundation

class Pokemon {
    private var  _name: String!
    private var _pokedexId: Int!

    // Setter And Getter
    var name : String {
        return _name
    }

    var pokedexId: Int {
        return _pokedexId
    }

    // Initializer to initialize the data
    init(name : String, pokedexId: Int) {
        self._name = name
        self._pokedexId = pokedexId
    }
}

This is segue func in viewcontroller 1

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "pokeSegue" {
    if let detailVC = segue.destinationViewController as? ViewController2 {
        if let poke = sender as? Pokemon {
            detailVC.pokemon = poke
        }
    }
}

UICollectionView delegate

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    let poke: Pokemon!
    if inSearchMode {
        poke = filteredPokemon[indexPath.row]
    } else  {
        poke = pokemon[indexPath.row]
    }
    print(poke.name)
    performSegueWithIdentifier("pokeSegue", sender: self)
}

In viewController2

import UIKit
class ViewController2: UIViewController {

    var pokemon: Pokemon!
    var receviceingString : String!

    @IBOutlet weak var label: UILabel!

    override func viewDidLoad() {

      print(pokemon.name) //unexpectedly found nil while unwrapping an Optional value
    }

} 

Answer 1

EDIT

Use poke as the sender instead of self when calling performSegueWithIdentifier :

performSegueWithIdentifier("pokeSegue", sender: poke)

ORIGINAL ANSWER

I assume that you are using an UICollectionViewCell to trigger the segue.

If so, the let poke = sender as? Pokemon let poke = sender as? Pokemon will always returns false and be skipped because the sender will be the UICollectionViewCell that triggered the segue and not an instance of Pokemon .

You can either create a new type of UICollectionViewCell that can store a Pokemon object or simply use the tag property of the cells to store the index of the referenced Pokemon.

This value is configurable from the collectionView(_ collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) method.

Then in the prepareForSegue method you have to cast the sender object to the relevant UICollectionView type and retrieve the Pokemon with the information you defined.