Embedded UICollectionView in View Controller not getting called Swift - ios

Question

For some strange reason the collectionView isn't called. I put break points at numberOfItemsInSection and cellForItemAtIndexPath but they are never called. Here is my code:
class ChannelViewController: UIViewController, UISearchResultsUpdating, UICollectionViewDataSource, UICollectionViewDelegate {
var channelArray: [ChannelInfo] = []
var filteredSearchResults = [ChannelInfo]()
var resultsSearchController = UISearchController(searchResultsController: nil)
var logosShown = [Bool](count: 50, repeatedValue: false)
var detailUrl: String?
var apiKey = ""
var channel: String!
var channelForShow: String!
var task: NSURLSessionTask?
#IBOutlet var channelCollectionView: UICollectionView!
override func viewDidLoad() {
let baseURL = ""
getJSON(baseURL)
}
//MARK: CollectionView
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if resultsSearchController.active && resultsSearchController.searchBar.text != ""
{
return filteredSearchResults.count
} else {
return channelArray.count
}
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("ChannelCell", forIndexPath: indexPath) as! ChannelCell
let channel: String
if resultsSearchController.active && resultsSearchController.searchBar.text != "" {
channel = self.filteredSearchResults[indexPath.row].logo
} else {
channel = self.channelArray[indexPath.row].logo
}
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
var replacedTitle: String?
if resultsSearchController.active && resultsSearchController.searchBar.text != "" {
channelForShow = filteredSearchResults[indexPath.row].channelName
}
} else {
channelForShow = self.channelArray[indexPath.row].channelName
}
}
self.dismissSearchBar()
performSegueWithIdentifier("channelCollectToShowSegue", sender: self)
}
}
I also have a cell subclassed for the collectionView Cell:
class ChannelCell : UICollectionViewCell {
#IBOutlet var channelImageView: UIImageView!
}

Answer 1

You need to set the datasource of collection view to the controller.
1) In Interface builder, just drag from the collection view to the controller. and choose both the delegate and datasource..
2) Programatically
override func viewDidLoad() {
super.viewDidLoad()
channelCollectionView.delegate = self
channelCollectionView.dataSource = self
let baseURL = ""
getJSON(baseURL)
}

Answer 2

Did you set the collectionView's delegate and dataSource properties? If not, change your viewDidLoad to this, in order to set those two properties programmatically:
override func viewDidLoad() {
channelCollectionView.delegate = self
channelCollectionView.dataSource = self
let baseURL = ""
getJSON(baseURL)
}
If you don't set the delegate and dataSource, the collectionView won't know where to look to call the appropriate methods, such as cellForItemAtIndexPath. Hopefully this fixes your problem.