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I can connect the delegate, however, when connecting the data source I am getting the following error:

2015-07-13 16:45:17.529 paintApp[4628:168318] -[UIView collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x7f8a12651c60 2015-07-13 16:45:17.539 paintApp[4628:168318] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x7f8a12651c60' * First throw call stack: ( 0 CoreFoundation 0x0000000107f67b75 exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000109cf7bb7 objc_exception_throw + 45 2 CoreFoundation 0x0000000107f6ec8d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x0000000107ec66fc ___forwarding_ + 988 4 CoreFoundation 0x0000000107ec6298 _CF_forwarding_prep_0 + 120 5 UIKit 0x00000001090a5286 -[UICollectionViewData _updateItemCounts] + 296 6 UIKit 0x00000001090a7469 -[UICollectionViewData numberOfSections] + 22 7 UIKit 0x000000010909158e -[UICollectionViewFlowLayout _getSizingInfos] + 348 8 UIKit 0x0000000109092689 -[UICollectionViewFlowLayout _fetchItemsInfoForRect:] + 526 9 UIKit 0x000000010908deff -[UICollectionViewFlowLayout prepareLayout] + 257 10 UIKit 0x00000001090a53f0 -[UICollectionViewData _prepareToLoadData] + 67 11 UIKit 0x00000001090a5ac9 -[UICollectionViewData validateLayoutInRect:] + 54 12 UIKit 0x000000010906e198 -[UICollectionView layoutSubviews] + 170 13 UIKit 0x0000000108ab3303 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521 14 QuartzCore 0x000000010d463de8 -[CALayer layoutSublayers] + 150 15 QuartzCore 0x000000010d458a0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380 16 QuartzCore 0x000000010d45887e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 17 QuartzCore 0x000000010d3c663e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242 18 QuartzCore 0x000000010d3c774a _ZN2CA11Transaction6commitEv + 390 19 UIKit 0x0000000108a3795d -[UIApplication _reportMainSceneUpdateFinished:] + 44 20 UIKit 0x0000000108a3866a -[UIApplication _runWithMainScene:transitionContext:completion:] + 2684 21 UIKit 0x0000000108a37005 -[UIApplication workspaceDidEndTransaction:] + 179 22 FrontBoardServices 0x000000010c58d253 31-[FBSSerialQueue performAsync:]_block_invoke + 16 23 CoreFoundation 0x0000000107e9c9bc __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK + 12 24 CoreFoundation 0x0000000107e92705 __CFRunLoopDoBlocks + 341 25 CoreFoundation 0x0000000107e924c5 __CFRunLoopRun + 2389 26 CoreFoundation 0x0000000107e91906 CFRunLoopRunSpecific + 470 27 UIKit 0x0000000108a36a72 -[UIApplication _run] + 413 28 UIKit 0x0000000108a39870 UIApplicationMain + 1282 29 paintApp 0x0000000107d7272e top_level_code + 78 30 paintApp 0x0000000107d7276a main + 42 31 libdyld.dylib 0x000000010a4d3145 start + 1 32 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

Here is my view controller class : 

import UIKit class ViewControllerGallery: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate { var tableData: [String] = ["img1" , "img2"] var tableImages: [String] = ["file1.png", "file2.png"] var collectionView: UICollectionView! override func viewDidLoad() { super.viewDidLoad() collectionView = UICollectionView(frame: self.view.frame) collectionView.dataSource = self collectionView.delegate = self collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell") self.view.addSubview(collectionView) // Do any additional setup after loading the view. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return tableData.count } func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { let cell : ColViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath : indexPath) as ColViewCell cell.labelCell.text = tableData[indexPath.row] cell.imgCell.image = UIImage(named : tableImages[indexPath.row]) return cell //UICollectionViewCell() } func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { println("Cell \(indexPath.row) selcted") } }

Here is my 'cell' class where have connected the cells image and label to:

import UIKit class ColViewCell: UICollectionViewCell { @IBOutlet var imgCell: UIImageView! @IBOutlet var labelCell: UILabel! }
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Your error is self-explanative enough. In place, where you set collectionView.dataSource you have an error source - instead of something implementing UICollectionViewDataSource you set UIView instance.

I think, you need something like

override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. collectionView.dataSource = self; }
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Thanks for your answer! I'm not sure I have set collectionView.dataSource anywhere? I have used the following to try correct :
var collectionView: UICollectionView! override func viewDidLoad() { super.viewDidLoad() collectionView = UICollectionView(frame: self.view.frame) collectionView.dataSource = self collectionView.delegate = self collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell") collectionView.backgroundColor = UIColor.whiteColor() self.view.addSubview(collectionView) // Do any additional setup after loading the view. }
Oh, I have changed it to what I think you mean? Thanks again
Yes, thats it. So, does it work now? Looks like it should
Are you using Interface Builder?
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