title: UICollectionView Cells Not Showing
body: <p>I've got this bit of code, and I can't get the cells to show up. I've tried setting a background colour to see if they were showing up and it was just the images within them that weren't appearing, but it seems that the cells aren't showing up at all. </p>
  
  <p>Edit: This is the full code, with everything from other elements as well (Most things are commented out)</p>
  
  <pre><code>import UIKit
  import CoreData
  
  //Things in the collection cell
  class AvatarCollectiveCell: UICollectionViewCell {
  @IBOutlet weak var AvatarImage: UIImageView!
  
  }
  
  class Avatar: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
  
  // Collection View Within View Controller
  @IBOutlet weak var CollectionView: UICollectionView!
  
  // Avatar Images
  
  var AvatarImages = ["Avacado", "Bear", "Cow", "Carrot", "Dolphin", "Dinosaur", "Elephant", "Flamingo", "Fox", "Hippo", "Jellyfish", "Moose", "Monkey", "Octopus", "Pig", "Panda", "Parrot", "Pumpkin", "Popcorn", "Penguin", "Platypus", "Sheep", "Sloth", "Shark", "Wolf"]
  //AvatarCollectionView.reloaddata()
  //
  // CollectionView.dataSource = self
  //CollectionView.delegate = self
  //UICollectionView.reloadData()
  // CollectionView.reloadData()
  
  // Create Cells
  func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -&gt; Int {
      return AvatarImages.count //Number of Images
  }
  
  
  // make a cell for each cell index path
  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -&gt; UICollectionViewCell {
  
      // get a reference to our storyboard cell
      let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "AvatarCell", for: indexPath as IndexPath) as! AvatarCollectiveCell
      let Avatars = AvatarImages[indexPath.item]
  
  
  
  
      // Use the outlet in our custom class to get a reference to the UILabel in the cell
      //cell.BookCover.image = UIImage(named: arrayBookImages[indexPath.item])
      cell.AvatarImage.image = UIImage(named: AvatarImages[indexPath.item-1])
      cell.backgroundColor = UIColor.white // make cell more visible in our example project
  
      return cell
  }
  
  
  override func viewWillAppear(_ animated: Bool) {
      super.viewWillAppear(animated)
  
      // USERNAME DISPLAY BEGINS
      /*
       //reload the data for the collection view
       //NameDisplay.reloadData()
  
       guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
       return
       }
  
       //getting the managed context where the entity we need is
       let managedContext = appDelegate.persistentContainer.viewContext
  
       //make fetch request
       let fetchRequest = NSFetchRequest&lt;NSManagedObject&gt;(entityName: "UserInfo", attributeName: "name")
  
  
       //try to fetch the entity we need, else print error
       do {
       Username = try managedContext.fetch(fetchRequest)
       } catch let error as NSError {
       print("Could not fetch. \(error), \(error.userInfo)")
       }*/
      //USERNAME DISPLAY ENDS
  
  
  }
  
  
  override func viewDidLoad() {
      //  CollectionView.dataSource = self
      //   CollectionView.delegate = self
      //super.viewDidLoad()
      // Avatar.collectionView?.register(AvatarCollectiveCell.self, forCellWithReuseIdentifier: ObjectIdentifier)
  
      // Do any additional setup after loading the view.
  }
  
  override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
  }
  
  var Username:String = ""
  @IBOutlet weak var NameDisplay: UILabel!
  /*
   // MARK: - Navigation
  
   // In a storyboard-based application, you will often want to do a little preparation before navigation
   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
   // Get the new view controller using segue.destinationViewController.
   // Pass the selected object to the new view controller.
   }
   */
  </code></pre>
  
  <p>}</p>
  
  <p><strong>* Note: Errors were fixed by changing the module of the view controller*</strong></p>
  
  <p>Error it crashes with:</p>
  
  <p>2017-05-14 23:27:49.905819 FInal Project[25556:734502] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /Users/student/Library/Developer/CoreSimulator/Devices/265EA47F-07A6-47C7-A6B4-5E62D37E72BA/data/Containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
  2017-05-14 23:27:49.990769 FInal Project[25556:734502] [MC] Reading from private effective user settings.
  2017-05-14 23:27:55.065654 FInal Project[25556:734502] [Common] _BSMachError: port 7103; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
  2017-05-14 23:27:55.066446 FInal Project[25556:734502] [Common] _BSMachError: port 7103; (os/kern) invalid name (0xf) "Unable to deallocate send right"
  12345abcde
  in 
  Out 
  2017-05-14 23:29:01.246 FInal Project[25556:734502] Unknown class AvatarCollectiveCell in Interface Builder file.
  2017-05-14 23:29:01.824 FInal Project[25556:734502] <strong>* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key AvatarImage.'
  *</strong> First throw call stack:
  (
      0   CoreFoundation                      0x0000000104948d4b <strong>exceptionPreprocess + 171
      1   libobjc.A.dylib                     0x0000000103f8921e objc_exception_throw + 48
      2   CoreFoundation                      0x0000000104948c99 -[NSException raise] + 9
      3   Foundation                          0x0000000103a979df -[NSObject(NSKeyValueCoding) setValue:forKey:] + 291
      4   UIKit                               0x0000000105544375 -[UIView(CALayerDelegate) setValue:forKey:] + 173
      5   UIKit                               0x000000010588e79e -[UIRuntimeOutletConnection connect] + 109
      6   CoreFoundation                      0x00000001048ed9e0 -[NSArray makeObjectsPerformSelector:] + 256
      7   UIKit                               0x000000010588d122 -[UINib instantiateWithOwner:options:] + 1867
      8   UIKit                               0x0000000105dd2012 -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1094
      9   UIKit                               0x0000000105dd28ea -[UICollectionView dequeueReusableCellWithReuseIdentifier:forIndexPath:] + 169
      10  FInal Project                       0x00000001039509fb _TFC13FInal_Project6Avatar14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 171
      11  FInal Project                       0x0000000103950db7 _TToFC13FInal_Project6Avatar14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 87
      12  UIKit                               0x0000000105dbd75f -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 467
      13  UIKit                               0x0000000105dbd586 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 35
      14  UIKit                               0x0000000105dc2a5e -[UICollectionView _updateVisibleCellsNow:] + 4803
      15  UIKit                               0x0000000105dc8725 -[UICollectionView layoutSubviews] + 313
      16  UIKit                               0x0000000105544ab8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
      17  QuartzCore                          0x000000010ae3fbf8 -[CALayer layoutSublayers] + 146
      18  QuartzCore                          0x000000010ae33440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
      19  QuartzCore                          0x000000010ae332be _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
      20  QuartzCore                          0x000000010adc1318 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
      21  QuartzCore                          0x000000010adee3ff _ZN2CA11Transaction6commitEv + 475
      22  UIKit                               0x00000001054aa7f0 _afterCACommitHandler + 346
      23  CoreFoundation                      0x00000001048ed267 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION</strong> + 23
      24  CoreFoundation                      0x00000001048ed1d7 __CFRunLoopDoObservers + 391
      25  CoreFoundation                      0x00000001048d1f8e __CFRunLoopRun + 1198
      26  CoreFoundation                      0x00000001048d1884 CFRunLoopRunSpecific + 420
      27  GraphicsServices                    0x000000010a64ca6f GSEventRunModal + 161
      28  UIKit                               0x000000010547fc68 UIApplicationMain + 159
      29  FInal Project                       0x00000001039495bf main + 111
      30  libdyld.dylib                       0x000000010877268d start + 1
      31  ???                                 0x0000000000000001 0x0 + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  (lldb) </p>
  
  <p>Edits;</p>
  
  <p>2017-05-15 06:24:55.693709 FInal Project[32230:909344] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /Users/student/Library/Developer/CoreSimulator/Devices/265EA47F-07A6-47C7-A6B4-5E62D37E72BA/data/Containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles
  2017-05-15 06:24:55.694415 FInal Project[32230:909344] [MC] Reading from private effective user settings.
  2017-05-15 06:25:01.292524 FInal Project[32230:909344] [Common] _BSMachError: port 7403; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
  2017-05-15 06:25:01.293292 FInal Project[32230:909344] [Common] _BSMachError: port 7403; (os/kern) invalid name (0xf) "Unable to deallocate send right"
  12345abcde
  in 
  Out 
  2017-05-15 06:25:11.059 FInal Project[32230:909344] Unknown class AvatarCollectiveCell in Interface Builder file.
  2017-05-15 06:25:11.595 FInal Project[32230:909344] <strong>* Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key AvatarImage.'
  *</strong> First throw call stack:
  (
      0   CoreFoundation                      0x0000000103c26d4b <strong>exceptionPreprocess + 171
      1   libobjc.A.dylib                     0x000000010326721e objc_exception_throw + 48
      2   CoreFoundation                      0x0000000103c26c99 -[NSException raise] + 9
      3   Foundation                          0x0000000102d759df -[NSObject(NSKeyValueCoding) setValue:forKey:] + 291
      4   UIKit                               0x0000000104822375 -[UIView(CALayerDelegate) setValue:forKey:] + 173
      5   UIKit                               0x0000000104b6c79e -[UIRuntimeOutletConnection connect] + 109
      6   CoreFoundation                      0x0000000103bcb9e0 -[NSArray makeObjectsPerformSelector:] + 256
      7   UIKit                               0x0000000104b6b122 -[UINib instantiateWithOwner:options:] + 1867
      8   UIKit                               0x00000001050b0012 -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1094
      9   UIKit                               0x00000001050b08ea -[UICollectionView dequeueReusableCellWithReuseIdentifier:forIndexPath:] + 169
      10  FInal Project                       0x0000000102c2eafb _TFC13FInal_Project6Avatar14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 171
      11  FInal Project                       0x0000000102c2eeb7 _TToFC13FInal_Project6Avatar14collectionViewfTCSo16UICollectionView13cellForItemAtV10Foundation9IndexPath_CSo20UICollectionViewCell + 87
      12  UIKit                               0x000000010509b75f -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:isFocused:notify:] + 467
      13  UIKit                               0x000000010509b586 -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 35
      14  UIKit                               0x00000001050a0a5e -[UICollectionView _updateVisibleCellsNow:] + 4803
      15  UIKit                               0x00000001050a6725 -[UICollectionView layoutSubviews] + 313
      16  UIKit                               0x0000000104822ab8 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1237
      17  QuartzCore                          0x000000010a1abbf8 -[CALayer layoutSublayers] + 146
      18  QuartzCore                          0x000000010a19f440 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366
      19  QuartzCore                          0x000000010a19f2be _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
      20  QuartzCore                          0x000000010a12d318 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 280
      21  QuartzCore                          0x000000010a15a3ff _ZN2CA11Transaction6commitEv + 475
      22  UIKit                               0x00000001047887f0 _afterCACommitHandler + 346
      23  CoreFoundation                      0x0000000103bcb267 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION</strong> + 23
      24  CoreFoundation                      0x0000000103bcb1d7 __CFRunLoopDoObservers + 391
      25  CoreFoundation                      0x0000000103baff8e __CFRunLoopRun + 1198
      26  CoreFoundation                      0x0000000103baf884 CFRunLoopRunSpecific + 420
      27  GraphicsServices                    0x00000001099b8a6f GSEventRunModal + 161
      28  UIKit                               0x000000010475dc68 UIApplicationMain + 159
      29  FInal Project                       0x0000000102c276bf main + 111
      30  libdyld.dylib                       0x0000000107a5068d start + 1
      31  ???                                 0x0000000000000001 0x0 + 1
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  (lldb) </p>