UICollectionView in UINavgationController - uinavigationcontroller

Question

I want to do a simple example.
I have a rootViewController that is a UINavgationController, and there is a UIViewController in that UINavgationController. Now I want to create UICollectionView in the UIViewController, but I am getting an error.
here is the code:
#import "AppDelegate.h"
#import "XJViewController.h"
#interface AppDelegate ()
#end
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
XJViewController *xjv = [[XJViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:xjv];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;
}
#import <UIKit/UIKit.h>
#interface XJViewController : UIViewController<UICollectionViewDelegate,UICollectionViewDataSource>
#end
#import "XJViewController.h"
#interface XJViewController ()
#end
#implementation XJViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor whiteColor];
self.title = #"XJ";
self.navigationController.navigationBar.barTintColor = [UIColor redColor];
NSDictionary *dicColor = #{NSForegroundColorAttributeName : [UIColor whiteColor]};
self.navigationController.navigationBar.titleTextAttributes = dicColor;
UICollectionViewFlowLayout *fLayout = [[UICollectionViewFlowLayout alloc]init];
UICollectionView *cv = [[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:fLayout];
[cv registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"myeCell"];
cv.dataSource = self;
cv.delegate = self;
[self.view addSubview:cv];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 4;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"myCell" forIndexPath:indexPath];
cell.backgroundColor = [UIColor redColor];
return cell;
}
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view
of kind: UICollectionElementKindCell with identifier myCell - must
register a nib or a class for the identifier or connect a prototype
cell in a storyboard'
Please help me figure out what the problem is.

Answer 1

[cv registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"myeCell"];
The identifier here is different from the one you are using in -cellForItemAtIndexPath