UICollectionView Appearing Blank - ios

Question

I am trying to use a UICollectionView but I am having a lot of issues. I have a UIViewController with a UICollectionView inside. I have setup all the delegates correctly along with the UILabel in the CVcell. The view appears and is white as defined in the code. The NSLog sends out all the cells and the text that should be there but in the actual UICollectionView it is blank and nothing appears apart from the scroll view. I have tried everything but cannot seem to get this working correctly. The cell is 187 x 187 taking up half the screen size with a label in the middle. I will post the code below.
Thanks
#import "StudentControllerMain.h"
#import "CVcell.h"
#interface StudentControllerMain ()
#property (nonatomic, strong) IBOutlet UICollectionView *collectionView;
#property (nonatomic, strong) NSArray *dataArray;
#end
#implementation StudentControllerMain
- (void)viewDidLoad {
[super viewDidLoad];
NSMutableArray *firstSection = [[NSMutableArray alloc] init];
for (int i=0; i<5; i++) {
[firstSection addObject:[NSString stringWithFormat:#"Cell %d", i]];
}
self.dataArray = [[NSArray alloc] initWithObjects:firstSection, nil];
[self.collectionView registerClass:[CVcell class] forCellWithReuseIdentifier:#"CVcell"];
// Configure layout
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
self.collectionView = nil;
self.dataArray = nil;
// Dispose of any resources that can be recreated.
}
-(UIStatusBarStyle)preferredStatusBarStyle{
return UIStatusBarStyleLightContent;
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return [self.dataArray count];
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
NSMutableArray *sectionArray = [self.dataArray objectAtIndex:section];
return [sectionArray count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
// Setup cell identifier
static NSString *cellIdentifier = #"CVcell";
CVcell *cell = (CVcell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
NSMutableArray *data = [self.dataArray objectAtIndex:indexPath.section];
NSString *cellData = [data objectAtIndex:indexPath.row];
NSLog(cellData);
[cell.title setText:cellData];
[cell.title setTextColor:[UIColor blackColor]];
return cell;
}
#end

Answer 1

remove the register class code;
setting the "identifier" attribute (in attribute inspector) of collection view cell in storyboard;

Answer 2

If you're sure cellForItemAtIndexPath is being called then the issue is the frame of all the views as they are laid out. Run the app and go to that page. Go to Debug -> View debugging -> Capture view hierarchy . This will show you all the views and their sizes. Do you see the table itself? Is it the correct height? Can you see each cell? Can you see their subviews? You can right click each one to print out their dimensions.