UICollectionView cell leaves huge gaps all settings set to 0 - ios

Question

Hi there i have a slight problem with my UICollectionView. i don't currently have any settings set for spacing yet i seem to have a huge gap between my cells of which is very annoying if would be helpful if someone could tell me how to resolve this? id assume its something very simple.
Below is an example of whats happening to my CollectionViewCells:
Custom cell.h
#import <UIKit/UIKit.h>
#interface CustomCell : UICollectionViewCell
#property (weak, nonatomic) IBOutlet UIImageView *IconImage;
#property (weak, nonatomic) IBOutlet UILabel *IconLabel;
#property (weak, nonatomic) IBOutlet UILabel *IconDescription;
#end
groupsviewcontroller.m
#import "GroupsViewController.h"
#import "CustomCell.h"
#interface GroupsViewController ()
{
NSArray *arrayOfImages;
NSArray *arrayOfDescriptions;
}
#end
#implementation GroupsViewController
{
NSString *reuseIdentifier;
}
- (void)viewDidLoad
{
[super viewDidLoad];
reuseIdentifier= #"SmallIcon";
[[self GroupsCollectionView]setDataSource:self];
[[self GroupsCollectionView]setDelegate:self];
arrayOfImages = [[NSArray alloc]initWithObjects:#"sin.png", nil];
arrayOfDescriptions = [[NSArray alloc]initWithObjects:#"Sin", nil];
}
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [arrayOfDescriptions count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
CustomCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
[[cell IconImage]setImage:[UIImage imageNamed:[arrayOfImages objectAtIndex:indexPath.item]]];
[[cell IconLabel]setText:[arrayOfDescriptions objectAtIndex:indexPath.item]];
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
//Dispose of any resources that can be recreated.
}
- (IBAction)cellToggleAction:(id)sender {
//need to add toggle button to toggle between three different views
//small icon
//list view
//large icon
}
#end

Answer 1

1) You should check your CustomCell class, see if any size constraint is applied. Simply set your cell's background as some color and the actual cell size will be highlighted.
2) Use (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath to help yourself set the proper cell size. This func comes with UICollectionViewDelegateFlowLayout :)