Working with CollectionView and CollectionViewCell

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It's the first time i'm working with UICollectionView and UICollectionViewCells. I am trying to make a simple view. The problems i' facing are: reloading collection view data, displaying text (from array) into cell labels.. code is here.. please help as much as you can.. <3 (app crashes when i don't add subview)

  #import "MainCollectionViewController.h"
#import "MainCollectionViewCell.h"

@interface MainCollectionViewController () <UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout>

{
    UICollectionView *colView;
}
@end

@implementation MainCollectionViewController

static NSString * const reuseIdentifier = @"Cell";

- (void)viewDidLoad {
    [super viewDidLoad];

 //  [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];

    self.actressArray = [NSMutableArray arrayWithObjects:@"John", @"Patrick", @"Jack", @"Clara", @"Nicol", @"Amanda", @"Nick", @"Bob", @"Jeff", @"Jerremy", @"Gloria", @"Bred", @"Seth", @"Peter", @"Lous", nil];

    self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
    colView=[[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout];
    [colView setDataSource:self]; //დელეგატების კოდით ჩართვა
    [colView setDelegate:self];

    [colView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];
    [colView setBackgroundColor:[UIColor grayColor]]; //ვიუს ბექგრაუნდის ფერი

    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
    [self.collectionView setCollectionViewLayout:flowLayout];

    [self.view addSubview:colView]; //ვიუზე ჩვენ მიერ გამზადებული ვიუს დაგდება

    [self.collectionView registerClass:[MainCollectionViewCell class] forCellWithReuseIdentifier: reuseIdentifier];

    ////[self.collectionView reloadData];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//// In a storyboard-based application, you will often want to do a little preparation before navigation
//- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender //{
//}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {

    return _actressArray.count;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

    return 3;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    MainCollectionViewCell *cell = (MainCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];

    NSString *actressStr = [_actressArray objectAtIndex:indexPath.row];
    cell.actressLabel.text = actressStr;

    //[self.collectionView reloadData];

    //[cell.contentView addSubview:  ];

    return cell;
}


1 Please Check You Outlets Connection Once again :-

2 And What's Error ???