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UICollectionView displays only the first item from the dataset

There are two objects ( Department ↔> Employee ).

This department has 4 employees. When I pick up all the employees in this department, my journal window shows:

CoreData: annotation: total sampling time: 0.0017s for 4 rows.

things are good.

But it UICollectionViewdisplays only the first employee 4 times. For instance:

Employee1, Employee1, Employee1, Employee1

instead

Employee1, Employee2, Employee3, Employee4

I have some error in cellForItemAtIndexPath :

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"cellRecipe";    
    collectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];

    Employee *emp = [array_ objectAtIndex:indexPath.item];
    cell.name.text = emp.name;
    cell.image.image = emp.thumbImg;

    return cell;
}

array _ is NSMutableArray after retrieval

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1

, .

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return  noOfItem/ noOfSection;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return noOfSection;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
     static NSString *CellIdentifier = @"cellRecipe";    
     collectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
  ;

    Employee *emp = [array_ objectAtIndex:indexPath.section * noOfSection + indexPath.row];
    cell.name.text = emp.name;
    cell.image.image = emp.thumbImg;

    return cell;
}
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