UICollectionView单元格中的UIImageView不显示

Question

I'm very new to iOS development, sorry for posting such a basic mistake, I just can't get my head around this.

I will tell you what I have done so far, hopefully someone can help me out here. I have not edited any code so far.

1. Add collection view controller (click and drag into main.storyboard)
2. Configure cell sizes in the attributes editor of the CollectionView
3. Drag UIImageView object onto each cell
4. Import my images into the project (drag images into sidebar and import)
5. Select each UIImageView and in attributes select the correct image

Having done this, my images display perfectly in the storyboard editor but when I run the app in the simulator it is just a blank screen with my specified background colour.

Screenshot of editor , Screenshot of simulator

Answer 1

You should add the data source method after creating a collection view controller class,

// Defines the number of cells in a section of collection view
- (NSInteger)collectionView:(UICollectionView *)cv numberOfItemsInSection:(NSInteger)section;
{
    return numberOfItems;
}

// Defines the cells in the collection view
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
{
// Gallerycell is the custom collection view cell class holds the UIImage View
    GalleryCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"GalleryCell" forIndexPath:indexPath];
// getting the image 
    cell.cellImage.image = [UIImage imageNamed:[dataSourceArray objectAtIndex:indexPath.row]];
    return cell;
}

Answer 2

You should implement datasource methods for displaying a cell. Doesn't meter if it's static or dynamic cells.