uicollectionviewcell

I want to show images in a grid on iPhone using a UICollectionView, showing 3 images a row. For a "dead simple test" (as I thought), I've added 15 JPG images to my project, so that they'll be in my bundle and I can load them simply via [UIImage imageNamed:...]. I think I've done everything correct (setting up & registering UICollectionViewCell subclass, use of UICollectionViewDataSource Protocol methods), however, the UICollectionView behaves very weird: It shows only a few of the images in the following pattern: First line shows image 1 & 3, second line is blank, next line like the first

How can I enable/disable section headers in UICollectionView programmatically? It can be easily done easily done in Storyboard (checkbox), but how about doing it in code? spassas You can either use the collectionView:layout:referenceSizeForHeaderInSection: method of the UICollectionViewDelegateFlowLayout and return CGSizeMake(0,0) or set accordingly the headerReferenceSize of UICollectionViewFlowLayout . Edit: headerReferenceSize is actually the property that storyboard uses to show/hide the headers. I've added the relevant lines from the Storyboard file With section checkbox on :

I'm easily able to change the background color of a cell in the CellForItemAtIndexPath method func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { cell.backgroundColor = UIColor.blackColor() } However, when I attempt to change the color in the DidSelectItemAtIndexPath it does not work. func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { let cell: ButtonCollectionCell = collectionView.dequeueReusableCellWithReuseIdentifier("ButtonCell", forIndexPath: indexPath) as!

I would like to populate UICollectionView in reverse order so that the last item of the UICollectionView fills first and then the second last and so on. Actually I'm applying animation and items are showing up one by one. Therefore, I want the last item to show up first. I'm assuming you are using UICollectionViewFlawLayout, and this doesn't have logic to do that, it only works in a TOP-LEFT BOTTOM-RIGHT order. To do that you have to build your own layout, which you can do creating a new object that inherits from UICollectionViewLayout. It seems like a lot of work but is not really that much,

I am interested in having a collectionview as a part of a collection view cell but for some reason cannot figure out how this would be done. Where would I implement the necessary methods for the cells collectionview? There's an article that Ash Furrow wrote that explains how to put an UICollectionView inside an UITableViewCell . It's basically the same idea when using it inside an UICollectionViewCell . Everything is done programatically. No storyboards. I added a UICollectionView inside my UICollectionViewCell. I also show how to add again a UICollectionViewCell inside the created