UICollectionView overlapping cells - ios

Question

I am having a UICollectionView that I create and add programatically but for some reason at runtime section 1 and section 2 are overlapping, they both start in the same place:
Here is my Implementation (the code is swift 2.3 since this is a project requirement):
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = lightGreyColor
layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 15, right: 0)
layout.minimumInteritemSpacing = 0.5
layout.minimumLineSpacing = 0.5
layout.scrollDirection = UICollectionViewScrollDirection.Vertical
// layout.headerReferenceSize = CGSize(width: view.bounds.width, height: 30)
let collectionViewFrame = CGRect(x: 0, y: 0, width: view.bounds.width, height: viewHeight)
collectionView = UICollectionView(frame: collectionViewFrame, collectionViewLayout: layout)
collectionView.allowsSelection = true
collectionView.bounces = true
collectionView.scrollEnabled = true
collectionView.hidden = false
collectionView.pagingEnabled = false
collectionView.backgroundColor = lightGreyColor
collectionView.showsVerticalScrollIndicator = false
collectionView.showsHorizontalScrollIndicator = false
collectionView.delegate = self
collectionView.dataSource = self
view.addSubview(collectionView)
collectionView.registerNib(UINib(nibName: "SmallDiscoverItemCollectionViewCell", bundle: NSBundle.mainBundle()), forCellWithReuseIdentifier: "SmallDiscoverItemCollectionViewCell")
collectionView.registerClass(NewDiscoverTopCollectionViewCell.self, forCellWithReuseIdentifier: "NewDiscoverTopCollectionViewCell")
collectionView.registerClass(TopHeaderCell.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "TopHeaderCell")
greedoCollectionViewLayout = nil
greedoCollectionViewLayout1().rowMaximumHeight = collectionView.bounds.width/1.8
greedoCollectionViewLayout1().fixedHeight = false
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
switch indexPath.section {
case 0:
return CGSize(width: collectionView.bounds.width, height: 200)
case 1:
return CGSize(width: collectionView.bounds.width, height: 200)
default:
return self.greedoCollectionViewLayout1().sizeForPhotoAtIndexPath(indexPath)
}
}
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
switch (indexPath.section) {
case 0: let cell = collectionView.dequeueReusableCellWithReuseIdentifier("NewDiscoverTopCollectionViewCell", forIndexPath: indexPath) as! NewDiscoverTopCollectionViewCell
return cell
case 1: let cell = collectionView.dequeueReusableCellWithReuseIdentifier("NewDiscoverTopCollectionViewCell", forIndexPath: indexPath) as! NewDiscoverTopCollectionViewCell
return cell
case 2: let cell = collectionView.dequeueReusableCellWithReuseIdentifier("SmallDiscoverItemCollectionViewCell", forIndexPath: indexPath) as! SmallDiscoverItemCollectionViewCell
let item = usersItems[indexPath.item]
return cell
}
This is the end result of the overlap: Section 0 and 1 and having green background while in between there is this gap. While section 2 has lots of images:

Answer 1

For some weird reason the UICollectionViewCell got initialise to a y position equal to its size. To fix that I have just added this in the UICollectionViewCell
override init(frame: CGRect) {
let noProblemFrame = CGRect(x: 0, y: 0, width: frame.width, height: frame.height)
super.init(frame: noProblemFrame)