class ThemesVC: UIViewController {
	
	var images: [UIImage] = []
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		images = ThemeManager().themeBackgroundImages()
		
		// whatever else you're doing in viewDidLoad
		// ...
	}
	
}

extension ThemesVC: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
	
	func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
		return images.count
	}
	
	func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
		let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ThemesCollectionViewCell", for: indexPath) as! ThemesCollectionViewCell
		
		cell.contentView.layer.cornerRadius = 20
		
		cell.themeCellImageView.image = images[indexPath.row]
		
		return cell
	}
	
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
		return UIEdgeInsets(top: 0, left: 20, bottom: 0, right: 20)
	}
	
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
		return 20
	}
	
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
		return 20
	}
	
	func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
		return CGSize(width: view.frame.size.width/2.34, height: view.frame.size.height * 0.3)
	}
}