CollectionView(section)

collectionView.swift

class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource {
    
    override func viewDidLoad() {
        super.viewDidLoad() 
    }

    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 2
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 
        if section == 0 {
            return 7
        } else {
            return 2
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
      
        switch(indexPath.section){          
        case 0:           
            cell.backgroundColor = .blue           
        case 1:            
            cell.backgroundColor = .red
        default:
           print("section error")
          
        }        
        return cell        
    }
}