今天會把首頁的CollectView建立好，首先，先建立三個Cocoa Touch Class，都是CollectionViewCell：

import UIKit

class TypeCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var imgCell: UIImageView!
    
    static var identifer = "TypeCollectionViewCell"
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

}

class MoreImformationsCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var imgCell: UIImageView!
    static let identifier = "MoreImformationsCollectionViewCell"
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

}

import UIKit

class ResaurantCollectionViewCell: UICollectionViewCell {
    
    // MARK: - IBOutlet
    
    @IBOutlet weak var imgCell: UIImageView!
    @IBOutlet weak var btnCell: UIButton!
    
    // MARK: - Variables
    
    static let identifier = "ResaurantCollectionViewCell"

    // MARK: - LifeCycle

    override func awakeFromNib() {
        super.awakeFromNib()
        setupUI()
    }
    
    
    
    // MARK: - UI Setting
    
    func setupUI() {
        btnCell.setTitle(" ", for: .normal)
    }
    
    // MARK: - IBAction
    
    @IBAction func btnClick(_ sender: Any) {
        print("123")
    }
    
}

接著到主畫面設定：

        covFoodType.tag = 0
        covFoodType.dataSource = self
        covFoodType.delegate = self
        covFoodType.register(ResaurantCollectionViewCell.loadFromNib(), forCellWithReuseIdentifier: ResaurantCollectionViewCell.identifier)
        
        covResaurant.tag = 1
        covResaurant.delegate = self
        covResaurant.dataSource = self
        covResaurant.register(TypeCollectionViewCell.loadFromNib(), forCellWithReuseIdentifier: TypeCollectionViewCell.identifer)
        
        
        covMoreImformations.tag = 2
        covMoreImformations.delegate = self
        covMoreImformations.dataSource = self
        covMoreImformations.register(MoreImformationsCollectionViewCell.loadFromNib(), forCellWithReuseIdentifier: MoreImformationsCollectionViewCell.identifier)

然後是Delegate:

extension HomeViewController: UICollectionViewDelegate, UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        
        switch collectionView.tag {
        case 0:
            return 4
        case 1:
            return 4
        case 2:
            return 4
        default:
            return 0
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        switch collectionView.tag {
        case 0:
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ResaurantCollectionViewCell.identifier, for: indexPath) as!
            ResaurantCollectionViewCell
        cell.imgCell.image = UIImage(named: foodType[indexPath.row])
            return cell
        case 1:
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: TypeCollectionViewCell.identifer, for: indexPath) as!
            TypeCollectionViewCell
        cell.imgCell.image = UIImage(named: foodType[indexPath.row])
            return cell
        case 2:
            let cell = collectionView.dequeueReusableCell(withReuseIdentifier: MoreImformationsCollectionViewCell.identifier, for: indexPath) as!
            MoreImformationsCollectionViewCell
        cell.imgCell.image = UIImage(named: foodType[indexPath.row])
            return cell
        default:
            return UICollectionViewCell()
        }
        return UICollectionViewCell()
    }
    
}