TitledCollectionViewController.swift

class TitledCollectionViewController: UIViewController {
    lazy var fruitView = TitledCollectionView(produce: .fruit)
    lazy var vegetableView = TitledCollectionView(produce: .vegetable)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
    }
    
    func setupViews() {
        view.backgroundColor = .systemBackground
        view.addSubview(fruitView)
        view.addSubview(vegetableView)
        
        NSLayoutConstraint.activate([
            fruitView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
            fruitView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -20),
            fruitView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 20),
            fruitView.heightAnchor.constraint(equalToConstant: TitledCollectionView.Layout.heightConstant),
            
            vegetableView.topAnchor.constraint(equalTo: fruitView.safeAreaLayoutGuide.bottomAnchor, constant: 20),
            vegetableView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -20),
            vegetableView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 20),
            vegetableView.heightAnchor.constraint(equalToConstant: TitledCollectionView.Layout.heightConstant),
        ])
    }
}