Calculater Collection Viewがしろくなる

Question

import UIKit

class ViewController: UIViewController , UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return numbers.count
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return numbers[section].count
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        return .init(width: collectionView.frame.width, height: 10)
    
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let width = (collectionView.frame.width - 3 * 10) / 4
        return .init(width: width, height: width)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
        return 10
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = calculaterCollectionView.dequeueReusableCell(withReuseIdentifier: "cellld", for: indexPath) as! CalculatorViewCell
     //   cell.backgroundColor = .blue
        return cell
    }
    
    let numbers = [
        ["1","2","3","4"],
        ["1","2","3","4"],
        ["1","2","3","4"],
        ["1","2","3","4"],
        ["1","2","3","4"],
    ]
    
    @IBOutlet weak var numberLabel: UILabel!
    @IBOutlet weak var calculaterCollectionView: UICollectionView!
    @IBOutlet weak var calculatarHeightConstraint: NSLayoutConstraint!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        calculaterCollectionView.delegate = self
        calculaterCollectionView.dataSource = self
        calculaterCollectionView.register(CalculatorViewCell.self, forCellWithReuseIdentifier: "cellld")
        calculatarHeightConstraint.constant = view.frame.width * 1.4
        
        // Do any additional setup after loading the view.
        
        
    }
    
    class CalculatorViewCell: UICollectionViewCell {
        
        override init(frame: CGRect) {
            super.init(frame: frame)
            backgroundColor = .black
        }
        
        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
        
    }


}

Xcode初心者です。
電卓のアプリを作りたいと思っています。
↑のコードを実行したらCalculater Collection Viewがしろくなります。
解決方法を教えて欲しいです。

Comments

[hoshi-takanori]

試しに動かしてみたら、ちゃんと黒くなりましたよ。