swift - View Controller 内的collectionView未显示

Question

我正在尝试在 View Controller 中添加一个collectionView。在 View Controller 中，我已经有一些内容，并且我正在尝试将 Collection View 添加为 View Controller 中最后一个内容正下方的 subview 。我不知道还能怎么做。请帮忙。代码如下:

import UIKit

class StoreDetailViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {


override func viewDidLoad() {
    super.viewDidLoad()

    configureUI()
}

func configureUI() {

    view.backgroundColor = .white

    navigationItem.title = "Store"

    let imageView: UIImageView = {
        let image = UIImageView()
        image.image = UIImage(named: "store")
        image.contentMode = .scaleAspectFill
        image.layer.cornerRadius = 16
        image.layer.masksToBounds = true
        return image
    }()

    let nameLabel: UILabel = {
        let name = UILabel()
        name.font = UIFont.systemFont(ofSize: 16, weight: .heavy)
        name.text = names
        name.numberOfLines = 2
        name.textColor = .primaryDark
        return name
    }()

    let descriptionLabel: UILabel = {
        let description = UILabel()
        description.font = UIFont.systemFont(ofSize: 12, weight: .medium)
        description.text = desc
        description.numberOfLines = 5
        description.textColor = .primaryDark
        return description
    }()

    let collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.translateAll()
        cv.delegate = self
        cv.dataSource = self
        cv.register(StoreProductsCell.self, forCellWithReuseIdentifier: "cellId")
        cv.backgroundColor = .red
        return cv
    }()

    view.addSubview(imageView)
    view.addSubview(nameLabel)
    view.addSubview(descriptionLabel)
    view.addSubview(collectionView)

}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as! StoreProductsCell
    cell.backgroundColor = .blue
    return cell
}

}

我还添加了约束，但没有将其包含在代码中。 vc 中的其他细节显示正常，但只是 Collection View 未在 View Controller 内注册

Answer 1

将其添加到 View 后调用collectionView.reloadData()。