Question

我创建了一个Xib文件并在ViewController中调用。我还创建了一个CollectionView到Xib文件中。现在我想到达CollectionViewCell来显示单元格。

class ProductVC: UIViewController {

var collection:UICollectionView!
override func viewDidLoad() {
    super.viewDidLoad()

    let productView : ProductDetailView = UIView.fromNib()
    productView.translatesAutoresizingMaskIntoConstraints = false
    self.view.addSubview(productView)

    collection = productView.collectionView
    collection.register(UINib(nibName: "TagCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "TagCollectionViewCell")

    productView.topAnchor.constraint(equalTo: view.safeTopAnchor).isActive = true
    productView.widthAnchor.constraint(equalToConstant: UIScreen.main.bounds.width).isActive = true
    productView.heightAnchor.constraint(equalToConstant: UIScreen.main.bounds.height).isActive = true
}
}

class ProductDetailView: UIView {

@IBOutlet var productTitle: UILabel!
@IBOutlet var dateLabel: UILabel!
@IBOutlet var productImage: UIImageView!
@IBOutlet var productDescriptionLabel: UILabel!
@IBOutlet var collectionView: UICollectionView!

}

class TagCollectionViewCell: UICollectionViewCell {

@IBOutlet var tagName: UILabel!

}

我还添加了以下代码。但是没有任何意义！我的错误在哪里？

extension ProductVC : UICollectionViewDelegate , UICollectionViewDataSource {

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

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    var cell: TagCollectionViewCell! = collectionView.dequeueReusableCell(withReuseIdentifier: "TagCollectionViewCell", for: indexPath) as? TagCollectionViewCell

    if cell == nil {
        collectionView.register(UINib(nibName: "TagCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "TagCollectionViewCell")
        cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TagCollectionViewCell", for: indexPath) as? TagCollectionViewCell
    }

    cell.tagName.text = "aa"

    return cell
}

}

Answer 1

您不符合委托和dataSource协议。我认为这是问题所在。在 collection.register

之后的下面几行

collection.delegate = self
collection.dataSource = self

希望这会起作用。

以编程方式将CollectionViewCell到达Xib

1 个答案: