ios - CollectionView 单元格未显示

Question

我正在尝试在 UICollectionView 中显示图像。下面的代码负责显示单元格。

    super.viewWillAppear(animated)
    memes = appDelegate.memes
    collectionView?.reloadData()

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    let space:CGFloat = 3.0
    let dimension = (view.frame.size.width - (2 * space)) / 3.0

    flowLayout.minimumInteritemSpacing = space
    flowLayout.minimumLineSpacing = space
    flowLayout.itemSize = CGSize(width: dimension, height: dimension)
    flowLayout.sectionInset = UIEdgeInsets(top: 1.0, left: 1.0, bottom: 1.0, right: 1.0)
}

和

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MemeCollectionViewCell", for: indexPath) as! MemeCollectionViewCell
    let meme = memes[(indexPath as NSIndexPath).row]

    cell.memeImageView?.image = meme.meme
    // Configure the cell

    return cell
}

我所看到的只是一个空白的 View Controller 。当我单击屏幕时，会弹出 VC 的详细信息(应该如此)。看起来 View 的信息在那里，但只是没有在屏幕上呈现。我需要进行哪些更改才能确保显示图像？

Answer 1

您的 collectionview 委托(delegate)未被调用。 你必须写

collectionview.delegate = self collectionview.dataSource = self

如果正在召集代表，请检查 meme.meme 是否有图像。