我有一个自定义的 Collection View 单元格:
class chatMessageCell: UICollectionViewCell {
let textView : UITextView = {
let tv = UITextView()
tv.text = "SAMPLE TEXT"
tv.font = UIFont.systemFont(ofSize: 16)
return tv
}()
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = UIColor.red
self.addSubview(textView)
textView.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
textView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
textView.widthAnchor.constraint(equalToConstant: 200).isActive = true
textView.heightAnchor.constraint(equalTo: self.heightAnchor).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
它也被注册了:
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "Chat"
collectionView?.delegate = self
collectionView?.dataSource = self
collectionView?.collectionViewLayout = UICollectionViewFlowLayout()
collectionView?.backgroundColor = UIColor.white
collectionView?.register(chatMessageCell.self, forCellWithReuseIdentifier: cellID)
}
并创建于:
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellID, for: indexPath) as! chatMessageCell
let message = messages[indexPath.item]
cell.textView.text = message.text
return cell
}
但是，屏幕上只出现了一些红色单元格，但它们不包含任何文本或 textView。我做错了什么？
最佳答案
您应该将所有 subview 添加到 UICollectionView 的 contentView，而不是 UICollectionView 实例本身。所以不是这个:
self.addSubview(textView)
试试这个:
self.contentView.addSubview(textView)
关于ios - CollectionViewCell 不显示 TextView，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50172701/