UICollectionViewCell 复选标记 return 无

Question

我试着关注 this 但是当我做 cell.checkmarkView.checked = true 它 returns nil 所以一切都崩溃了。这是我的 MyCollectionViewCell：

class MyCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var myLabel: UILabel!

var checkmarkView: SSCheckMark!

override init(frame: CGRect) {
    super.init(frame: frame)
    checkmarkView = SSCheckMark(frame: CGRect(x: frame.width-40, y: 10, width: 35, height: 35))
    checkmarkView.backgroundColor = UIColor.white
    contentView.addSubview(checkmarkView)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    //fatalError("init(coder:) has not been implemented")
}}

你能帮我看看哪里出了问题吗？

我的收藏查看 cellforitemat...

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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
    cell.myLabel.text = self.listCivics()[indexPath.item]
    cell.layer.borderWidth = 1
    cell.checkmarkView.checked = true
    return cell
}

Answer 1

您的单元格是从情节提要中加载的。因此，init(frame:) 不会被调用。您也应该在 init(coder:) 中初始化复选标记。

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    let contentBounds = contentView.bounds
    checkmarkView = SSCheckMark(frame: CGRect(x: contentBounds.width - 40, y: 10, width: 35, height: 35))
    checkmarkView.backgroundColor = UIColor.white
    // adapt to changes in cell size
    checkmarkView.autoresizingMask = [ .flexibleLeftMargin, .flexibleBottomMargin ] 
    contentView.addSubview(checkmarkView)
}

UICollectionViewCell 复选标记 return 无

UICollectionViewCell checkmark return nil

checkmark

ios

uicollectionview

uicollectionviewcell

swift