swift – 无法使用全局变量访问collectionView单元格变量
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在这里,我创建了一个collectionView单元变量来访问这两个对象.但是无法访问单元格变量中的对象
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
var cell: UICollectionViewCell!
if collectionView == collectionView1 {
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachment",for: indexPath) as! AttachmentCell
cell.imgAttachment.image = imageArray1[indexPath.row]
cell.delegate = self
}
else if collectionView == collectionView2 {
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachmentView",for: indexPath) as! AttachmentViewCell
cell.imgFileIcon.image = imgArray2[indexPath.row].fileIcon
}
return cell
解决方法
问题出在这里.
var cell: UICollectionViewCell! 您已将该单元格声明为UICollectionViewCell类型.因此,无论您在其中存储哪个子类,您的单元格将只是UICollectionViewCell类型. 你应该这样改变, func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView === collectionView1 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachment",for: indexPath) as! AttachmentCell
cell.imgAttachment.image = imageArray1[indexPath.row]
cell.delegate = self
return cell
} else if collectionView === collectionView2 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachmentView",for: indexPath) as! AttachmentViewCell
cell.imgFileIcon.image = imgArray2[indexPath.row].fileIcon
return cell
} else {
// Return the proper cell for other cases
}
}
或者,如果你是坚定的,你只需要在委托结束时只有一个return语句,那么你可以这样做,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { var yourCell: UICollectionViewCell! if collectionView === collectionView1 { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachment",for: indexPath) as! AttachmentCell cell.imgAttachment.image = imageArray1[indexPath.row] cell.delegate = self yourCell = cell } else if collectionView === collectionView2 { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellAttachmentView",for: indexPath) as! AttachmentViewCell cell.imgFileIcon.image = imgArray2[indexPath.row].fileIcon yourCell = cell } else { // Return the proper cell for other cases } return yourCell } （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |