swift – 无法使用全局变量访问collectionView单元格变量

概述在这里,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: UICollectionVie 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

Value of type ‘UICollectionVIEwCell?’ has no member ‘imgAttachment’

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} 总结

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