appname.ViewsVC collectionView:cellForItemAtIndexPath:]: 无法识别的选择器发送到实例

Question

我正在构建集合视图并收到以下错误。

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[appname.ViewsVC collectionView:cellForItemAtIndexPath:]: unrecognized selector sent to instance

这是我自定义单元格的代码

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

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ViewsCell", for: indexPath) as! ViewsCell

    cell.fullnameLbl.text = self.viewsArray[(indexPath as NSIndexPath).row].capitalizeEachWord

    // pic setup
    avaArray[indexPath.row].getDataInBackground { (data:Data?, error:Error?) in
        if error == nil {
            cell.avaImg.image = UIImage(data: data!)
        }
    }

    return cell
}

我在故事板中创建了集合视图和单元格，并为它们提供了正确的标识符。我还将 UIimageView 和标签连接到单元格 class。

任何想法可能是错误的。

Answer 1

我意识到我在视图控制器的顶部缺少 UICollectionViewDataSource 和 UICollectionViewDelegate

class ViewsVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

appname.ViewsVC collectionView:cellForItemAtIndexPath:]: 无法识别的选择器发送到实例

appname.ViewsVC collectionView:cellForItemAtIndexPath:]: unrecognized selector sent to instance

ios

parse-platform

uicollectionview

uicollectionviewcell