如何在swift iOS中更改自定义Collection View单元格的背景颜色？

Question

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

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

    //let imageView = UIImageView()
    //cell.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    cell.layer.borderWidth = 0.5
    cell.layer.borderColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00).cgColor

   //cell.placeLabel.tintColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00).cgColor

    cell.layer.cornerRadius = 40
    cell.layer.masksToBounds = true

    print("places\(indexPath.row)")
    //cell.placeLabel.text = places[indexPath.row] as! String
    cell.placeLabel.text = places[indexPath.row]
    cell.placeLabel.textColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

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

    if (indexPath.row == 0){

        cell.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00)

    }
}

我创建了一个自定义collectionViewCell。当我点击其中一个单元格时，backgroundColor应该更改。我怎样才能做到这一点？

我在didSelectItemItamAt indexpath方法中尝试了它，但它没有用。请帮忙。

Answer 1

您可以使用UICollectionViewCell cellForItemAt indexPath属性，在backgroundColor内设置该属性，现在当您选择单元格时，它将自动更改该单元格的func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! PlaceCollectionViewCell //Your other code //Add code to set selectedBackgroundView property let view = UIView(frame: cell.bounds) // Set background color that you want view.backgroundColor = UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) cell.selectedBackgroundView = view return cell } 。

backgroundColor

现在使用此功能，无需更改didSelectItemAt indexPath中backgroundColor的单元格，它将自动生效并更改所选单元格的{{1}}。

Answer 2

在cellForItemAt或didSelectItemAt

中写下此内容

func collectionView（_ collectionView：UICollectionView，didSelectItemAt indexPath：IndexPath）{

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

if (indexPath.row == 0){

cell.backgroundColor =  UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) 
cell.contentView.backgroundColor =  UIColor(colorLiteralRed: 0.278, green: 0.694, blue: 0.537, alpha: 1.00) 
collectionView.reloadItemsAtIndexPaths(indexPath)

}

}