快速選擇新行時CollectionView取消選擇選擇的行

Question

我正在快速執行一個示例collectionView項目。它垂直顯示10行。我更改了選定行的背景顏色。如何在collectionview中選擇新行時取消選擇選定行的背景顏色

碼：

for indexPath in collectionView .indexPathsForSelectedItems(){
            collectionView .deselectItemAtIndexPath(indexPath as? NSIndexPath, animated:false)
        } 
let Cell = collectionView.cellForItemAtIndexPath(indexPath)
Cell?.backgroundColor = UIColor .orangeColor()

Answer 1

將此代碼轉換為swift，您將獲得結果：

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{

UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    cell.backgroundColor = [UIColor magentaColor];

}

-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{

UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    cell.backgroundColor = [UIColor greenColor];

}

Answer 2

這正是您所需要的。 將其設置在cellForItemAtIndexPath內，您無需擔心手動選擇取消選中它的時間。

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    //...
        var bgColorView = UIView()
        bgColorView.backgroundColor = UIColor.whiteColor()
        cell.selectedBackgroundView = bgColorView

        return cell
    }