当我滚动时，UiCollectionViewCell边框移动单元格

Question

所以，当我尝试滚动我的UICollectionView时，我选择了一个单元格，用细橙色边框显示，当我向后滚动时，另一个单元格有边框。我读到它与细胞被重复使用有关。无论如何我在网上找到了一些代码，但是很难适应多种选择。

找到解决此问题的方法，您只需创建一个选定单元格数组并添加或删除边框

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

方法

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    //each cell is refreshed when page is scrolled


    //Matches every cell to see if it is selected or not and adds or removes borders accordinglly
    NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.item];
    if ( [selectedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
    {
        [cell.layer setBorderColor:[UIColor orangeColor].CGColor];
        cell.layer.borderWidth = 5.0f;


    }
    else
    {
        [cell.layer setBorderColor:[UIColor clearColor].CGColor];
        cell.layer.borderWidth = 0.0f;
    }



    return cell;
}

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    //Adds cells indexPath to selectedCellsArray and adds border around the cell right away
    NSLog(@"selected");
    UICollectionViewCell*selectedCell = [collectionView cellForItemAtIndexPath:indexPath];


    if (![selectedCellsArray containsObject:[NSString stringWithFormat:@"%d",indexPath.item]] ) {
        [selectedCellsArray addObject:[NSString stringWithFormat:@"%d",indexPath.item]];

        [selectedCell.layer setBorderColor:[UIColor orangeColor].CGColor];
        selectedCell.layer.borderWidth = 5.0f;
        NSLog(@"add");
    }

    NSLog(@"keep track of array:%@", selectedCellsArray);

}

-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{
    //Removes cells indexPath from selectedCellsArray and removes border form cell right away
    NSLog(@"deselected");
    UICollectionViewCell*deselectedCell = [collectionView cellForItemAtIndexPath:indexPath];

    if ( [selectedCellsArray containsObject:[NSString stringWithFormat:@"%d",indexPath.item]]  )
    {
        [selectedCellsArray removeObject:[NSString stringWithFormat:@"%d",indexPath.item]];

        [deselectedCell.layer setBorderColor:[UIColor clearColor].CGColor];
        deselectedCell.layer.borderWidth = 0.0f;
        NSLog(@"remove");

    }
  }