UICollectionView 单选

1
down vote
accepted
I got the solution.

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

UICollectionViewCell *selectedCell =
[collectionView cellForItemAtIndexPath:indexPath];

selectedCell.contentView.backgroundColor = nil;
[selectedCell.contentView.layer setBorderColor:[UIColor redColor].CGColor];
[selectedCell.contentView.layer setBorderWidth:3.0f];  
}
and add this delegate method too

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *deselectedCell =
[collectionView cellForItemAtIndexPath:indexPath];
deselectedCell.contentView.backgroundColor = nil;
[deselectedCell.contentView.layer setBorderColor:[UIColor clearColor].CGColor];
[deselectedCell.contentView.layer setBorderWidth:3.0f];
}