UICollectionViewCell的点击效果

- (BOOL)collectionView:(UICollectionView*)collectionView shouldHighlightItemAtIndexPath:(NSIndexPath*)indexPath{

    return YES;

}

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

    UICollectionViewCell* cell = [collectionView cellForItemAtIndexPath:indexPath];

    cell.backgroundColor = YBLineGrayColor;

}

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

    UICollectionViewCell* cell = [collectionView cellForItemAtIndexPath:indexPath];

// 要延时才有效果

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        cell.backgroundColor = [UIColor whiteColor];

    });

}