Each box when tapped has to be expanded from the same position

[ambili]

I wanted 3 boxes in a single row with the same size. When user taps on any box, it must get enlarged & the other items have to get aligned accordingly.

I am using the same code given in RFQuiltLayout, but made a few changes as given below.

- (void)viewDidLoad {
    .....
    RFQuiltLayout* layout = (id)[self.collectionView collectionViewLayout];
    layout.direction = UICollectionViewScrollDirectionVertical;
    layout.blockPixels = CGSizeMake(97,97);
    [self.collectionView reloadData];
}


- (void) setNumberArrays {

    [self.numbers removeAllObjects];
    [self.numberWidths removeAllObjects];
    [self.numberHeights removeAllObjects];

    for (NSInteger i = 0; i< [[self.entries objectAtIndex:0] count]; i++) {

        [self.numbers addObject:@(i)];
        if (i == AppDelegateObj.bigBoxIndex) {
            [self.numberWidths addObject:@(2)];
            [self.numberHeights addObject:@(2)];
        }
        else {
            [self.numberWidths addObject:@(1)];
            [self.numberHeights addObject:@(1)];
        }
    }
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (AppDelegateObj.bigBoxIndex == -1) {
        AppDelegateObj.bigBoxIndex = indexPath.row;
    }
    else {
        AppDelegateObj.bigBoxIndex = -1;
    }
    [self setNumberArrays];
    if(!self.numbers.count || indexPath.row > self.numbers.count) return;
    if(isAnimating) return;
    isAnimating = YES;
    [self.collectionView performBatchUpdates:^{
        [self.collectionView reloadData];
    } completion:^(BOOL done) {
        isAnimating = NO;
    }];
}

When user taps on a box, I am just reassigning the arrays 'self.numbers', 'self.numberWidths', 'self.numberHeights' & reloading the UICollectionView.

Suppose user taps on 2, as per the current code the below is happening,

But I want the output to look like,

Please suggest what is the change to be made on code. I tried a lot to change. But failed :(