Force UITableView to Scroll to Tops of Cells

Question

Is there a way to make UITableViews scroll cell to cell? That is, the top of the Table View is always the top of a UITableViewCell.

I tried the pageation flag, but t

Answer 1

This approach handles a table view with varying row heights. It assumes the table view has a single section.

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView
                     withVelocity:(CGPoint)velocity
              targetContentOffset:(inout CGPoint *)targetContentOffset {

    // Find the row where the animation will currently end.
    NSInteger targetRow = [[self.tableView indexPathForRowAtPoint:*targetContentOffset] row];

    // Tell the animation to end at the top of that row.
    *targetContentOffset = [self offsetForTopOfRow:targetRow];
}

The offset is calculated by this helper method, which sums the heights of all rows above the target row.

- (CGPoint)offsetForTopOfRow:(NSInteger)row {

    CGPoint offset = CGPointZero;

    for (int i = 0; i < row; i++) {
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
        CGFloat height = [self.tableView.delegate tableView:self.tableView heightForRowAtIndexPath:indexPath];
        offset.y += height;
    }

    return offset;
}