UIPickUP

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

    MGPickerScrollView * tv = (MGPickerScrollView *) scrollView;

 

    float offset = scrollView.contentOffset.y;

    offset += scrollView.contentInset.top;

    if ( (offset < 0) || ((offset +VALUE_HEIGHT) > scrollView.contentSize.height))

    {

        return;

    }

    

    int mod = (int)offset%(int)VALUE_HEIGHT;

    float newValue = (mod >= VALUE_HEIGHT/2.0) ? offset+(VALUE_HEIGHT-mod) : offset-mod;

    float offValue = (mod >= VALUE_HEIGHT/2.0) ? VALUE_HEIGHT - mod: mod;

    //Calculates the indexPath of the cell and set it in the object as property

    NSInteger indexPathRow = (int)(newValue/VALUE_HEIGHT);

    NSLog(@"offset::%f   contentInset.top:: %f   mod:: %d, newValue:: %f,  indexPathRow:: %d offValue:: %f",  scrollView.contentOffset.y, scrollView.contentInset.top, mod, newValue, indexPathRow ,offValue );

    

    UITableViewCell *selectCell = [tv cellForRowAtIndexPath: [NSIndexPath indexPathForRow:indexPathRow inSection:0]];

    if (selectCell == nil && indexPathRow <0 ) {

        return;

    }

    

    if (tv.lastCenterRow >=0 && tv.lastCenterRow != indexPathRow)

    {

        UITableViewCell *cell = [tvcellForRowAtIndexPath: [NSIndexPathindexPathForRow:tv.lastCenterRowinSection:0]];

        cell.textLabel.font = [UIFontfontWithName:FONT_NAME size:14];

        cell.textLabel.textColor =TEXT_COLOR;

    }

   

    selectCell.textLabel.font = [UIFontfontWithName:FONT_NAME size:((18 - 14)/VALUE_HEIGHT*2*(VALUE_HEIGHT-offValue) + 14 )];

    selectCell.textLabel.textColor =SELECTED_TEXT_COLOR;

    tv.lastCenterRow  = indexPathRow;

}