How to position and wrap long text?

For Cocoa Dev, yeah we can set line spacing for the text using PdfPCell's SetLeading property as: PdfPCell.SetLeading(float fixedleading, float multiplied leading);

Solved

  PdfContentByte cb = writer.DirectContent;
  ColumnText ct = new ColumnText(cb);
  ct.SetSimpleColumn(new Phrase(new Chunk(text, FontFactory.GetFont(FontFactory.HELVETICA, 18, Font.NORMAL))),
                     46, 190, 530, 36, 25, Element.ALIGN_LEFT | Element.ALIGN_TOP);
  ct.Go();