这是我到目前为止,但是我需要设置边距：
def send_fax
contact = Contact.find_by_id(self.contact_id)
pdf = Prawn::Document.new
pdf.font "Times-Roman"
pdf.move_down(20)
pdf.text "ATTN: #{contact.first_name} #{contact.last_name}",:size =>,:style => :bold
pdf.text "RE: #{self.subject}"
pdf.move_down(20)
pdf.text "#{self.body}"
OutboundMailer.deliver_fax_email(contact,self,pdf)
end
解决方法
Prawn :: Document.new(：margin => [0,0])
:margin: Sets the margin on all sides in points [0.5 inch] :left_margin: Sets the left margin in points [0.5 inch] :right_margin: Sets the right margin in points [0.5 inch] :top_margin: Sets the top margin in points [0.5 inch] :bottom_margin: Sets the bottom margin in points [0.5 inch]