This article shows how to add text to a pdf.

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- (void)vAddText:(NSString *)text

{

    //prepare to write texts

    PDFPageContent *content = [[PDFPageContent alloc] init];

    [content gsSave];

    PDFMatrix *mat = [[PDFMatrix alloc] init:1 :1 :100 :200];

    [content gsCatMatrix:mat];

    PDFPage *page = [m_doc page:0];

    PDFDocFont *dfont = [m_doc newFontCID:@"Helvetica" :1 | 8];//bold and embed in horizontal writing

    PDF_PAGE_FONT rfont = [page addResFont:dfont];

    [content textBegin];

    [content textSetFont:rfont :20]; //set font and size

    [content setFillColor:0xff0000];

    [content setStrokeCap:2];

    [content textSetCharSpace:0];

    [content textSetWordSpace:0.3f];

    [content textSetLeading:20];

    [content textSetRenderMode:2]; //fill and stroke

    [content textSetHScale:120]; //set horizontal scale

    [content drawText:text];

    [content textEnd];

    [content gsRestore];

    [page addContent:content :true];

    [m_view vRenderSync:0];

    [self refresh];

    [m_doc save];

}