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];

}