objective c - how can i edit existing pdf file in ios like copy ,zoom,background color,font -

i have load pdf file in uiwebview want copy content pdf file.

hear code :

- (void)viewdidload {     [super viewdidload];       [self editpdf];  } - (void)editpdf {     nsstring* filename = @"new.pdf";      nsarray *arraypaths =     nssearchpathfordirectoriesindomains(                                         nsdocumentdirectory,                                         nsuserdomainmask,                                         yes);     nsstring *path = [arraypaths objectatindex:0];     nsstring* pdffilename = [path stringbyappendingpathcomponent:filename];      nsstring *templatepath = [[nsbundle mainbundle] pathforresource:@"objective_c_tutorial" oftype:@"pdf"];      //create empty pdf file;     uigraphicsbeginpdfcontexttofile(pdffilename, cgrectmake(0,0,600,768), nil);      cfurlref url = cfurlcreatewithfilesystempath (null, (cfstringref)templatepath, kcfurlposixpathstyle, 0);      //open template file     cgpdfdocumentref templatedocument = cgpdfdocumentcreatewithurl(url);     cfrelease(url);      //get amount of pages in template     size_t count = cgpdfdocumentgetnumberofpages(templatedocument);      //for each page in template     (size_t pagenumber = 1; pagenumber <= count; pagenumber++) {         //get bounds of template page         cgpdfpageref templatepage = cgpdfdocumentgetpage(templatedocument, pagenumber);         cgrect templatepagebounds = cgpdfpagegetboxrect(templatepage, kcgpdfcropbox);          //create empty page corresponding bounds in new document         uigraphicsbeginpdfpagewithinfo(templatepagebounds, nil);         cgcontextref context = uigraphicsgetcurrentcontext();          //flip context due different origins         cgcontexttranslatectm(context, 0.0, templatepagebounds.size.height);         cgcontextscalectm(context, 1.0, -1.0);          //copy content of template page on corresponding page in new file         cgcontextdrawpdfpage(context, templatepage);          //flip context         cgcontexttranslatectm(context, 0.0, templatepagebounds.size.height);         cgcontextscalectm(context, 1.0, -1.0);          //create dictionary font         uifont *font = [uifont fontwithname: @"courier" size:12];         nsdictionary *attribdict = [[nsdictionary alloc] initwithobjectsandkeys: font, nsfontattributename, nil];          /* here can drawings */         [@"test" drawatpoint:cgpointmake(200, 300) withattributes:attribdict];     }     cgpdfdocumentrelease(templatedocument);     uigraphicsendpdfcontext();      [self showpdffile]; }  -(void)showpdffile {     nsstring* filename = @"new.pdf";      nsarray *arraypaths =     nssearchpathfordirectoriesindomains(                                         nsdocumentdirectory,                                         nsuserdomainmask,                                         yes);     nsstring *path = [arraypaths objectatindex:0];     nsstring* pdffilename = [path stringbyappendingpathcomponent:filename];      uiwebview* webview = [[uiwebview alloc] initwithframe:cgrectmake(0,0,360,768)];      nsurl *url = [nsurl fileurlwithpath:pdffilename];     nsurlrequest *request = [nsurlrequest requestwithurl:url];     [webview setscalespagetofit:yes];     [webview loadrequest:request];     [self.view addsubview:webview]; } 

check these links

1] pdfrenderer

2] roundtripeditingdemo

hope helps.