pdf - pspdfkit Custom Save iOS -

i using pspdfkit ios , can annotate pdf local directory. problem annotation saved automatically. have opened pdf this. how can save pdf when press save button? can custom save button following codes.

pspdfdocument *document = [pspdfdocument documentwithurl:documenturl]; pspdfviewcontroller *pdfcontroller = [[pspdfviewcontroller alloc] initwithdocument:document];  pdfcontroller.openinbuttonitem.openoptions = pspdfopeninoptionsoriginal; uibarbuttonitem *backbutton = [[uibarbuttonitem alloc] initwithtitle:@"back" style:uibarbuttonitemstylebordered target:self action:@selector(backfromdocument)] ; pdfcontroller.leftbarbuttonitems = @[backbutton];  pdfcontroller.rightbarbuttonitems = @[pdfcontroller.annotationbuttonitem, pdfcontroller.searchbuttonitem, pdfcontroller.outlinebuttonitem, pdfcontroller.viewmodebuttonitem];  uinavigationcontroller *navcontroller = [[uinavigationcontroller alloc] initwithrootviewcontroller:pdfcontroller]; [self presentviewcontroller:navcontroller animated:yes completion:null]; 

to disable autosave function call document.annotationsavemode = pspdfannotationsavemodedisabled on pspdfdocument.

to save annotation clicking specific button can call saveannotationswitherror in pspdfannotationparser.