ios - How to pass value in uitextview using segue -

i'm trying create in uitextview every time text encounter kind of symbol "@". text after symbol send other controller.

here's code

- (bool)textview:(uitextview *)atextview shouldchangetextinrange:(nsrange)range replacementtext:(nsstring *)text {     // "length of existing text" - "length of replaced text" + "length of replacement text"     nsinteger newtextlength = [self.addingtext.text length] - range.length + [text length];      if([text isequaltostring:@"@"] || secondstring){         secondstring = true;          nsstring * stringtorange = [self.addingtext.text substringwithrange:nsmakerange(0,range.location)];          // appending typed charactor         stringtorange = [stringtorange stringbyappendingstring:text];          // processing last typed word         nsarray *wordarray       = [stringtorange componentsseparatedbystring:@"@"];         self.getsecondstring    = [wordarray lastobject];          // wordtyped give last typed object         nslog(@"\nwordtyped :  %@",self.getsecondstring);      }      if (newtextlength > 50) {         // don't allow change          [atextview resignfirstresponder];         return no;     }     self.countchar.text = [nsstring stringwithformat:@"%li", (long)newtextlength];      return yes; } 

i code here. work when use nslog time click button send other controller using segue. show null value. hoping here. in advance

here's button code

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {       cameraviewcontroller * cameraviewcontroller = (cameraviewcontroller *)[segue destinationviewcontroller];      if([segue.identifier isequaltostring:@"createtext"]){          nslog(@"prepareforsegue: %@ == %@", self.addingtext.text,self.getsecondstring);         cameraviewcontroller.inputcreatetext =  [nsstring stringwithformat:@"%@", self.addingtext.text];         cameraviewcontroller.secondinputcreatetext =[nsstring stringwithformat:@"%@", self.getsecondstring];     }  } 

i think problem modifying string inside textview:shouldchangetextinrange: gets called every typed in character. if purpose send string after @ on tap on button calculation on button handler or inside prepareforsegue:sender:. if reason want stick own implementation advise put targeted string inside nsmutablearray property created @ class level don't loose data. , can combine string inside array [arrayofstrings componentsjoinedbystring:@" "].