ios - Changing UITextView with if statement from IBAction -

i've been searching lot seems can't figure out. i'm pretty new ios development , apologize if doing things wrong.

here situation.

i trying switch content view of detailviewcontroller via button should send next text view or same view different text.

this header file.

#import <uikit/uikit.h>  @interface detailviewcontroller : uiviewcontroller @property (strong, nonatomic) iboutlet uitextview *rowcontent; @property int rownumber; @property (strong, nonatomic) nsstring * rowname; @property (strong, nonatomic) iboutlet uibarbuttonitem *rightarrow;  @end 

my tableviewcontroller redirects me detailviewcontoller depending on cell i've selected. in detailviewcontroller have button want switch next text instead of me going tableviewcontroller , selecting different cell.

 //detailviewcontroller //set title of view self.title = rowname;  //set uitextview basec on rownumber switch (rownumber) {     case 0:         rowcontent.text = [nsstring stringwithcontentsoffile:[[nsbundle mainbundle]pathforresource:@"file" oftype:@"txt"] encoding:nsutf8stringencoding error:nil];         break;     case 1:         rowcontent.text = [nsstring stringwithcontentsoffile:[[nsbundle mainbundle]pathforresource:@"file1" oftype:@"txt"] encoding:nsutf8stringencoding error:nil];         break;     case 2:         rowcontent.text = [nsstring stringwithcontentsoffile:[[nsbundle mainbundle]pathforresource:@"file2" oftype:@"txt"] encoding:nsutf8stringencoding error:nil];         break;     case 3:         rowcontent.text = [nsstring stringwithcontentsoffile:[[nsbundle mainbundle]pathforresource:@"file3" oftype:@"txt"] encoding:nsutf8stringencoding error:nil];         break;     default:         break;   //tableviewcontroller  -(void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender { //create , instance of our detailviewcontroller detailviewcontroller * dvc = [[detailviewcontroller alloc]init]; //set dvc destinationviewcontoller dvc = [segue destinationviewcontroller]; //get indexpath nsindexpath * path = [self.tableview indexpathforselectedrow];  nsstring * thelist = [rowlist objectatindex:path.row]; dvc.rownumber = path.row; dvc.rowname = thelist;   } 

your question bit confusing. if want switch next case, button, write rownumber ++; in button method, , call method switch statement is.