ios - Adding action to MKMapView annotation -

i have mkmapview bunch of annotations can't add action them. creating mkpointannotation, couldn't add action that. whenever click annotation, nothing happens. here how setting annotations -

cllocationcoordinate2d montevista; montevista.latitude = (double) 37.83029; montevista.longitude = (double) -121.98827;  mkpointannotation *montevistapoint = [[mkpointannotation alloc] init]; montevistapoint.coordinate = montevista; montevistapoint.title = @"monte vista";  cllocationcoordinate2d sanramonvalley; sanramonvalley.latitude = (double) 37.82609; sanramonvalley.longitude = (double) -122.00603;  mkpointannotation *sanramonvalleypoint = [[mkpointannotation alloc] init]; sanramonvalleypoint.coordinate = sanramonvalley; sanramonvalleypoint.title = @"san ramon valley";  cllocationcoordinate2d doughertyvalley; doughertyvalley.latitude = (double) 37.76845; doughertyvalley.longitude = (double) -121.90342;  mkpointannotation *doughertyvalleypoint = [[mkpointannotation alloc] init]; doughertyvalleypoint.coordinate = doughertyvalley; doughertyvalleypoint.title = @"dougherty valley";   nsarray *points = [[nsarray alloc] initwithobjects: montevistapoint, sanramonvalleypoint, doughertyvalleypoint, nil]; [self.schoolmap addannotations:points]; }  - (mkannotationview *)mapview:(mkmapview *)mapview viewforannotation:(id <mkannotation>)annotation {     mkpinannotationview *annotationview = [[mkpinannotationview alloc] initwithannotation:annotation reuseidentifier:nil];     annotationview.enabled = yes;     annotationview.canshowcallout = yes;      nslog(@"pin created");      return annotationview; }  - (void)mapview:(mkmapview *)mapview didselectannotationview:(mkannotationview *)view {      mkpointannotation *testpoint = [[mkpointannotation alloc] init];     testpoint = view.annotation;     self.testtext.text = testpoint.title;      nslog(@"selected"); } 

you need change viewforannotation: method in order customize , implement opendetail: action method

- (mkannotationview *)mapview:(mkmapview *)mapview viewforannotation:(id <mkannotation>)annotation {     if (annotation == mapview.userlocation)     {         return nil;     }      static nsstring *identifier = @"customannotation";     mkannotationview* annview = nil;     if ([annotation iskindofclass:[customannotation class]]) {          annview = (mkannotationview *) [mapview dequeuereusableannotationviewwithidentifier:identifier];         if (annview == nil) {             annview = [[mkannotationview alloc] initwithannotation:annotation reuseidentifier:identifier];         } else {             annview.annotation = annotation;         }          uiimage *image = nil;         image = [uiimage imagenamed:@"pin2"];         uiimageview *imageview = [[uiimageview alloc] initwithimage:image];          [annview addsubview:imageview];         [annview setframe:cgrectmake(0, 0, imageview.frame.size.width, imageview.frame.size.height)];         //        [annview setbackgroundcolor:[uicolor colorwithred:1 green:0 blue:0 alpha:0.1]];         uibutton*accessory = [uibutton buttonwithtype:uibuttontypedetaildisclosure];         [accessory settag:[(customannotation*)annotation tag]];         [accessory addtarget:self action:@selector(opendetail:) forcontrolevents:uicontroleventtouchupinside];         [accessory setframe:cgrectmake(0, 0, 30, 30)];         [annview setrightcalloutaccessoryview:accessory];     }     [annview setenabled:yes];     [annview setcanshowcallout:yes];     return annview; }