ios - UIPageViewController programmatically tell what page is showing -

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is there way programmatically tell when page showing in pageviewcontroller? example, instantiated following:

if (index == 0) {         pagecontentviewcontroller = [storyboard instantiateviewcontrollerwithidentifier:@"oncampustable"];     }     else if (index == 1) {         pagecontentviewcontroller = [storyboard instantiateviewcontrollerwithidentifier:@"offcampustable"];     }     else if (index == 2) {         pagecontentviewcontroller = [storyboard instantiateviewcontrollerwithidentifier:@"myeventstable"];     }

i want write 

if (current page "oncampustable") {             method 1         }         else if (current page "offcampustable") {             method 2         }         else if (current page "myeventstable") {             method 3         }

i've tried using index, because of way pages load , stuff, doesn't work properly. thinking of trying access page indicator thing (the little circle things) page number, don't know how that.

i've seen few solutions out there use array of viewcontrollers , comparisons, don't want keep bunch of controllers around (i generate them on fly model), found solution seems work.

basically point property prior , next controllers in data source before , after methods. in delegate's didfinishanimating call compare new controller these properties see if moved forward or backward. 1 caveat before , after don't called if controller has been loaded, reassign property based on didfinishanimating's previousviewcontroller's value.

note, implemented case 1 page displayed.

- (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerbeforeviewcontroller:(uiviewcontroller *)viewcontroller {     if (self.pageindex > 0) {         uiviewcontroller *vc = [self gencontroller:self.tracklist[self.pageindex - 1]];         self.priorvc = vc;         return vc;     } else {         self.priorvc = nil;         return nil;     } }  - (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerafterviewcontroller:(uiviewcontroller *)viewcontroller {     if (self.pageindex < self.tracklist.count - 1) {         uiviewcontroller *vc = [self gencontroller:self.tracklist[self.pageindex + 1]];         self.nextvc = vc;         return vc;     } else {         self.nextvc = nil;         return nil;     } }  - (void)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller didfinishanimating:(bool)finished previousviewcontrollers:(nsarray *)previousviewcontrollers transitioncompleted:(bool)completed {     if (finished && completed) {         if (pageviewcontroller.viewcontrollers.lastobject == self.priorvc) {             nslog(@"back");             self.pageindex--;             self.nextvc = previousviewcontrollers.lastobject;         } else if (pageviewcontroller.viewcontrollers.lastobject == self.nextvc) {             nslog(@"forward");             self.pageindex++;             self.priorvc = previousviewcontrollers.lastobject;         }         nslog(@"page: %ld",self.pageindex);     } }

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