ios - Passing a value from NSObject class back to UIViewController -

i don't know why being difficult can't work. here's basic flow:

i have uiviewcontroller subview uiview has subview uibutton. clicking button instantiates new instance of nsobject called twittercontroller, creates nsurl twitter feed , hands control on tc urlconnection , serialize data returned.

here's relevant code in viewcontroller (pruit_igoe me, feel free follow though don't post : d) :

- (void) gettwitter {  //load new manager twittermanager = [twittercontroller new]; [twittermanager showtwitterfeed:vtwitterfeed:self];  nsurl* twitterfeedpath = [nsurl urlwithstring: @"http://api.twitter.com/1/statuses/user_timeline.json?screen_name=pruit_igoe"];  [twittermanager gettwitterfeed:twitterfeedpath];  //toggle twitter view [self toggleview:vtwitterfeed]; [self toggleview:vcontactcard];  } 

• showtwitterfeed dumps objects in view vtwitterfeed (button close view, images, etc.)
• gettwitterfeed begins nsurlconnection process

in twittercontroller, twitter feed , process here:

- (void)connectiondidfinishloading:(nsurlconnection *)theconnection  {  //do data! nserror *e = nil; //parse json data nsarray *jsonarray = [nsjsonserialization jsonobjectwithdata: receiveddata options: nsjsonreadingmutablecontainers error: &e];  //dump array tweetarray = [[nsmutablearray alloc] init];  for(nsdictionary* thistweetdict in jsonarray) {       nsstring* tweet = [thistweetdict objectforkey:@"text"];     [tweetarray addobject:tweet]; }  } 

this works fine, log tweetarray , text there, log thistweetdict , ton of data twitter sends there. problem want pass tweetarray viewcontroller can't seem figure out how to.

i've done following:

tried returning tweetarray gettwitterfeed came null (my guess method returned array before connection had finished)

tried put in userdefaults keep getting null (same guess above, put in connectiondidfinish , still null)

tried pass reference viewcontroller twittercontroller , call method in vc pass array in twittercontroller error out because says instance of vc doesn't recognize selector. (it's there, i've triple checked).

i sure simple , being dense me this?

edit: here's how tried pass vc:

i pass vc tc using method (this in vc)

[twittermanager showtwitterfeed:vtwitterfeed:self]; 

in vc.h had uiviewcontroller* thisviewcontroller

in vc.m in showtwitterfeed:

- (void) showtwitterfeed : (uiview* ) thetwitterview :  (uiviewcontroller* ) theviewcontroller {      thisviewcontroller = theviewcontroller;      //...other code build view objects 

then in

- (void)connectiondidfinishloading:(nsurlconnection *)theconnection {   ...  for(nsdictionary* thistweetdict in jsonarray) {       nsstring* tweet = [thistweetdict objectforkey:@"text"];     [tweetarray addobject:tweet]; }  [thisviewcontroller gettwitterfeed:tweetarray]; //<--this error out saying selector not available 

back in vc.h

- (void) gettwitterfeed : (nsarray* ) thetwitterfeed; 

and in vc.m

- (void) gettwitterfeed : (nsarray* ) thetwitterfeed {       nslog(@"%@", thetwitterfeed); } 

you can't return gettwitterfeed because connectiondidfinishloading has not been called yet.

what need set protocol in twittercontroller , make viewcontroller delegate of twittercontroller.

then when connectiondidfinishloading occurs , save twitter information can call function delegate (the viewcontroller).

create function called twitterdatareceived:(nsdictionary *)tweetdict in twittercontroller protocol , call in connectiondidfinishloading function: [self.delegate twitterdatareceived:thistweetdict]; or if want send text make twittertextreceived:(nsstring *)thetweet , call [self.delegate twittertextreceived:tweet]; or use array twitterarrayreceived:(nsarray *)tweetarray , [self.delegate twitterarrayreceived:tweetarray];, or whatever want send back.

if unfamiliar setting protocol , delegate there many questions available out, one:objective-c protocol delegates