ios - Returning from a block - Objective C -

i have class method containing block, of afnetworking in want return 1 dictionary variable, code shown below:

+(nsmutabledictionary*) getfromurl:(nsstring*)url parameterspassed:(nsdictionary*)parameters; {     afhttprequestoperationmanager *manager = [afhttprequestoperationmanager manager];     __block nsmutabledictionary *resultarray;      [manager get:url parameters:parameters success:^(afhttprequestoperation *operation, id responseobject)      {          nslog(@"json: %@", responseobject);          nsmutabledictionary *resultarraytwo = (nsmutabledictionary *)responseobject;          resultarray = resultarraytwo;      }       failure:^(afhttprequestoperation *operation, nserror *error)     {          nslog(@"error: %@, %@", error, operation.responsestring);          uialertview *alertview=[[uialertview alloc] initwithtitle:@"message" message:@"try again" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles: nil];          [alertview show];      }];     return resultarray; } 

how can return resultarray here, returns nothing here due difference in control flow.

i don't have knowledge in objective c block. waiting help.

thank you.

change function design following function using completion blocks

+(void)getfromurl:(nsstring*)url parameterspassed:(nsdictionary*)parameters completion:(void (^) (nsmutablearray *values))completion; {     afhttprequestoperationmanager *manager = [afhttprequestoperationmanager manager];      [manager get:url parameters:parameters success:^(afhttprequestoperation *operation, id responseobject)      {          nslog(@"json: %@", responseobject);          nsmutabledictionary *resultarray = (nsmutabledictionary *)responseobject;          completion(resultarray);      }       failure:^(afhttprequestoperation *operation, nserror *error)     {          nslog(@"error: %@, %@", error, operation.responsestring);          uialertview *alertview=[[uialertview alloc] initwithtitle:@"message" message:@"try again" delegate:nil cancelbuttontitle:@"ok" otherbuttontitles: nil];          [alertview show];          completion(nil);      }];  } 

and call function

[yourclass getfromurl:url parameterspassed:params completion:^(nsmutablearray *values) {         nslog(@"%@",values);  }]; 

update removed array used.

hope helps.