TTBroadcast.m

- (void)fetchChatHistoryWithBlock:(TTObjectResultBlock)block
{
    NSString *path = [NSString stringWithFormat:@"/api/broadcasts/%@/chats", [self.broadcastID stringValue]];
    [[TTAPIClient sharedClient] getPath:path parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"response object: %@", responseObject);
        NSAssertIsArray(responseObject);
        NSMutableArray *chats = [NSMutableArray array];
        for (NSDictionary *chatDict in responseObject) {
            NSDictionary *history = @{
                                      @"user_id" : @"user_id",
                                      @"content" : @"content",
                                      @"broadcast_id" : @"broadcast_id"
                                      };
            [chats addObject:history];
        }
        if (block) block(chats, nil);
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (block) block(nil, error);
    }];
}

TTBroadcastController.m

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    [self.broadcast fetchChatHistoryWithBlock:^(id responseObject, NSError *error) {
        if (error) {
            DDLogError(@"error retreiving chats history(%@)", [error localizedDescription]);
        }
        else {
            [responseObject valueForKey:@""];
            [responseObject valueForKey:@""];
            [responseObject valueForKey:@""];
        }
    }];
    [MBProgressHUD hideAllHUDsForView:self.view animated:YES];
}