afnetworking in singletone and waiting requests from another controller (objective c) - ios

Question

I am writing an Apple iPhone application.
A have got a class - singleton which sending a requests to the server (ServerManager) and a ViewController which using methods of singletone and another methods (analyzing requests for example).
How to perform queries from singletone in viewcontroller on the line? One after the other? Not parallel?
//for example authoriztion in Twitter
//here my query for the Twitter Server
- (void) getTweetsFromTW:(NSInteger) count
onSuccess:(void(^)(NSArray* news)) success
onFailure:(void(^)(NSError* error, NSInteger statusCode)) failure {
//NSString* countStr = [NSString stringWithFormat:#"%ld", count];
NSDictionary* params = [NSDictionary dictionaryWithObjectsAndKeys:
[NSString stringWithFormat:#"ld", count], #"count", nil];
NSError* requestError = [[NSError alloc] init];
NSURLRequest* myRequest = [[[Twitter sharedInstance] APIClient]
URLRequestWithMethod:#"GET"
URL:#"https://api.twitter.com/1.1/statuses/home_timeline.json"
parameters:params
error:&requestError];
[[[Twitter sharedInstance] APIClient]
sendTwitterRequest:myRequest
completion:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (data) {
NSError* jsonError;
NSArray* jsonArray = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&jsonError];
//NSLog(#"%#", jsonArray); //вывод ответа сервера
NSMutableArray* textsArray = [[NSMutableArray alloc] init];
for (int i = 0; i < [jsonArray count]; i++) {
NSArray* test = [[NSArray alloc] initWithObjects:[jsonArray objectAtIndex:i], nil];
NSDictionary* dict = [NSDictionary dictionaryWithObjects:test
forKeys:[test valueForKey:#"intField"]];
NSDictionary* dictionary = dict[[[dict allKeys] objectAtIndex:0]];
//NSLog(#"%#", [dictionary objectForKey:#"text"]); //вывод текстов твитов
[textsArray addObject:[dictionary objectForKey:#"text"]];
}
if (success) {
success(textsArray);
}
}
}];
}
//here is my viewcontroller
[[ServerManager sharedManager] getTweetsFromTW:10
onSuccess:^(NSArray *news) {
for (int i = 0; i < [news count]; i++) {
NSLog(#"%#", [news objectAtIndex:i]);
}
[_textsFromTW addObjectsFromArray:news];
}
onFailure:^(NSError *error, NSInteger statusCode) {
}];
//I need send this requests in a line not parallel
[[ServerManager sharedManager] getNewsFromVK:300
filter:#"post"
onSuccess:^(NSArray *news) {
for (int i = 0; i < [news count]; i++) {
NSLog(#"%#", [[news objectAtIndex:i] objectForKey:#"text"]);
if ([[news objectAtIndex:i] objectForKey:#"text"] != nil) {
[_textsFromVK addObject:[[news objectAtIndex:i] objectForKey:#"text"]];
}
}
}
onFailure:^(NSError *error, NSInteger statusCode) {
}];