return nsmutablearray from twitter account block - ios

Question

I am trying to make a function which returns a list of twitter users but I am not able to make the function return a nsmutablearray. Here it is the code I execute
-(NSMutableArray*) getTwitterUsersInPosition: (Position*) position
{
// Request access to the Twitter accounts
ACAccountStore *accountStore = [[ACAccountStore alloc] init];
ACAccountType *accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];
[accountStore requestAccessToAccountsWithType:accountType options:nil completion:^(BOOL granted, NSError *error){
if (granted) {
NSArray *accounts = [accountStore accountsWithAccountType:accountType];
// Check if the users has setup at least one Twitter account
if (accounts.count > 0)
{
ACAccount *twitterAccount = [accounts objectAtIndex:0];
// Creating a request to get the info about a user on Twitter
NSArray *keys = [NSArray arrayWithObjects:#"geocode", #"count", nil];
NSArray *objects = [NSArray arrayWithObjects:#"37.781157,-122.398720,100mi", #"2", nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects
forKeys:keys];
SLRequest *twitterInfoRequest = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:SLRequestMethodGET URL:[NSURL URLWithString:#"https://api.twitter.com/1.1/search/tweets.json"] parameters:dictionary];
[twitterInfoRequest setAccount:twitterAccount];
// Making the request
[twitterInfoRequest performRequestWithHandler: ^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
dispatch_async(dispatch_get_main_queue(), ^{
// Check if we reached the rate limit
if ([urlResponse statusCode] == 429) {
NSLog(#"Rate limit reached");
return;
}
// Check if there was an error
if (error) {
NSLog(#"Error: %#", error.localizedDescription);
return;
}
// Check if there is some response data
if (responseData) {
NSError *error = nil;
NSArray *TWData = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableLeaves error:&error];
NSMutableArray *usersArray= [[NSMutableArray alloc] init];
NSMutableArray* statuses= [(NSDictionary *) TWData objectForKey:#"statuses"];
for (NSDictionary* dict in statuses )
{
NSString* user = [[dict objectForKey:#"user"] objectForKey:#"screen_name"];
NSLog(#"%#",user);
[usersArray addObject:user];
}
return userArray; //Here it says "Return type 'NSMutabelArray *' must match previous type 'void' when block literal has unspecified return type
}
});
}];
}
} else {
NSLog(#"No access granted");
}
}];
}
Thanks for your help.

Answer 1

Your method can NOT have a return type because the value you want to return is obtained asynchronously and isn't available until after the method has completed.
You need to rewrite your method so that it returns the data:
To a delegate
Via a block
Into an instance variable and triggers some update
Via a notification
Basically some mechanism that allows you to deal with the asynchronous response. Please don't make the call synchronous.

Answer 2

In the middle of your code you simply write return without a value (as if your method has return type of void):
if ([urlResponse statusCode] == 429) {
NSLog(#"Rate limit reached");
return;
}
// Check if there was an error
if (error) {
NSLog(#"Error: %#", error.localizedDescription);
return;
Change it to return nil and the code should compile.