Return value based on AFNetworking response - objective-c

Question

I'm trying to create a function that will return a value based on the response from an AFNetworking POST request.
However, I can't figure out a way to do this, as the function is asynchronous, so the value is returned before the response is actually received.
int didLogin;
__block NSString *response;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"text/html"];
NSDictionary *parameters = #{#"username":username, #"password":password};
[manager POST:loginUrl parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
//json "response" object from server response
response = [responseObject objectForKey:#"response"];
NSLog(#"Response: %#", response);
[HUD hide:YES];
[HUD removeFromSuperViewOnHide];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[HUD hide:YES];
[HUD removeFromSuperViewOnHide];
NSLog(#"Login Error: %#", error);
}];
if ([response compare:#"1"] == NSOrderedSame || [response compare:#"2"] == NSOrderedSame)
{
//successful login/1-new device/2-existing device
didLogin = 1;
}
else if ([response compare:#"0"] == NSOrderedSame)
{
//unsuccessful login/invalid password
didLogin = 0;
}
else{
//unsuccessful login
didLogin = 2;
}
At which point it would return didLogin.
Is there any way to make this work, or do I need to use a synchronous request?

Answer 1

Your method should take a callback block as a parameter and then you should call that block with didLogin when the asynchronous process is complete. You need to embrace the asynchronous nature of what you're trying to do throughout your code.