AFNetworking 2.0 : AFHTTPRequestOperationManager asynchronous methode invoke - ios

Question

I am using AFNetworking 2.0 for networking of my application, I have implemented a method to check the login of a user
-(NSString *) loginWith : (NSString *) email andPassword :(NSString *) password
{
__block NSString * result ;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *params = #{#"email": email, #"password": password};
manager.responseSerializer = [AFJSONResponseSerializer serializer];
[manager POST:[kROOT_URL stringByAppendingString:#"auth/"] parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSLog(#"JSON: %#", (NSDictionary*)responseObject);
[[NSUserDefaults standardUserDefaults] setObject:responseObject forKey:USER_KEY];
[[NSUserDefaults standardUserDefaults] synchronize];
result = [responseObject objectForKey:#"id"];
NSLog(#"result :: %#",result);
} failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSLog(#"Error: %#", error);
result = nil;
}];
return result;
}
and from other view controller I am invoking this method :
NSString * result = [self.user loginWith:emailCell.textField.text andPassword:passCell.textField.text];
NSLog(#"Result: %#",result);
the problem is that I get "null" as the object of result, This is because that when the NSlog is executed the network process was doing in background thread, so how I correct the implementation, so then I can get the result in the right moment, after fetching
Thank you

Answer 1

You should add a “callback“ block parameter to your method signature, and call that block when the request is done.
- (void)loginWith:(NSString *)email andPassword:(NSString *)password complete:(void(^)(id result, NSError *error))block {
// ...
[manager POST:[kROOT_URL stringByAppendingString:#"auth/"] parameters:params success:^(AFHTTPRequestOperation *operation, id responseObject)
{
// ...
result = [responseObject objectForKey:#"id"];
if (block) block(result, nil)
} failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
if (block) block(nil, error)
}];
}
When calling the method, pass the callback block where you can read the result value:
[self.user loginWith:emailCell.textField.text andPassword:passCell.textField.text complete:^(id result, NSError *error) {
if (error)
NSLog(#"Error: %#", error);
else
NSLog(#"Result: %#", result);
}];