Completion handlers and return values

Question

I want to call a method which will return a value from its completion handler. The method performs asynchronously and I don\'t want to return a value before all the body of

Answer 1

You need to change getCurrentClient to take in a completion block instead of returning a value.

For example:

-(void)getCurrentClientWithCompletionHandler:(void (^)(NSDictionary* currentClient))handler
{
    NXOAuth2Account *currentAccount = [[[NXOAuth2AccountStore sharedStore] accounts] lastObject];

    [NXOAuth2Request performMethod:@"GET"
                        onResource:[NSURL URLWithString:[NSString stringWithFormat:@"%@/clients/%@", kCatapultHost, currentAccount.userData[@"account_name"]]]
                   usingParameters:nil
                       withAccount:currentAccount
               sendProgressHandler:nil
                   responseHandler:^ (NSURLResponse *response, NSData *responseData, NSError *error) {
                        NSError *jsonError;

                        NSDictionary* deserializedDict = [NSJSONSerialization JSONObjectWithData:responseData
                                                                                         options:kNilOptions
                                                                                           error:&jsonError];
                        handler(deserializedDict);
                }];
}

It's important to remember that getCurrentClient will return immediately, while the network request is dispatched on another thread. Don't forget that if you want to update the UI using your response handler, you need to have your handler run on the main thread.