AFNetworking 2.0 new architecture use serializers for creating requests and parsing responses.
In order to set the authorization header, you should first initialize a request operation manager that replaces the AFHTTPClient, create a serializer and then call the dedicated method to set the header.
For example you code would become:
AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:[NSURL URLWithString:@"http://examplewebsite.com"]];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
[manager.requestSerializer setAuthorizationHeaderFieldWithUsername:@"userName" password:@"password"];
You should read the documentation and the migration guide to understand the new concepts that come with the version 2.0 of AFNetworking.
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