IOS - Delegate vs Notification

Question

Would like to have your opinion regarding the following architecture:

In My app I have a static class (LoginManager) that handles an asynchronous login. Once the login phase is completed the app should response and transition to another state.

I have 2 implementation suggestions

1. using a Delegate:

   import Foundation
   
   protocol LoginManagerDelegate{
       func onLogin(result:AnyObject)
   }
   
   class LoginManager {
       struct Wrapper {
           static var delegate:LoginManagerDelegate?
       }
   
       class func userDidLogin(result){            
            Wrapper.delegate?.onLogin(result)
       }
   
   }
   

2. using a Notification:

   import Foundation
   
   class LoginManager {
   
       class func userDidLogin(result){            
            NSNotificationCenter.defaultCenter().postNotificationName("onLogin", object: result)
       }
   
   }
   

Q:What would be the best approach?

Answer 1

If the

func onLogin(result:AnyObject)

Is implemented in only one class, I would go with the delegate. More appropriate for a 1 to 1 relation.

If it's an 1 to n relation, I would go with the Notification.

I don't like to rely on Notification (personal taste), so I usually handle the login/logout transitions in my AppDelegate, which permits me to use the Delegate pattern.