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

For

1. Delegate/Protocol

It is generally used when you want to update or done any procedure in you previous controller from current view controller. so if you want to update values in previous view controller then Delegate/Protocol is preferable.

So it is basically 1-to-1 Relation.

2. Notification

It is generally used when you want to update values in your view controller from any other viewcontroller. so its basically 1-to-n relation.

So use this type as per your requirement.

Maybe this will help you.