gistfile1.swift

// Grab API instance
let API = APIClient.instance

// Attempt to authenticate with username and password
let Authentication = API.authenticate(username, password: password)
Authentication.onSuccess { user in
  println("Logged in as \(user.userName!)!")
  
  // Load user images after a successful sign-in
  let UserImages = API.imagesForUserId(user.id!, nextToken: nil)
  UserImages.onSuccess { images in
    println("Loaded \(images.count) images for \(user.userName!).")
  }

  // In case of error
  UserImages.onFailure { error in
    println("Failed to load user images: \(error.localizedDescription)")
  }
}
Authentication.onFailure { error in
  println("Failed to authenticate user \(username): \(error.localizedDescription)")
}