Swift Singleton

Question

I'm currently working on a Shopify Application that uses their mobile buy sdk, and I'm trying to save the cart using a Singleton in Swift. I have a Singleton class that's set up like so:

class Singleton {

   static let sharedInstance = Singleton()

   init() {
     var cart = BUYCart()
     println(cart)
   }
}

When it gets initialized, it prints the BUYCart in the console. The problem is I'm trying to access the saved cart in a controller like so:

  println(Singleton.sharedInstance.cart.lineItems)

I get the following error:

 Singleton does not have member named 'cart'

Answer 1

You should declare the variable at instance level. In your code its declared inside the constructor, so you can only access it inside the constructor. Not from outside the class like you are doing in your code.

class Singleton {

   static let sharedInstance = Singleton()
   var cart = BUYCart()

   init() {
     println(cart)
   }
}