ShopQuick - Shopping List Manager - DRY

gistfile1.swift

class ShoppingListManager : ProductManager {
    
    static let sharedInstance = ShoppingListManager()
    
    override init() {
        super.init()
        self.productsKey = "com.detroitlabs.shopfast.products"
        self.loadProductsFromDefaults()
    }
    
    func markPurchasedAtIndex(index: Int) {
        self.products[index].purchased = true
        
        self.saveProductsToDefaults()
    }
  
}