ShopQuick - Favorites Manager Basic

gistfile1.swift

class FavoritesManager {
    
    static let sharedInstance = FavoritesManager()
    
    let userDefaults = NSUserDefaults.standardUserDefaults()
    
    let productsKey = "com.detroitlabs.shopfast.favorites"
    
    private var products : [Product] = []
    
    init() {
        
        self.loadProductsFromDefaults()
        
    }
    
    func productAtIndex(index: Int) -> Product {
        return self.products[index]
    }
    
    private func saveProductsToDefaults() {
        let productsKeyedArchive = NSKeyedArchiver.archivedDataWithRootObject(self.products)
        self.userDefaults.setObject(productsKeyedArchive, forKey: productsKey)
    }
    
    private func loadProductsFromDefaults() {
        if let data = self.userDefaults.objectForKey(productsKey) as? NSData {
            let unarc = NSKeyedUnarchiver(forReadingWithData: data)
            if let savedProducts = unarc.decodeObjectForKey("root") as? [Product] {
                self.products = savedProducts
            }
        }
    }
    
}