Enables creation of SKProduct and SKPaymentTransaction so StoreKit work flow and model can be the same on a simulator as it is on a device.

StoreKitUtil.swift

import StoreKit

public extension SKProduct {
    
    convenience init(d : Dictionary<String, AnyObject>) {
        self.init()
        self.setValue(d["uid"], forKey: "productIdentifier")
        self.setValue(d["title"], forKey: "localizedTitle")
        self.setValue(d["detail"], forKey: "localizedDescription")
        self.setValue(NSDecimalNumber(string: (d["price"] as! String?)), forKey: "price")
        self.setValue(NSLocale.currentLocale, forKey: "priceLocale")
    }
    
    
    public override var description: String {
        return "productIdentifier \(productIdentifier), localizedTitle \(localizedTitle), localizedDescription \(localizedDescription), price \(price), priceLocale \(priceLocale.identifier)"
    }
}

public extension SKPaymentTransaction {
    
    convenience init(uid : String, state : Int) {
        self.init()
        self.setValue(uid, forKey: "transactionIdentifier")
        self.setValue(NSNumber.init(value: Int32(state)), forKey: "transactionState")
        self.setValue(NSDate(), forKey: "transactionDate")
    }
    
    public override var description: String {
        return "transactionIdentifier \(String(describing: transactionIdentifier)), transactionState \(transactionState.rawValue), transactionDate \(transactionDate)"
    }
}