[iOS]swift版内购

//内购Demo，看代码说话吧
class IAPTestViewController: UIViewController ,SKProductsRequestDelegate, SKPaymentTransactionObserver{

    let VERIFY_RECEIPT_URL = "https://buy.itunes.apple.com/verifyReceipt"
    let ITMS_SANDBOX_VERIFY_RECEIPT_URL = "https://sandbox.itunes.apple.com/verifyReceipt"

    var productDict:NSMutableDictionary!

    override func viewDidLoad() {
        super.viewDidLoad()
        SKPaymentQueue.defaultQueue().addTransactionObserver(self)
        requestProducts()//请求产品列表资料

    }
    deinit{
        SKPaymentQueue.defaultQueue().removeTransactionObserver(self)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // 点击购买产品后触发的
    func onSelectRechargePackages(productId: String){
        //先判断是否支持内购
        if(SKPaymentQueue.canMakePayments()){
            buyProduct(productDict[productId] as! SKProduct)
        }
        else{
            println("============不支持内购功能")
        }

    }
    //询问苹果的服务器能够销售哪些商品
    func requestProducts(){
        var set = NSSet(array: ["你的产品id1","产品id2"。。。。更多])
        let request = SKProductsRequest(productIdentifiers: set as Set<NSObject>)
        request.delegate = self;
        request.start()
    }

    // 以上查询的回调函数
    func productsRequest(request: SKProductsRequest!, didReceiveResponse response: SKProductsResponse!) {
        if (productDict == nil) {
            productDict = NSMutableDictionary(capacity: response.products.count)
        }

        for product in response.products as! [SKProduct] {
            // 激活了对应的销售操作按钮，相当于商店的商品上架允许销售
            println("=======Product id=======\(product.productIdentifier)")
            println("===产品标题 ==========\(product.localizedTitle)")
            println("====产品描述信息==========\(product.localizedDescription)")
            println("=====价格: =========\(product.price)")

            // 填充商品字典
            productDict.setObject(product, forKey: product.productIdentifier)

        }
    }
    // 购买对应的产品
    func buyProduct(product: SKProduct){

        var payment = SKPayment(product: product)
        SKPaymentQueue.defaultQueue().addPayment(payment)
    }
    func paymentQueue(queue: SKPaymentQueue!, updatedTransactions transactions: [AnyObject]!){
        // 调试
        for transaction in transactions {
            // 如果小票状态是购买完成
            if (SKPaymentTransactionState.Purchased == transaction.transactionState) {
                // 更新界面或者数据，把用户购买得商品交给用户
                println("支付成了＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝")
                // 验证购买凭据
                self.verifyPruchase()

                // 将交易从交易队列中删除
                SKPaymentQueue.defaultQueue().finishTransaction(transaction as! SKPaymentTransaction)

            }
            else if(SKPaymentTransactionState.Failed == transaction.transactionState){
                println("支付失败＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝")
                SKPaymentQueue.defaultQueue().finishTransaction(transaction as! SKPaymentTransaction)
            }
            else if (SKPaymentTransactionState.Restored == transaction.transactionState) {//恢复购买
                // 更新界面或者数据，把用户购买得商品交给用户
                // ...

                // 将交易从交易队列中删除
                SKPaymentQueue.defaultQueue().finishTransaction(transaction as! SKPaymentTransaction)
            }

        }

    }
    func verifyPruchase(){
        // 验证凭据，获取到苹果返回的交易凭据
        // appStoreReceiptURL iOS7.0增加的，购买交易完成后，会将凭据存放在该地址
        let receiptURL = NSBundle.mainBundle().appStoreReceiptURL
        // 从沙盒中获取到购买凭据
        let receiptData = NSData(contentsOfURL: receiptURL!)
        // 发送网络POST请求，对购买凭据进行验证
        let url = NSURL(string: ITMS_SANDBOX_VERIFY_RECEIPT_URL)
        // 国内访问苹果服务器比较慢，timeoutInterval需要长一点
        let request = NSMutableURLRequest(URL: url!, cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy, timeoutInterval: 10.0)
        request.HTTPMethod = "POST"
        // 在网络中传输数据，大多情况下是传输的字符串而不是二进制数据
        // 传输的是BASE64编码的字符串
        /**
            BASE64 常用的编码方案，通常用于数据传输，以及加密算法的基础算法，传输过程中能够保证数据传输的稳定性
            BASE64是可以编码和解码的
        */
        let encodeStr = receiptData?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.EncodingEndLineWithLineFeed)

        let payload = NSString(string: "{\"receipt-data\" : \"" + encodeStr! + "\"}")
        println(payload)
        let payloadData = payload.dataUsingEncoding(NSUTF8StringEncoding)

        request.HTTPBody = payloadData;

        // 提交验证请求，并获得官方的验证JSON结果
        let result = NSURLConnection.sendSynchronousRequest(request, returningResponse: nil, error: nil)

        // 官方验证结果为空
        if (result == nil) {
            //验证失败
            println("验证失败")
            return
        }
        var dict: AnyObject? = NSJSONSerialization.JSONObjectWithData(result!, options: NSJSONReadingOptions.AllowFragments, error: nil)
        if (dict != nil) {
            // 比对字典中以下信息基本上可以保证数据安全
            // bundle_id&application_version&product_id&transaction_id
            // 验证成功
            println(dict)
        }
    }
    func restorePurchase(){
        SKPaymentQueue.defaultQueue().restoreCompletedTransactions()
    }

}

PS：过程中遇到的问题

1.点击购买没有弹出输入账户密码框，解决方法是 到手机设置里面iTunes Store 与 App Store 里面注销你原本的账号

2.每次进来添加了 SKPaymentQueue.defaultQueue().addTransactionObserver(self) 状态监听之后，就会调用很多次 支付失败 ，原因是之前调试失败之后，没有 SKPaymentQueue.defaultQueue().finishTransaction(transaction as! SKPaymentTransaction) ，所以每次系统自动帮你请求上一次失败的操作，结果还是继续失败。