步骤0：在您的iTunes Connect帐户中，创建一个应用内购买。

对于单次购买，请使用以下方法：

1. 进口

   import StoreKit

2. 符合StoreKit委托

    class YOURViewController: UIViewController, SKProductsRequestDelegate, SKPaymentTransactionObserver {

1. 使用用户默认值来跟踪交易

    let defaults = NSUserDefaults.standardUserDefaults()

1. 产品编号。这将与您在iTunes Connect中购买的应用程序相同

    var product_id: NSString?

    override func viewDidLoad() {        
        product_id = "YOUR_PRODUCT_ID"
        super.viewDidLoad()
        SKPaymentQueue.defaultQueue().addTransactionObserver(self)

        //Check if product is purchased

        if (defaults.boolForKey("purchased")){  
           // Hide a view or show content depends on your requirement
           overlayView.hidden = true     
        } else if (!defaults.boolForKey("stonerPurchased")) {
            print("false")            
        }
    }

1. 解锁内容。这是按钮操作，它将初始化购买

    @IBAction func unlockAction(sender: AnyObject) {

       print("About to fetch the products")

       // We check that we are allow to make the purchase.
       if (SKPaymentQueue.canMakePayments()) {
            var productID:NSSet = NSSet(object: self.product_id!);
            var productsRequest:SKProductsRequest = SKProductsRequest(productIdentifiers: productID);
            productsRequest.delegate = self;
            productsRequest.start();
            println("Fetching Products");
        } else {
            print("can't make purchases");
        }    
    }

1. 辅助方法

    func buyProduct(product: SKProduct) {
        println("Sending the Payment Request to Apple");
        var payment = SKPayment(product: product)
        SKPaymentQueue.defaultQueue().addPayment(payment);
    }

1. IAP的代表方法

    func productsRequest (request: SKProductsRequest, didReceiveResponse response: SKProductsResponse) {

        var count : Int = response.products.count
        if (count>0) {
            var validProducts = response.products
            var validProduct: SKProduct = response.products[0] as SKProduct
            if (validProduct.productIdentifier == self.product_id) {
                print(validProduct.localizedTitle)
                print(validProduct.localizedDescription)
                print(validProduct.price)
                buyProduct(validProduct);
            } else {
                print(validProduct.productIdentifier)
            }
        } else {
            print("nothing")
        }
    }    

    func request(request: SKRequest!, didFailWithError error: NSError!) {
        print("Error Fetching product information");
    }

    func paymentQueue(queue: SKPaymentQueue!, updatedTransactions transactions: [AnyObject]!)    {
        print("Received Payment Transaction Response from Apple");

        for transaction:AnyObject in transactions {
            if let trans:SKPaymentTransaction = transaction as? SKPaymentTransaction{
                switch trans.transactionState {
                case .Purchased:
                    print("Product Purchased");
                    SKPaymentQueue.defaultQueue().finishTransaction(transaction as SKPaymentTransaction)
                    defaults.setBool(true , forKey: "purchased")
                    overlayView.hidden = true
                    break;
                case .Failed:
                    print("Purchased Failed");
                    SKPaymentQueue.defaultQueue().finishTransaction(transaction as SKPaymentTransaction)
                    break;
                case .Restored:
                    print("Already Purchased");
                    SKPaymentQueue.defaultQueue().restoreCompletedTransactions()    
                default:
                    break;
                }
            }
        }        
    }

迅捷 > 3.0

    import StoreKit
    class YOURVIEWController:UIViewController, SKProductsRequestDelegate, SKPaymentTransactionObserver {

    let product_id: NSString = "com.some.inappid" // <!-- Change it to your inapp id

在您的viewDidLoad添加中

    override func viewDidLoad() {
        super.viewDidLoad()
        SKPaymentQueue.default().add(self)

在您的购买按钮操作中

    @IBAction func buyNowAction(_ sender: UIButton) {


        if (SKPaymentQueue.canMakePayments()) {
            let productID:NSSet = NSSet(array: [self.product_id as NSString]);
            let productsRequest:SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>);
            productsRequest.delegate = self;
            productsRequest.start();
            print("Fetching Products");
        } else {
            print("can't make purchases");
        }
    }

在“还原”按钮中

    // MARK: - Restore In App Purchase
        @IBAction func restoreAction(_ sender: UIButton) {

        if (SKPaymentQueue.canMakePayments()) {
            SKPaymentQueue.default().add(self)
            SKPaymentQueue.default().restoreCompletedTransactions()
        } else {
            // show error
        }

    }

添加代表：

    // SKProductRequest Delegate

    func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse) {

        print(response.products)
        let count : Int = response.products.count
        if (count>0) {

            let validProduct: SKProduct = response.products[0] as SKProduct
            if (validProduct.productIdentifier == self.product_id as String) {
                print(validProduct.localizedTitle)
                print(validProduct.localizedDescription)
                print(validProduct.price)
                self.buyProduct(product: validProduct)
            } else {
                print(validProduct.productIdentifier)
            }
        } else {
            print("nothing")
        }
    }

    func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
        for transaction:AnyObject in transactions {
            if let trans:SKPaymentTransaction = transaction as? SKPaymentTransaction{

                self.dismissPurchaseBtn.isEnabled = true
                self.restorePurchaseBtn.isEnabled = true
                self.buyNowBtn.isEnabled = true

                switch trans.transactionState {
                case .purchased:
                    print("Product Purchased")
                    //Do unlocking etc stuff here in case of new purchase
                    SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)

                    break;
                case .failed:
                    print("Purchased Failed");
                    SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
                    break;
                case .restored:
                    print("Already Purchased")
                    //Do unlocking etc stuff here in case of restor

                    SKPaymentQueue.default().finishTransaction(transaction as! SKPaymentTransaction)
                default:
                    break;
                }
            }
        }
    }


    //If an error occurs, the code will go to this function
        func paymentQueue(_ queue: SKPaymentQueue, restoreCompletedTransactionsFailedWithError error: Error) {
            // Show some alert
        }