我正在尝试在 Swift 应用中实现应用内购买，这是一种消耗品应用内购买，产品 ID 为 productID
研究
使用 this answer ，我了解了应用内购买的基本模式，并尝试对其进行调整，就像这样。我不需要使用 NSUserDefaults 方法让应用记住是否进行了购买，因为我正在使用不同的解决方案来处理它。
代码
class ViewController: UICollectionViewController, SKProductsRequestDelegate, SKPaymentTransactionObserver {
viewDidLoad() {
//Unimportant stuff left out
product_id = "productID"
SKPaymentQueue.defaultQueue().addTransactionObserver(self)
}
@IBAction func thisISTheButtonToTriggerTheInAppPurchases(sender: AnyObject) {
if (SKPaymentQueue.canMakePayments()) {
var productID:NSSet = NSSet(object: self.product_id!);
var productsRequest:SKProductsRequest = SKProductsRequest(productIdentifiers: productID as! Set<String>);
productsRequest.delegate = self;
productsRequest.start();
print("Fetching Products");
}else{
print("can't make purchases");
}
}
func buyProduct(product: SKProduct){
print("Sending the Payment Request to Apple");
var payment = SKPayment(product: product)
SKPaymentQueue.defaultQueue().addPayment(payment);
}
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)
break;
case .Failed:
print("Purchased Failed");
SKPaymentQueue.defaultQueue().finishTransaction(transaction as! SKPaymentTransaction)
break;
case .Restored:
print("Already Purchased");
SKPaymentQueue.defaultQueue().restoreCompletedTransactions()
default:
break;
}
}
}
}
}
错误
Type 'ViewController' does not conform to protocol 'SKPaymentTransactionObserver'
我稍微研究了一下这个错误，来源如 this提示此类错误是由于没有所需的功能。
According to Apple , paymentQueue:updatedTransactions: 是唯一需要的，但我似乎正在实现它。我的一个可能的理论是我没有正确实现它 - 如果是真的，我该如何解决？
预期行为
应用会呈现，如果用户输入有利，则执行 ID 为 productID 的 IAP。
感谢您的帮助，如果您需要更多信息，请告诉我!
最佳答案
非常简单。该错误与 SKPaymentTransactionObserver 有关。它只有required method是:
func paymentQueue(queue: SKPaymentQueue,
updatedTransactions transactions: [SKPaymentTransaction])
您的方法的签名不匹配:
func paymentQueue(queue: SKPaymentQueue!,
updatedTransactions transactions: [AnyObject]!)
...所以这不是同一种方法，所以你不符合。
关于swift - 不符合协议(protocol) SKPaymentTransactionObserver，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35515464/