检查用户是否取消了SKPaymentTransaction

Question

如何检查用户是否点击了取消按钮（当他被问及是否要购买smth时，或者如果他已经购买了这个SKProduct是否要下载它）？

目前，我只收到 SKPaymentTransactionStateFailed in paymentQueue：updateTransactions： 方法，无论是在用户点击取消按钮后还是在没有互联网时。有什么方法可以区分这两种情况吗？

Answer 1

这段代码对我有用：

if (transaction.error.code != SKErrorPaymentCancelled) {
    NSLog(@"Other error");
} else {
    NSLog(@"User canceled");
}

Answer 2

艾伦的回答是完美的。以防万一有人想知道其他情况

switch (transaction.error.code) {
   case SKErrorUnknown:
       //Unknown error
       break;
   case SKErrorClientInvalid:
       // client is not allowed to issue the request, etc.
       break;
   case SKErrorPaymentCancelled:
       // user cancelled the request, etc.
       break;
   case SKErrorPaymentInvalid:
       // purchase identifier was invalid, etc.
       break;
   case SKErrorPaymentNotAllowed:
       // this device is not allowed to make the payment
       break;
   default:
       break;
}

Answer 3

Swift 版本：

if let error = transaction.error as? NSError {
    if error.domain == SKErrorDomain {
        // handle all possible errors
        switch (error.code) {
        case SKError.unknown.rawValue:
            print("Unknown error")
        case SKError.clientInvalid.rawValue:
            print("client is not allowed to issue the request")
        case SKError.paymentCancelled.rawValue:
            print("user cancelled the request")
        case SKError.paymentInvalid.rawValue:
            print("purchase identifier was invalid")
        case SKError.paymentNotAllowed.rawValue:
            print("this device is not allowed to make the payment")
        default:
            break;
        }
    }
}

Answer 4

Swift 4.2

if let error = transaction.error,
 (error as? SKError)?.code != SKError.paymentCancelled {
 // Here it is failed for sure!
}

Answer 5

Swift 2.2

如果您得到.Failed响应 paymentQueue ，最好尽可能处理所有错误。

if let error = transaction.error {
    if error.domain == SKErrorDomain {
        // handle all possible errors
        switch (error.code) {
        case SKErrorCode.Unknown.rawValue:
            print("Unknown error")
            break;
        case SKErrorCode.ClientInvalid.rawValue:
            print("client is not allowed to issue the request")
            break;
        case SKErrorCode.PaymentCancelled.rawValue:
            print("user cancelled the request")
            break;
        case SKErrorCode.PaymentInvalid.rawValue:
            print("purchase identifier was invalid")
            break;
        case SKErrorCode.PaymentNotAllowed.rawValue:
            print("this device is not allowed to make the payment")
            break;
        default:
            break;
        }
    }
}

Answer 6

检查设置的 SKPaymentTransaction error 属性。

@property（非原子，只读）NSError *错误

描述处理事务时发生的错误的对象。（只读）

error 属性是未定义的，除非 transactionState 设置为 SKPaymentTransactionStateFailed。应用程序可以读取 error 属性以确定事务失败的原因。

此外，您可能希望在启动事务之前使用 Apple 的可达性类来确定互联网是否可用。

Answer 7

也许您正在使用Ray Wunderlich的教程代码进行应用内购买。法典说：

- (id)initWithProductIdentifiers:(NSSet *)productIdentifiers {
if ((self = [super init])) {
    // Store product identifiers
    _productIdentifiers = productIdentifiers;
    // Check for previously purchased products
    _purchasedProductIdentifiers = [NSMutableSet set];
    for (NSString * productIdentifier in _productIdentifiers) {
        BOOL productPurchased = [[NSUserDefaults standardUserDefaults] boolForKey:productIdentifier];
        if (productPurchased) {
            [[SKPaymentQueue defaultQueue] addTransactionObserver:self]; // CHECK THIS
            [_purchasedProductIdentifiers addObject:productIdentifier];
            NSLog(@"Previously purchased: %@", productIdentifier);
        } else {
            NSLog(@"Not purchased: %@", productIdentifier);
        }
    }

在那里你可以看到，addTransactionObserver 只有在产品已经被处理的情况下才会被调用。如果将这行代码移到 if 查询前面，您将获得所需的结果。

[[SKPaymentQueue defaultQueue] addTransactionObserver:self]; // MOVE HERE
if (productPurchased) {
    [_purchasedProductIdentifiers addObject:productIdentifier];
    NSLog(@"Previously purchased: %@", productIdentifier);
} else {
    NSLog(@"Not purchased: %@", productIdentifier);
}                

在失败的事务方法中，现在可以调用

 [[NSNotificationCenter defaultCenter] postNotificationName:IAPHelperProductPurchasedNotification object:nil userInfo:nil];

现在，您可以在当前视图中检查通知发送的nil值