IAP监听购买结果paymentQueue,SKPaymentTransaction方法重复累计调用解决

最近在做IAP的时候无意发现以前写的内购代码有个小漏洞，收到内购的结果处理会根据购买次数而相应的增加，实现消息监听的初始化和结果监听代码处理如下：

 

 

- (id)initWithPayConstructor:(NSString *) productIdStr
{
    self = [super init];
    if (self) {
        // Custom initialization
        [self initProductId:productIdStr];
        // 监听购买结果
        [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
    }
    return self;
}

 

 

 

//监听购买结果
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transaction{
    for(SKPaymentTransaction *tran in transaction){

        switch (tran.transactionState) {
            case SKPaymentTransactionStatePurchased:
                {
                    NSLog(@"交易完成");
                    [self completeTransaction:tran];
                    CCHelp* cppHelper = GetCCHelp();
                    cppHelper->purchaseResult(1);

                    [[SKPaymentQueue defaultQueue] finishTransaction:tran];
                }
                break;
            case SKPaymentTransactionStatePurchasing:
                {
                    NSLog(@"商品添加进列表");
                }
                break;
            case SKPaymentTransactionStateRestored:
                {
                    NSLog(@"已经购买过商品");
                    [self restoreTransaction:tran];

                    [[SKPaymentQueue defaultQueue] finishTransaction:tran];
                }
                break;
            case SKPaymentTransactionStateFailed:
                {
                    NSLog(@"交易失败");
                    [self failedTransaction:tran];
                    CCHelp* cppHelper = GetCCHelp();
                    cppHelper->purchaseResult(4);

                    [[SKPaymentQueue defaultQueue] finishTransaction:tran];
                }
                break;
            default:
                {
                    CCHelp* cppHelper = GetCCHelp();
                    cppHelper->purchaseResult(5);

                    [[SKPaymentQueue defaultQueue] finishTransaction:tran];
                }
                break;
        }
    }
}

原因：每次购买都会重复添加transaction的消息监听，所以结果返回会重复调用。

 

解决方案1修改如下：加判断处理

 

static bool hasAddObersver = NO;

- (id)initWithPayConstructor:(NSString *) productIdStr
{
    self = [super init];
    if (self) {
        // Custom initialization
        [self initProductId:productIdStr];

        if (!hasAddObersver) {
            hasAddObersver = YES;
            // 监听购买结果
            [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
        }
    }
    return self;
}