iap支付总结（一次性消费购买）

一、支付流程 ： 

        1.向服务器发起请求获取订单号 

        2.向苹果服务器获取对应的产品信息

        3.发起购买请求（通过设置applicationUsername使订单号与这次交易绑定）

        4.处理SKPaymentTransactionObserver回调方法，交易完成向服务器发送购买凭据

二、部分代码实现：

#pragma mark - SKProductsRequestDelegate

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response{

    TLog(@"--------------收到产品反馈消息---------------------");

    NSArray * products = response.products;

    if([products count] == 0){

        TLog(@"--------------没有商品------------------");

        return;

    }

    SKMutablePayment *payment = [SKMutablePayment paymentWithProduct:product];

    payment.applicationUsername = self.orderId;

    [[SKPaymentQueue defaultQueue] addPayment:payment];

    TLog(@"发送购买请求");

}

#pragma mark - SKPaymentTransactionObserver

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(nonnull NSArray<SKPaymentTransaction *> *)transactions

{

    for(SKPaymentTransaction *transaction in transactions){

        

        switch (transaction.transactionState) {

            case SKPaymentTransactionStatePurchasing:

                TLog(@"交易中");

                break;

            case SKPaymentTransactionStatePurchased:{

                TLog(@"购买完成(销毁交易)");

                [self succeedTransaction:transaction];

            }

                break;

            case SKPaymentTransactionStateRestored:{

                TLog(@"恢复购买(销毁交易)");

                [[SKPaymentQueue defaultQueue] finishTransaction:transaction];

            }

                break;

            case SKPaymentTransactionStateFailed:{

                TLog(@"购买失败(销毁交易)");

                [self failedTransaction:transaction];

            }

                break;

            case SKPaymentTransactionStateDeferred:{

                TLog(@"最终状态未确定");

                [[SKPaymentQueue defaultQueue] finishTransaction:transaction];

            }

                break;

            default:

                break;

        }

    }

}

- (void)succeedTransaction:(SKPaymentTransaction *)transaction{

    // appStoreReceiptURL iOS7.0增加的，购买交易完成后，会将凭据存放在该地址

    NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];

    // 从沙盒中获取到购买凭据

    NSData *receipt = [NSData dataWithContentsOfURL:receiptURL];

    

    NSString * receiptStr =  [receipt base64EncodedStringWithOptions:0];

    if ([receiptStr length] > 0) {

        WEAKSELF

       [API uploadRechargeOrder:transaction.payment.applicationUsername receipt:receiptStr Success:^(id data) {

           STRONG_SELF

           [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

       } exception:^(RequestException *e) {

           STRONG_SELF

       }];

    }

}

- (void)failedTransaction:(SKPaymentTransaction *)transaction {

    if(transaction.error.code != SKErrorPaymentCancelled) {

    } else {

    }

    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

}

对于上传失败的交易在下次APP启动后回调SKPaymentTransactionObserver代理方法

- (void)checkSKPaymentQueue{

    [self paymentQueue:[SKPaymentQueue defaultQueue] updatedTransactions:[SKPaymentQueue defaultQueue].transactions];

}