ios 内购

从开发iOS到现在，内购app也做过两个了，现在好好记录下这个流程。

首先需要在所属的app下创建物品，这个流程网上很多也不难。这边就详细说明了，可参考下面网址。
http://blog.csdn.net/shenjie12345678/article/details/40978977/

我们定义好一个或多个product 后 每个product id对应着一个product。 我们拿到一个或多个product id，数据处理后对appstore 发起购物请求，等待appstore处理后的响应(之间很多操作，都是appStore和用户之间，客户端无法干预), 客户端对购物成功的回执单进行校验。

内购流程示意图.png

这个流程基本就是这样，如上图所示。

理清整个流程后，我们对内购就非常清晰了，要注意的就是细节了，对各种异常情况的处理。各种case 见下列枚举，基本和app的sdk保持一致

typedef enum : NSUInteger {
    EPaymentTransactionStateNoPaymentPermission, //没有Payment权限
    EPaymentTransactionStateAddPaymentFailed, //addPayment失败
    EPaymentTransactionStatePurchasing,//正在购买
    EPaymentTransactionStatePurchased,//购买完成(销毁交易)
    EPaymentTransactionStateFailed, //购买失败(销毁交易)
    EPaymentTransactionStateCancel,//用户取消
    EPaymentTransactionStateRestored,//恢复购买(销毁交易)
    EPaymentTransactionStateDeferred, //最终状态未确定
} EPaymentTransactionState;

内购有个重要的协议 SKPaymentTransactionObserver
需要特殊特殊处理，不多说废话 直接附上代码

#pragma mark - SKPaymentTransactionObserver
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray<SKPaymentTransaction *> *)transactions
{
    for (SKPaymentTransaction *transaction in transactions)
    {
        EPaymentTransactionState state;
        switch (transaction.transactionState){
            case SKPaymentTransactionStatePurchasing:
            {
                // 连接appStore
                state = EPaymentTransactionStatePurchasing;
            }
                break;
            case SKPaymentTransactionStatePurchased:
            {
                state = EPaymentTransactionStatePurchased;
                //交易完成
                if (isServiceVerify) {
                    [self completeTransaction:transaction];
                }
                else
                {
                    //本地作校验
                    [self verifyPurchase:transaction];
                }
            }
                break;
                
            case SKPaymentTransactionStateFailed:
            {
                //交易失败
                if (transaction.error.code != SKErrorPaymentCancelled)
                {
                    state = EPaymentTransactionStateFailed;
                }else
                {
                    state = EPaymentTransactionStateCancel;
                }

                [self finshTransaction:transaction];
            }
                break;
                
            case SKPaymentTransactionStateRestored:
            {
                state = EPaymentTransactionStateRestored;
                //已经购买过该商品
        
                [self finshTransaction:transaction];
            }
                break;
            case SKPaymentTransactionStateDeferred:
            {
                state = EPaymentTransactionStateDeferred;
            }
                break;
            default:
                break;
        }
        if (self.delegate && [self.delegate respondsToSelector:@selector(updatedTransactions:)]) {
            [self.delegate updatedTransactions:state];
        }

    }
}

补充一点 ：一旦启动了开始购买流程，必须要调用

    //结束交易
    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];

来结束购买流程，否者在下一次调用到 方法

[[SKPaymentQueue defaultQueue] addTransactionObserver:self];

还是会触发继续购买流程，这个特性可以解决购买过程中出现的各种异常场景，比如购买完成app crash（没网络了），在下一次启动app时调用上面的方法可以回复购买。
具体类 放在gitHub下
https://github.com/weskhen/InAppPurchasing

贴上一段苹果本地校验成功的json返回 估计服务器也是相同的

Printing description of jsonResponse:
{
    environment = Sandbox; //购买环境 
    receipt =     {
        "adam_id" = 0;
        "app_item_id" = 0;
        "application_version" = 30;
        "bundle_id" = "com.wesk.PaoBa";
        "download_id" = 0;
        "in_app" =         (
                        {
                "is_trial_period" = false;
                "original_purchase_date" = "2016-09-27 04:52:58 Etc/GMT";
                "original_purchase_date_ms" = 1474951978000;
                "original_purchase_date_pst" = "2016-09-26 21:52:58 America/Los_Angeles";
                "original_transaction_id" = 1000000238538249;
                "product_id" = “com.PaoBa.Product.001";
                "purchase_date" = "2016-09-27 04:52:58 Etc/GMT";
                "purchase_date_ms" = 1474951978000;
                "purchase_date_pst" = "2016-09-26 21:52:58 America/Los_Angeles";
                quantity = 1;
                "transaction_id" = 1000000238538249;
            }
        );
        "original_application_version" = "1.0";
        "original_purchase_date" = "2013-08-01 07:00:00 Etc/GMT";
        "original_purchase_date_ms" = 1375340400000;
        "original_purchase_date_pst" = "2013-08-01 00:00:00 America/Los_Angeles";
        "receipt_creation_date" = "2016-09-27 07:42:18 Etc/GMT";
        "receipt_creation_date_ms" = 1474962138000;
        "receipt_creation_date_pst" = "2016-09-27 00:42:18 America/Los_Angeles";
        "receipt_type" = ProductionSandbox;
        "request_date" = "2016-09-27 07:43:44 Etc/GMT";
        "request_date_ms" = 1474962224281;
        "request_date_pst" = "2016-09-27 00:43:44 America/Los_Angeles";
        "version_external_identifier" = 0;
    };
    status = 0;
}

苹果反馈的状态码；

21000 App Store无法读取你提供的JSON数据
21002 收据数据不符合格式 （踩过坑，越狱机会出现）
21003 收据无法被验证
21004 你提供的共享密钥和账户的共享密钥不一致
21005 收据服务器当前不可用
21006 收据是有效的，但订阅服务已经过期。当收到这个信息时，解码后的收据信息也包含在返回内容中
21007 收据信息是测试用（sandbox），但却被发送到产品环境中验证
21008 收据信息是产品环境中使用，但却被发送到测试环境中验证