[iOS]苹果内购的踩坑

1，TransactionState

SKPaymentTransactionStatePurchased（完成）
SKPaymentTransactionStateRestored（已付费）
SKPaymentTransactionStateFailed（失败）
SKPaymentTransactionStatePurchasing（添加商品到列表）
在状态显示为完成、已付费、失败的情况时，需要调用系统API
[[SKPaymentQueue defaultQueue] finishTransaction:tran]
来终结订单状态。

2. 卡单，提示已购买将免费恢复

在Appdelegate中didFinishLaunchingWithOptions添加监听[[SKPaymentQueue defaultQueue] addTransactionObserver:self];实现监听方法

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray<SKPaymentTransaction *> *)transactions{
    for (SKPaymentTransaction *transaction in transactions) {
        switch (transaction.transactionState) {
            case SKPaymentTransactionStatePurchased: {
                //交易完成
                if ([SKPaymentQueue defaultQueue]) {
                    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
                }
            }
                break;
            case SKPaymentTransactionStateFailed: {
                //交易失败
                if ([SKPaymentQueue defaultQueue]) {
                    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
                }
            }
                break;
            case SKPaymentTransactionStateRestored: {
                //付费
                if ([SKPaymentQueue defaultQueue]) {
                    [[SKPaymentQueue defaultQueue] finishTransaction: transaction];
                }
            }
                break;
            case SKPaymentTransactionStatePurchasing:
                //商品添加进列表
                break;
            default:
                break;
        }
    }
}