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自2天以来，我一直在努力解决这个问题。我已经使用可下载的内容成功实现了应用内购买。但是每当我删除应用程序并恢复购买时，恢复实际上并没有下载内容。但是，如果我在 restoreTransaction 中添加下载代码，每次我删除应用程序并重新安装它时，它都不会调用导致应用程序行为异常的完成事务（这是合理的）。任何帮助表示赞赏！如果有人需要进一步解释，请告诉我。谢谢！！

    - (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
  {
   for (SKPaymentTransaction * transaction in transactions) {
    switch (transaction.transactionState)
    {
        case SKPaymentTransactionStatePurchased:

            if(transaction.downloads)
                [self download:transaction];
            else

               [self completeTransaction:transaction];

            break;

        case SKPaymentTransactionStateFailed:

            [self failedTransaction:transaction];
            break;

        case SKPaymentTransactionStateRestored:

            if(transaction.downloads)
               [self restoreDownload:transaction];
            else
               [self restoreTransaction:transaction];

        default:
            break;
    }
};
}


 -(void)paymentQueue:(SKPaymentQueue *)queue updatedDownloads:(NSArray *)downloads
{
 for (SKDownload *download in downloads)
  {
    switch (download.downloadState) {

        case SKDownloadStateActive:
            NSLog(@"Download progress = %f",
                  download.progress);
            NSLog(@"Download time = %f",
                  download.timeRemaining);
            break;
        case SKDownloadStateFinished:
        {

           NSLog(@"URL %@",download.contentURL);
          }

            break;
        default:
            break;
        }
    }
}


 - (void)completeTransaction:(SKPaymentTransaction *)transaction {
  NSLog(@"completeTransaction...");

  [self provideContentForProductIdentifier:transaction.payment.productIdentifier];

  [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
   }


   - (void)restoreTransaction:(SKPaymentTransaction *)transaction {
      NSLog(@"restoreTransaction...");


   [self  provideContentForProductIdentifier:transaction.originalTransaction.payment.productIdentifier];

    [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
   }

 - (void)restoreDownload:(SKPaymentTransaction *)transaction {
 NSLog(@"restoreDownload...");

  //[self validateReceiptForTransaction:transaction];
   [self provideContentForProductIdentifier:transaction.originalTransaction.payment.productIdentifier];

   [[SKPaymentQueue defaultQueue] startDownloads:transaction.downloads];

  }

 - (void)download:(SKPaymentTransaction *)transaction {
NSLog(@"Download Content...");

[self provideContentForProductIdentifier:transaction.payment.productIdentifier];
[[SKPaymentQueue defaultQueue] startDownloads:transaction.downloads];
//[[SKPaymentQueue defaultQueue] finishTransaction:transaction];

}
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