如果Apple托管的应用内购买内容下载失败，该怎么办？

Question

有时候，下载失败，我的应用程序在失败时完成交易，正如随处推荐的。但是，如果我完成了交易，则Store Kit无法恢复失败的下载。而且，似乎Store Kit在下载失败后不会自动重试下载内容，而且似乎也无法触发下载。

有人想出了在这种情况下做什么？违反所有建议，并且在内容完全下载并安装之前未完成交易？

或者我必须以编程方式恢复事务并忽略所有其他产品标识符？

Answer 1

您可以在您的应用程序通过这种方式添加恢复购买的按钮： -

//inside of an IBaction 
[[SKPaymentQueue defaultQueue] addTransactionObserver:self]; 
[[SKPaymentQueue defaultQueue]restoreCompletedTransactions]; 


// Then this is called 
- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue { 
NSLog(@"%@",queue); 
NSLog(@"Restored Transactions are once again in Queue for purchasing %@",[queue transactions]); 

NSMutableArray *purchasedItemIDs = [[NSMutableArray alloc] init]; 
NSLog(@"received restored transactions: %i", queue.transactions.count); 

for (SKPaymentTransaction *transaction in queue.transactions) { 
    NSString *productID = transaction.payment.productIdentifier; 
    [purchasedItemIDs addObject:productID]; 
    NSLog (@"product id is %@" , productID); 
    // here put an if/then statement to write files based on previously purchased items 
    // example if ([productID isEqualToString: @"youruniqueproductidentifier]){write files} else { nslog sorry} 
    } 
} 

OR

[[SKPaymentQueue defaultQueue] restoreCompletedTransactions]; 

希望这有助于你......！