如果Apple託管的應用內購買內容下載失敗，該怎麼辦？

Question

有時候，下載失敗，我的應用程序在失敗時完成交易，正如隨處推薦的。但是，如果我完成了交易，則Store Kit無法恢復失敗的下載。而且，似乎Store Kit在下載失敗後不會自動重試下載內容，而且似乎也無法觸發下載。

有人想出了在這種情況下做什麼？違反所有建議，並且在內容完全下載並安裝之前未完成交易？

或者我必須以編程方式恢復事務並忽略所有其他產品標識符？

Answer 1

您可以在您的應用程序通過這種方式添加恢復購買的按鈕： -

//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]; 

希望這有助於你......！