IOS應用程式內購買收據

Question

IOS應用程式內購買如何知道這個產品已經購買（我可以nsuserdefault檢查這個地方，但如何從手機中取出應用程序後，知道再重新安裝應用程序）

https://developer.apple.com/library/ios/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateRemotely.html#//apple_ref/doc/uid/TP40010573-CH104-SW1

Answer 1

您可以收到以這種方式（從 Read the Receipt Data）：

// Load the receipt from the app bundle. 
NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL]; 
NSData *receipt = [NSData dataWithContentsOfURL:receiptURL]; 
if (!receipt) { /* No local receipt -- handle the error. */ } 

如果用戶刪除的應用程序，你必須提供一種方法來恢復購買。

你可以做這樣的事情：

- (IBAction)restorePurchase:(id)sender{ 
    [[SKPaymentQueue defaultQueue] addTransactionObserver:self]; 
    [[SKPaymentQueue defaultQueue] restoreCompletedTransactions]; 
} 

// Then this is called 
- (void)paymentQueueRestoreCompletedTransactionsFinished:(SKPaymentQueue *)queue { 

    NSMutableArray *purchasedItemIDs = [[NSMutableArray alloc] init]; 

    for (SKPaymentTransaction *transaction in queue.transactions) { 
     NSString *productID = transaction.payment.productIdentifier; 
     [purchasedItemIDs addObject:productID]; 
     NSLog(@"product id is %@", productID); 
    } 
}