IOS应用程式内购买收据

Question

IOS应用程式内购买如何知道这个产品已经购买（我可以nsuserdefault检查这个地方，但如何从手机中取出应用程序后，知道再重新安装应用程序）

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

Answer 1

您可以收到以这种方式（从 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. */ } 

如果用户删除的应用程序，你必须提供一种方法来恢复购买。

你可以做这样的事情：

- (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); 
    } 
}