Question

我正在实施应用内购买功能。除Apple Store标准购买流程外，我还从我自己的服务器端进行了另一次收据验证。有时，购买程序在Apple端完成，应用程序在我的服务器验证收据之前就已存在。

所以我将收据存储在NSUserDefaults中。每当applicationDidBecomeActive，我会检查NSUserDefaults中是否有待处理的收据。如果是，我想弹出警报，询问用户是否继续完成购买。如果用户取消，那么我会取消收据取消购买。否则，我会将用户引导到购买视图，并完成剩下的工作。

以前，我在AppDelegate ApplicationDidBecomeActive内进行了检查。这似乎不是一个好习惯。然后我尝试将代码移动到MainViewController中，在init中捕获AppicationDidBecomeActive通知。但我不确定这样做的正确方法是什么？我尝试用selector:@selector(resumePurchase:)捕捉事件，这是我的简历购买代码

- (void)resumePurchase:(NSNotification*)notification {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSData *purchaseDocument = (NSData*)[userDefaults objectForKey:@"lastPurchaseDocument"];
    if (!purchaseDocument) {
        NSString *message = [NSString stringWithFormat:NSLocalizedString(@"You have an incomplete purchase in the app, do you want to continue the payment?",@"resume purchase.")];
        self.resumePurchaseAlert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Resume Payment",@"alter title")
                                                              message:message
                                                             delegate:self
                                                    cancelButtonTitle:NSLocalizedString(@"Cancel",@"Cancel caption")
                                                    otherButtonTitles:NSLocalizedString(@"Continue",@"altert approve button"), nil];
        [self.resumePurchaseAlert show];
    }
}

到目前为止这似乎没问题。我被困在继续按钮处理程序

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (alertView == self.resumePurchaseAlert) {
        if (buttonIndex == 0) { // Cancel
            NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
            [userDefaults removeObjectForKey:kPurchaseDocument];
            [userDefaults synchronize];
        }
        if (buttonIndex == 1) { // Continue
            NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
            NSDictionary *purchaseDocument = (NSDictionary*)[userDefaults objectForKey:kPurchaseDocument];
            NSData *purchasedReceipt = [purchaseDocument objectForKey:kPurchasedReceipt];
            NSString *purchasedFeature = [purchaseDocument objectForKey:kPurchasedFeature];
            if (purchasedFeature && purchasedReceipt) {
                // here I want to redirect the view to PurchaseViewController
            }
        }
    }
}

我不知道如何以优雅的方式将视图重定向到PurchaseViewController ......

Answer 1

在UIViewController中保存的其他NSUserDefaults检查值，并根据它进行了nabvigation。

如果用户选择继续，则在ApplicationDidBecomeActive时显示警报并重定向到另一个视图

1 个答案: