ios - UILabel 未显示应用内购买标题

Question

我正在获取我的应用内购买 Title(我可以在 NSLog 中看到它)，但是显示标题的 UILabel 获取在 viewDidLoad 之后调用。有什么方法可以在 viewDidLoad 之前获取标题，以便 UILabel 显示标题？

下面是我的代码。如果您需要我发布更多信息，请告诉我，谢谢!

PurchaseViewController.h

@interface PurchaseViewController : UIViewController
<SKPaymentTransactionObserver, SKProductsRequestDelegate>

@property (strong, nonatomic) SKProduct *product;
@property (strong, nonatomic) NSString *productID;
@property (strong, nonatomic) IBOutlet UILabel *productTitle;
@property (strong, nonatomic) IBOutlet UIButton *buyButton;
@property (strong, nonatomic) IBOutlet UITextView *productDescription;
- (IBAction)buyProduct:(id)sender;
- (void)getProductInfo:(UIViewController *)viewController;

@property (nonatomic) int buttonNumber;

@end

PurchaseViewController.m

#pragma mark - SKProductsRequestDelegate
- (void) productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
    NSArray *products = response.products;
    if (products.count !=0) {
        _product = products[0];
        //_buyButton.enabled = YES;
        _productTitle.text = _product.localizedTitle;
        _productDescription.text = _product.localizedDescription;
    }
    else {
        _productTitle.text = @"Product not found";
    }

    products = response.invalidProductIdentifiers;

    for (SKProduct *product in products) {
        NSLog(@"Product not found: %@", product);
    }

}



- (IBAction)buyProduct:(id)sender {
    SKPayment *payment = [SKPayment paymentWithProduct:_product];
    [[SKPaymentQueue defaultQueue] addPayment:payment];
}

#pragma mark SKPaymentTransactionObserver

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
    for (SKPaymentTransaction *transaction in transactions) {
        switch (transaction.transactionState) {
            case SKPaymentTransactionStatePurchased:
                [self unlockFeature];
                [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
                break;

                case SKPaymentTransactionStateFailed:
                NSLog(@"Transaction Failed");
                [[SKPaymentQueue defaultQueue] finishTransaction:transaction];
                break;

            default:
                break;
        }
    }
}

Answer 1

通常的架构是在显示包含信息的 View 之前获取产品信息。然后在创建 View Controller 并显示其 View 时将该信息传递给 View Controller 。