iphone - 即使使用 ARC，SKProductsRequest 仍被释放？

Question

我正在尝试设置 SKProductsRequest，但不断收到错误 EXC_BAD_ACCESS。我知道这与 ARC 有关。在我的 .h 文件中，我有 SKProductsRequestDelegate。

这些是我的 .m 文件中的主要函数:

- (void)requestProUpgradeProductData {
    NSSet *productIdentifiers = [NSSet setWithObject:kInAppPurchaseProUpgradeProductId];
    productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
    productsRequest.delegate = self;
    [productsRequest start];
}

#pragma mark -
#pragma mark SKProductsRequestDelegate methods

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
    NSArray *products = response.products;
    //proUpgradeProduct = [products count] == 1 ? [products firstObject] : nil;
    proUpgradeProduct = [products objectAtIndex:0];
    if (proUpgradeProduct) {
        NSLog(@"Product title: %@" , proUpgradeProduct.localizedTitle);
        NSLog(@"Product description: %@" , proUpgradeProduct.localizedDescription);
        NSLog(@"Product price: %@" , proUpgradeProduct.price);
        NSLog(@"Product id: %@" , proUpgradeProduct.productIdentifier);
    }

    for (NSString *invalidProductId in response.invalidProductIdentifiers) {
        NSLog(@"Invalid product id: %@" , invalidProductId);
    }

    // finally release the reqest we alloc/init’ed in requestProUpgradeProductData
    productsRequest = nil;

    [self purchaseProUpgrade];

    [[NSNotificationCenter defaultCenter] postNotificationName:kInAppPurchaseManagerProductsFetchedNotification object:self userInfo:nil];
}

当我启用 NSZombieEnabled 时，我得到的是:"-[InAppPurchaseManager respondsToSelector:]: 消息发送到已释放的实例。"

任何帮助将不胜感激。谢谢!

Answer 1

我终于明白了!关键是当你综合变量时，一定要这样做:

@synthesize productsRequest = _productsRequest;

在 .h 中，它应该如下所示:

@property (nonatomic, strong) SKProductsRequest *productsRequest;

在 .m 中，请确保使用“self”。使用产品时请求:

self.productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
self.productsRequest.delegate = self;
[self.productsRequest start];

给你!