Ha-ii，我正在我的应用程序中进行应用内购买，当应用内内容购买成功时我需要禁用一个按钮，所以我将 NSuserdefault 放入我的代码中以确定是否成功，但是NSUserDefault仅在我刷新页面时有效，当内容成功消息出现时我没有启用按钮，当我返回另一个页面并返回时我被启用，我需要通过通知将实例消息传递给viewcontroller .我的代码是
- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {
for(SKPaymentTransaction *transaction in transactions) {
switch (transaction.transactionState) {
case SKPaymentTransactionStatePurchasing:
// Item is still in the process of being purchased
break;
case SKPaymentTransactionStatePurchased:
// Item was successfully purchased!
// --- UNLOCK FEATURE OR DOWNLOAD CONTENT HERE ---
// The purchased item ID is accessible via
// transaction.payment.productIdentifier
// After customer has successfully received purchased content,
// remove the finished transaction from the payment queue.
[[SKPaymentQueue defaultQueue] finishTransaction: transaction];
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"Transsucess"];
break;
case SKPaymentTransactionStateRestored:
// Verified that user has already paid for this item.
// Ideal for restoring item across all devices of this customer.
// --- UNLOCK FEATURE OR DOWNLOAD CONTENT HERE ---
// The purchased item ID is accessible via
// transaction.payment.productIdentifier
// After customer has restored purchased content on this device,
// remove the finished transaction from the payment queue.
[[SKPaymentQueue defaultQueue] finishTransaction: transaction];
break;
case SKPaymentTransactionStateFailed:
// Purchase was either cancelled by user or an error occurred.
if (transaction.error.code != SKErrorPaymentCancelled) {
// A transaction error occurred, so notify user.
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"Transsucess"];
}
// Finished transactions should be removed from the payment queue.
[[SKPaymentQueue defaultQueue] finishTransaction:
transaction];
break;
}
}
}
在我的 anothervierwcontroller 中，我想传递 Nsuserdefault 值的 Notification 值。 如何做到这一点。请帮助我。
最佳答案
在您的第一个 View vieDidLoad 中添加行 ..
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(ContentPurchased) name:@"Purchased" object:nil];
(在 dealloc 中移除观察者)
然后当您在问题代码中购买成功时.. 发布通知
[[NSNotificationCenter defaultCenter] postNotificationName:@"Purchased" object:nil userInfo:nil];
您可以传递对象..但我相信您应该将购买交易详细信息存储在NSUserdefautls..因为下次运行应用程序时需要它..
当您发布时，通知 ContentPurchased 方法在第一个 View 中被调用(您必须在 View Controller 中添加它)
关于iphone - 如何通过 NSNotification 将消息从一个类传递到另一个类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9613407/