在iOS应用启动时,可以通过添加一个SKPaymentQueue事务观察者来获取所有已购买的交易。以下是一个包含代码示例的解决方案:
首先,创建一个类来实现SKPaymentTransactionObserver协议,该协议用于监听交易状态的变化:
import StoreKit
class TransactionObserver: NSObject, SKPaymentTransactionObserver {
func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]) {
for transaction in transactions {
switch transaction.transactionState {
case .purchased:
// 处理已购买的交易
print("已购买的交易:\(transaction.payment.productIdentifier)")
case .restored:
// 处理已恢复的交易
print("已恢复的交易:\(transaction.payment.productIdentifier)")
case .failed:
// 处理交易失败
print("交易失败:\(transaction.error?.localizedDescription ?? "")")
case .deferred:
// 处理交易延迟
print("交易延迟:\(transaction.payment.productIdentifier)")
case .purchasing:
// 正在购买中
print("购买中:\(transaction.payment.productIdentifier)")
@unknown default:
break
}
}
}
}
接下来,在应用启动时添加事务观察者:
import UIKit
import StoreKit
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var transactionObserver: TransactionObserver?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// 创建事务观察者
transactionObserver = TransactionObserver()
// 添加事务观察者到支付队列
SKPaymentQueue.default().add(transactionObserver!)
return true
}
}
通过上述代码,当应用启动时,事务观察者将被添加到SKPaymentQueue中,并且可以在paymentQueue(_:updatedTransactions:)
方法中获取所有已购买的交易。