使用StoreKit 2时订阅到期未收到交易更新的问题

我正在用StoreKit 2实现自动续订订阅，但订阅到期时收不到交易更新。需求是通过监听钩子更新用户已购产品，目前在Xcode里通过取消订阅并等待到期测试。

我用Transaction.updates监听交易更新，也参考了苹果官方内购实现示例。

监听交易更新的代码：

func listenForTransactions() -> Task<Void, Error> {
    return Task.detached {
        //Iterate through any transactions that don't come from a direct call to `purchase()`.
        for await result in Transaction.updates {
            do {
                let transaction = try self.checkVerified(result)
                
                //Deliver products to the user.
                await self.updateCustomerProductStatus()
                
                //Always finish a transaction.
                await transaction.finish()
            } catch {
                //StoreKit has a transaction that fails verification. Don't deliver content to the user.
                print("Transaction failed verification")
            }
        }
    }
}

更新已购订阅的代码：

@MainActor
func updateCustomerProductStatus() async {
    var purchasedProducts: [Product] = []
    
    // Iterate through all of the user's purchased products.
    for await result in Transaction.currentEntitlements {
        do {
            // Check whether the transaction is verified. If it isn’t, catch `failedVerification` error.
            let transaction = try checkVerified(result)
            
            // Check the `productType` of the transaction and get the corresponding product from the store.
            switch transaction.productType {
            case .autoRenewable:
                if let revocationDate = transaction.revocationDate {
                    //do nothing if transaction was revoked
                    print("Transaction was revoked on \(revocationDate)")
                    return
                } else if let expirationDate = transaction.expirationDate,
                            expirationDate < Date() {
                    // Do nothing, this subscription is expired.
                    return
                } else {
                    if let subscription = subscriptions.first(where: { $0.id == transaction.productID}) {
                        // Provide access to the product
                        purchasedProducts.append(subscription)
                    }
                }
            default:
                break
            }
        } catch {
            //storekit has a transaction that fails verification, don't delvier content to the user
            print("Failed - error retrieving products \(error)")
        }
    }
    //finally assign the purchased products
    self.purchasedSubscriptions = purchasedProducts
}

目前必须手动调用updateCustomerProductStatus()才能检查订阅是否到期，猜测订阅到期不被视为交易更新，想问有没有其他钩子可以监听订阅到期事件？

核心结论：订阅到期不会触发Transaction.updates事件 #

StoreKit 2中，Transaction.updates仅监听主动交易行为产生的更新，比如用户主动购买、续订、退款、退款式取消订阅等操作。订阅自然到期属于被动状态变更，不会触发这个流。

正确的到期状态处理方式 #

• 定期主动检查权益
  不需要依赖钩子，在这些时机主动调用updateCustomerProductStatus()：

  • App启动/从后台回到前台时
  • 用户进入需要订阅权限的页面时
  • 订阅到期前1-2小时触发提醒同步检查

• 监听App生命周期自动触发
  通过NotificationCenter监听前台激活事件，自动更新状态：

  func setupLifecycleListeners() {
      NotificationCenter.default.addObserver(
          self,
          selector: #selector(onAppEnterForeground),
          name: UIApplication.willEnterForegroundNotification,
          object: nil
      )
  }
  
  @objc func onAppEnterForeground() {
      Task { await updateCustomerProductStatus() }
  }
  

• 修复updateCustomerProductStatus()逻辑
  原代码遇到过期交易直接return会忽略后续有效订阅，改为跳过过期项继续检查：

  @MainActor
  func updateCustomerProductStatus() async {
      var purchasedProducts: [Product] = []
      
      for await result in Transaction.currentEntitlements {
          do {
              let transaction = try checkVerified(result)
              
              guard transaction.productType == .autoRenewable else { continue }
              
              if let revocationDate = transaction.revocationDate {
                  print("Transaction was revoked on \(revocationDate)")
                  continue
              }
              
              if let expirationDate = transaction.expirationDate, expirationDate < Date() {
                  print("Subscription \(transaction.productID) expired on \(expirationDate)")
                  continue
              }
              
              if let subscription = subscriptions.first(where: { $0.id == transaction.productID }) {
                  purchasedProducts.append(subscription)
              }
              
          } catch {
              print("Failed - error retrieving products \(error)")
          }
      }
      
      self.purchasedSubscriptions = purchasedProducts
  }
  

• 服务器端验证（推荐）
  利用App Store Server API定期拉取用户订阅状态，服务器可以主动获取到期信息，下次用户打开App时同步最新状态，避免完全依赖客户端检查。

测试技巧 #

在Xcode测试时，可使用App Store Connect的沙盒订阅加速功能，将到期时间缩短至分钟级，无需等待自然到期。

内容的提问来源于stack exchange，提问作者smartinrubio