试图在 swift 中向类签名添加协议 [英] Trying to add a protocol to a Class signature in swift

问题描述

我正在尝试快速创建应用内购买.在我的班级签名中，我有以下内容:

I'm trying to create an in-app purchase in swift. In my class signature, I have the following:

class ViewController: UIViewController, UITextFieldDelegate, UIAlertViewDelegate,   
SKStoreProductViewControllerDelegate, SKPaymentTransactionObserver{

但是，我收到一条错误消息:类型ViewController"不符合协议:SKPaymentTransactionObserver

However, I get an error message: type "ViewController" does not conform to protocol: SKPaymentTransactionObserver

我读过这个:https://developer.apple.com/library/prerelease/mac/documentation/Swift/Conceptual/BuildingCocoaApps/WritingSwiftClassesWithObjective-CBehavior.html 和 符合 ViewController 中的协议，在 Swift 中

SKSoreProductViewControllerDelegate 工作正常.请问我遗漏了什么?

The SKSoreProductViewControllerDelegate works fine. What am I missing, please?

推荐答案

您是否在类中实现了所需的方法?

Have you implemented the required methods in your class?

paymentQueue:updatedTransactions: 和 paymentQueue:updatedDownloads: 是必需的方法，如果未实现，您将收到警告.

paymentQueue:updatedTransactions: and paymentQueue:updatedDownloads: are required methods and you will get a warning if they are not implemented.

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