如何知道 iOS 应用程序提供试用版
How to know that trial is available in iOS app
我们的应用程序中有 "try for free" 按钮。我想知道如何知道可以试用。
我对文档中的文本有点怀疑：
New and resubscribing customers are eligible to pay one discounted price or free trial per subscription group.
什么是"resubscribing"？过去订阅过的客户可以再次试用吗？
是否可以使用 StoreKit 确定现在可以试用？
检查 SKProduct 的 introductoryPrice 属性 是否正确：https://developer.apple.com/documentation/storekit/skproduct/2936878-introductoryprice?
我还想向后端询问当前用户的所有订阅历史记录，并在用户尚未试用时显示 "try for free"。但正如我所说，我不确定 "resubscribing".
检查试用资格的正确方法是按照以下 Apple 所述验证收据文件。由于大多数人会认为这是一个 non-critical 验证，因此 client-side 这样做并没有太大的危害，而不是关闭服务器以节省网络调用。假收据可能造成的最严重危害是更改按钮的文本。
Determine Eligibility
To determine if a user is eligible for an introductory price, check
their receipt: Validate the receipt as described in Validating
Receipts With the App Store. In the receipt, check the values of the
Subscription Trial Period and the Subscription Introductory Price
Period for all in-app purchase transactions. If either of these fields
are true for a given subscription, the user is not eligible for an
introductory price on that subscription product or any other products
within the same subscription group. You typically check the user's
eligibility from your server. It's best to determine eligibility
early—for example, on the first launch of the app, if possible.
Based on the receipt, you will find that new and returning customers
are eligible for introductory price or free trial discounts as
follows: New subscribers are always eligible. Lapsed subscribers who
renew are eligible if they haven't previously received an introductory
price for the given product (or any product within the same
subscription group).
回答您的具体问题：
Can customers who has subscription in the past have trial again?
没有。 Apple 对同一订阅组 中的 任何产品强制执行此操作。例如，如果用户开始试用 "Monthly Product"，取消，然后购买 "Yearly Product"，他们将没有资格获得免费试用。
Is it possible to use StoreKit to figure out that trial is available
now? Is it correct to check introductoryPrice property of the
SKProduct?
没有。 SKProduct 将始终显示相同的促销价。
我们的应用程序中有 "try for free" 按钮。我想知道如何知道可以试用。
我对文档中的文本有点怀疑：
New and resubscribing customers are eligible to pay one discounted price or free trial per subscription group.
什么是"resubscribing"？过去订阅过的客户可以再次试用吗？
是否可以使用 StoreKit 确定现在可以试用？
检查 SKProduct 的 introductoryPrice 属性 是否正确：https://developer.apple.com/documentation/storekit/skproduct/2936878-introductoryprice?
我还想向后端询问当前用户的所有订阅历史记录，并在用户尚未试用时显示 "try for free"。但正如我所说，我不确定 "resubscribing".
检查试用资格的正确方法是按照以下 Apple 所述验证收据文件。由于大多数人会认为这是一个 non-critical 验证，因此 client-side 这样做并没有太大的危害，而不是关闭服务器以节省网络调用。假收据可能造成的最严重危害是更改按钮的文本。
Determine Eligibility
To determine if a user is eligible for an introductory price, check their receipt: Validate the receipt as described in Validating Receipts With the App Store. In the receipt, check the values of the Subscription Trial Period and the Subscription Introductory Price Period for all in-app purchase transactions. If either of these fields are true for a given subscription, the user is not eligible for an introductory price on that subscription product or any other products within the same subscription group. You typically check the user's eligibility from your server. It's best to determine eligibility early—for example, on the first launch of the app, if possible.
Based on the receipt, you will find that new and returning customers are eligible for introductory price or free trial discounts as follows: New subscribers are always eligible. Lapsed subscribers who renew are eligible if they haven't previously received an introductory price for the given product (or any product within the same subscription group).
回答您的具体问题：
Can customers who has subscription in the past have trial again?
没有。 Apple 对同一订阅组 中的 任何产品强制执行此操作。例如，如果用户开始试用 "Monthly Product"，取消，然后购买 "Yearly Product"，他们将没有资格获得免费试用。
Is it possible to use StoreKit to figure out that trial is available now? Is it correct to check introductoryPrice property of the SKProduct?
没有。 SKProduct 将始终显示相同的促销价。