跟踪应用内购买和多设备（iOS）
我想在我的应用程序中实现应用内购买。我将使用内置产品模型，其中 IAP 将解锁代码中的功能。我的问题是：
如何跟踪设备上的购买情况（以解锁该功能）？ NS用户默认值？该指南含糊地说明了“应用程序偏好”。他们没有引用 Info.plist，因为它不能在设备上写入一次。我还（显然）希望用户对此进行备份。
如何在同一 iTunes 帐户的多个设备上启用该功能？他们是否必须在其他设备上“购买”该功能，还是有其他方法？
谢谢和问候，
--约翰
I want to implement in-app purchases to my app. I will be using the built-in product model where the IAP will unlock features within the code. My questions are:
how do I track the a purchase on a device (as to unlock the feature)? NSUserDefaults? The guide vaguely states "application preferences". They are not referring the Info.plist, as this can't be written once on the device. I also (obviously) want the user to back this up.
how do I enable the feature across mutiple devices on the same iTunes account? Do they have to "purchase" the feature on the other devices, or is there another way?
Thanks and regards,
--John
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1) NSUSerDefaults 是一个很好的解决方案
2) 使用非消耗性产品 http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/StoreKitGuide/APIOverview/OverviewoftheStoreKitAPI.html#//apple_ref/doc/uid/TP40008267-CH100-SW1
用户必须在每个设备上重新购买该产品，但只需第一次付款。出现一个弹出窗口“您已经购买了该商品”，并且您收到了相同的收据。
1) NSUSerDefaults is a good solution
2) Use a non consumable product for that http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/StoreKitGuide/APIOverview/OverviewoftheStoreKitAPI.html#//apple_ref/doc/uid/TP40008267-CH100-SW1
User have to re-buy the product in each device but pay just the first time. A pop up "you've already buy this item" appear and you receive the same receipt.