ios - 如何将最新版本的通行证与旧版本进行比较以确定哪些字段已更改？

Question

Passbook Programming Guide说过:

The device compares the latest version of the pass against the version it had before to determine which fields have changed.

我的问题是:在我自己的应用程序中，如何确定哪些字段发生了变化？通行证是否有诸如版本号之类的字段来指示相同通行证类型 ID 和序列号的通行证更新？

Answer 1

也来自 Passbook Programming Guide .

To receive notifications when the pass library changes, register for the PKPassLibraryDidChangeNotification notification. Pass the instance of PKPassLibrary as the object. The pass library isn’t a singleton; each instance sends its own notifications, and you want the notifications from this particular instance. Use the addObserverForName:object:queue:usingBlock: method to specify that you want to respond on the main queue and provide a block to handle the notification. The user info dictionary of the notification describes what changed. Alternately, use the dispatch_async and dispatch_get_main_queue functions to respond on the main thread.

没有版本号，但您可以检查 manifest.json 的内容或哈希。如果任何哈希值发生了变化，您将知道通行证已更改。