Can you, in Swift get a change notification when a document in the apps's iCloud Drive container changes? For example I am testing a simple concept where I am storing all app data as a json string in the app's iCloud Drive container and I am loading it when the app launches. I can retrieve and save the json string on demand on multiple devices, but I am wondering if there is a way to get a change notification sent to an app when the file is changed on another device. If so, some direction would be appreciated.
iOS iCloud document change notification
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If you are using
UIDocument, you can register forUIDocumentStateChangedNotification(for a particular document), otherwise if you are looking for changes in the App's iCloud container you need to useNSMetaDataQuerywhich is described in Discovering an App's Documents in Document-Based App Programming Guide for iOS