While it is possible to manually create the necessary entitlement files, by far the easiest way to configure app group membership is to do so through the Xcode Capabilities panel. This value is typically set to the package name of the iOS app prefixed with “group.” and must match in both the parent app and extension entitlement files. The value assigned to the -groups key indicates the app group to which membership is required. Both the WatchKit app Extension and the parent iOS app must include this entitlement. As with file access, each app or extension has its own set of defaults data and sandboxing prevents one process from accessing the user defaults data of another sandboxed process.Īdding an App or Extension to an App GroupĪpp Group settings are contained in entitlement files using the -groups key. The ideal location to store such settings is in the user’s defaults database. Consider, for example, an iOS app that provides the user with the ability to configure a range of preferences such as the preferred currency in which to display monetary values or the font to be used when displaying text. User defaults are used to store preferences selected by the user for the way in which an app appears and functions. In addition to files, each app can have associated with it a set of user defaults. The sandbox rules dictate that an app in one sandbox cannot access the files in the container of a second app and these same rules apply equally to the relationship between a WatchKit extension and the containing iOS app. These can be any type of file including images, videos, plain text files or even SQLite or Core Data databases. This is essentially a file system area containing directories into which the app can store and access files. Included within the sandbox of each app is a container. Sandboxing, for example, prevents one app on a device from interfering with, or accessing files and data belonging to another app installed on the same device. Sandboxes are a security mechanism that enforce sets of rules in terms of what an app can and cannot do when running on an iOS device. Although both the containing iOS app and the corresponding extension for a WatchKit app both execute on the same physical iPhone device they are said to run in separate sandbox environments.
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