The information in this section helps you use the iOS SDK with Adobe Analytics.
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As of September 2018, we released a new, major version of the SDK. These new Adobe Experience Platform Mobile SDKs are configurable through Experience Platform Launch.
In the SDKs, identifiers are used to track users, and here is the hierarchy of identifiers:
The correct acronym for Experience Cloud Identifier is ECID. Although the SDKs still use MID, it is the old name.
The AID, which is also sometimes referred to as the Tracking Identifier, is generated by the SDK when the app is not configured to use an MID. The value persists between launches and app upgrades in
NSUserDefaults. If the user deletes the app from their device and then re-installs the app, or if the app developer clears out
NSUserDefaults, a new identifier is generated by the SDK. This process results in a new user in Analytics reporting.
For users in an app that introduces Identity service support (MID), existing AID values are sent with Analytics hits, and the Analytics hit contains an AID and an MID. For new users in an app with Identity service support, the Analytics requests contain only an MID. For more information about identifying visitors, see Unique visitors in the Adobe Analytics documentation.