# iOS ## Deprecated iOS Attributes The iOS platform on which the iOS application is running. | Attribute | Type | Description | Examples | Stability | | ----------- | ------ | ---------------------------------------------------------------------------------------------------------------- | ---------------------------------- | ------------------------------------------------------------------------------------------------------------------ | | `ios.state` | string | Deprecated use the `device.app.lifecycle` event definition including `ios.state` as a payload field instead. [1] | `active`; `inactive`; `background` | 
Moved to a payload field of `device.app.lifecycle`. | **[1]:** The iOS lifecycle states are defined in the [UIApplicationDelegate documentation](https://developer.apple.com/documentation/uikit/uiapplicationdelegate#1656902), and from which the `OS terminology` column values are derived. `ios.state` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used. | Value | Description | Stability | | ------------ | -------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- | | `active` | The app has become `active`. Associated with UIKit notification `applicationDidBecomeActive`. |  | | `background` | The app is now in the background. This value is associated with UIKit notification `applicationDidEnterBackground`. |  | | `foreground` | The app is now in the foreground. This value is associated with UIKit notification `applicationWillEnterForeground`. |  | | `inactive` | The app is now `inactive`. Associated with UIKit notification `applicationWillResignActive`. |  | | `terminate` | The app is about to terminate. Associated with UIKit notification `applicationWillTerminate`. |  |