A Boolean value indicating whether the counterpart app is available for live messaging.
- iOS 9.0+
- watchOS 2.0+
This property is
true when the WatchKit extension and the iOS app can communicate with each other.
WatchKit extension. The iOS device is within range, so communication can occur and the WatchKit extension is running in the foreground, or is running with a high priority in the background (for example, during a workout session or when a complication is loading its initial timeline data).
iOS app. A paired and active Apple Watch is in range, the corresponding WatchKit extension is running, and the WatchKit extension’s
In all other cases, the value is
The counterpart must be reachable in order for you to send messages using the
send methods. Sending messages to a counterpart that is not reachable results in an error.
The value in this property is valid only for a configured session that has been activated successfully. If the
activation property is available, its value must be
WCSession. When the session becomes inactive or deactivated, you should ignore the value in this property.