isWatchAppInstalled property
The user can choose to install only a subset of available apps on Apple Watch. The value of this property is true when the Watch app associated with the current iOS app is installed on the user’s Apple Watch or false when it is not installed.
The value in this property is valid only for a configured session that has been activated successfully. If the ActivationState property is available, its value must be ActivationState.activated. When the session becomes inactive or deactivated, you should ignore the value in this property.
Implementation
final bool isWatchAppInstalled;