workoutSessionMirroringStartHandler
A block that the system calls when it starts a mirrored workout session.
Declaration
var workoutSessionMirroringStartHandler: (@Sendable (HKWorkoutSession) -> Void)? { get set }Discussion
The system calls this block on the companion iPhone when someone starts a mirrored workout on Apple Watch. If your iOS app isn’t active, the system launches it in the background.
// The HealthKit store calls this closure when Apple Watch starts a remote session.
store.workoutSessionMirroringStartHandler = { mirroredSession in
// Reset the health data.
self.data = HealthData()
// Save a reference to the workout session.
self.session = mirroredSession
logger.debug("*** A session started on the companion Apple Watch. ***")
}To ensure that your app can always catch incoming mirrored workout sessions, assign this property as soon as your app launches.
The system calls this block from an arbitrary background queue.