Have you ever find it now?
HamGuy
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Well, here is my solution now:
declare a variable to store the time last face updated
private var lastFaceUpdateTime: TimeInterval?
update the time when the face updated:
func session(_ session: ARSession, didUpdate anchors: [ARAnchor]) {
guard let faceAnchor = anchors.first as? ARFaceAnchor else { return }
lastFaceUpdateTime = session.currentFrame?.timestamp
}
check if the face exist
func session(_ session: ARSession, didUpdate frame: ARFrame) {
updateFaceDetectedState()
}
func updateFaceDetectedState() {
guard let lastFaceUpdateTime = lastFaceUpdateTime else {
return
}
DispatchQueue.main.async {
let currentTime = CACurrentMediaTime()
let timeSinceLastUpdate = currentTime - lastFaceUpdateTime
if timeSinceLastUpdate < 0.5 {
print("Face is inside the scene view")
} else {
print("Face is outside the scene view")
}
}
}