QtQuick gestures not working on iPhone 6 with iOS v11.3

import QtQuick 2.7
import QtQuick.Controls 2.1
import QtQuick.Dialogs 1.2
import QtSensors 5.0

MessageDialog {
    id: msgDialog
}


SensorGesture {
    id: sensorGesture
    gestures : ["QtSensors.shake", "QtSensors.whip", "QtSensors.twist", "QtSensors.cover",
        "QtSensors.hover", "QtSensors.turnover", "QtSensors.pickup", "QtSensors.slam" , "QtSensors.doubletap"]
    
    enabled: true
    
}

Button {
    text: "Gestures available?"
    onClicked: {
        msgDialog.title = 'Gestures available'
        msgDialog.text = String(sensorGesture.availableGestures)
        msgDialog.open()
    }
}