question

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when it's on startservice is started and when it's off stopservice is started

Switch provides the Toggled which will be raised when the toggle state of the switch is changed. Try to detect the event to check the status to start or stop the service.

//page.xaml
<Switch Toggled="Switch_Toggled"/>

//the switch's toggled event
private void Switch_Toggled(object sender, ToggledEventArgs e)
{
    var isToggled = e.Value; //the bool value to which the toggle control was toggled

    if (isToggled)
    {
        //switch is toggled, start the service
    }
    else
    {
        //switch isn't toggled, stop the service
    }
}

Tutorial: https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/switch#respond-to-a-switch-state-change

Best Regards,

Jarvan Zhang

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