ios - How to find OpenVPN is installed or not -

i searched openurl scheme find openvpn installed or not.
far no luck.
there other way can verify?

openvpn connect 1.0.6 , higher installs openvpn:// url scheme , can detected following code:

bool installed = [application canopenurl:[nsurl urlwithstring:@"openvpn://"]]; 

reference