title: iOS Private API: lock device and power off the screen
body: <p>I'm making an app for <strong>jailbreak</strong> that lock the device when the user launch the app. I've tried <code>GSEventLockDevice();</code> from <code>GraphicsServices.framework</code> but this does not work properly because it locks the screen but does not power off the screen. Is there another way to lock the screen without <code>MobileSubstrate</code>?</p>