Notes about the app switcher on iOS 8. It was SBAppSliderController in iOS 7.
Activating the app switcher
[[%c(SBUIController) sharedInstance] _activateAppSwitcher];
Toggling the app switcher
[[%c(SBUIController) sharedInstance] _toggleSwitcher];
Determining if switcher is visible/showing
[[%c(SBUIController) sharedInstance] isAppSwitcherShowing]