To get the list of recently opened apps (the list in the app switcher).
iOS 7
[[%c(SBAppSwitcherModel) sharedInstance] identifiers];
iOS 8
[[%c(SBAppSwitcherModel) sharedInstance] snapshotOfFlattenedArrayOfAppIdentifiersWhichIsOnlyTemporary];
To get the list of recently opened apps (the list in the app switcher).
[[%c(SBAppSwitcherModel) sharedInstance] identifiers];
[[%c(SBAppSwitcherModel) sharedInstance] snapshotOfFlattenedArrayOfAppIdentifiersWhichIsOnlyTemporary];