Dev:SBAppSwitcherModel

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];

Snapshot

-(id)snapshot; returns an NSArray of SBDisplayLayout as seen below

<SBDisplayLayout: 0x170838540> {
    SBDisplayLayoutDisplayItemsPlistKey =     (
                {
            SBDisplayItemDisplayIdentifierPlistKey = \"com.apple.Preferences\";
            SBDisplayItemTypePlistKey = App;
        }
    );
    SBDisplayLayoutSizePlistKey =     (
        0
    );
},

References