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
);
}",