SBSyncController

Kill all applications in switcher

1. First kill all the applications

  [(SBSyncController *)[NSClassFromString(@"SBSyncController") sharedInstance] _killApplications]; 

2. then remove the applications from the switcher

iOS 8

  [[[NSClassFromString(@"SBAppSwitcherModel") sharedInstance] valueForKey:@"_recentDisplayLayouts"] removeAllObjects];

iOS 7

  [[[NSClassFromString(@"SBAppSwitcherModel") sharedInstance] valueForKey:@"_recentDisplayIdentifiers"] removeAllObjects];