CPVoiceControlTemplateExample.swift

    enum VoiceControlStates: String {  
        case loading = "loading"  
        case listening = "listening"  
        case recognized = "recognized"  
    }  
      
    let vct = CPVoiceControlTemplate(voiceControlStates: [  
        CPVoiceControlState(identifier: VoiceControlStates.loading.rawValue, titleVariants: ["loading"], image: nil, repeats: true),  
        CPVoiceControlState(identifier: VoiceControlStates.listening.rawValue, titleVariants: ["listening"], image: nil, repeats: true),  
        CPVoiceControlState(identifier: VoiceControlStates.recognized.rawValue, titleVariants: ["recognized"], image: nil, repeats: true)  
    ])  
    CPBaseController.sharedInstance.interfaceController?.pushTemplate(vct, animated: true)  


Crash:

    0   CoreFoundation                    0x1e873bef8 __exceptionPreprocess + 228  
    1   libobjc.A.dylib                   0x1e7909a40 objc_exception_throw + 55  
    2   CoreFoundation                    0x1e8640ac4 +[NSException raise:format:] + 115  
    3   CarPlay                           0x2125a7944 CPAssertAllowedClasses + 159  
    4   CarPlay                           0x2125a79c4 -[CPInterfaceController pushTemplate:animated:] + 83  
    5   Flitsmeister                      0x100bfe700 closure #1 in static FMCPMapTemplate.installMapButtons(template:) + 8349440 (FMCPMapTemplate.swift:53)  
    6   Flitsmeister                      0x100c005dc thunk for @escaping @callee_guaranteed (@guaranteed CPMapButton) -> () + 8357340 (:0)  
    7   CarPlay                           0x2125a57fc -[CPMapButton handlePrimaryAction] + 91  
    8   CarPlay                           0x2125b5b8c __50-[CPMapTemplate handleActionForControlIdentifier:]_block_invoke + 687  
    9   libdispatch.dylib                 0x1e81736c8 _dispatch_call_block_and_release + 23  
    10  libdispatch.dylib                 0x1e8174484 _dispatch_client_callout + 15  
    11  libdispatch.dylib                 0x1e81209ec _dispatch_main_queue_callback_4CF$VARIANT$mp + 1067  
    12  CoreFoundation                    0x1e86ca1bc __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 11  
    13  CoreFoundation                    0x1e86c5084 __CFRunLoopRun + 1963  
    14  CoreFoundation                    0x1e86c45b8 CFRunLoopRunSpecific + 435  
    15  GraphicsServices                  0x1ea938584 GSEventRunModal + 99  
    16  UIKitCore                         0x215540bc8 UIApplicationMain + 211  
    17  Flitsmeister                      0x100424418 main + 115736 (main.m:36)  
    18  libdyld.dylib                     0x1e8184b94 start + 3  

Just one minor issue there that took me some time to figure out as Apple's documentation was lousy at that time. CPVoiceControlTemplate is modal so you need to use ...interfaceController.presentTemplate(vct, animted: true) instead of push...

Thanks a bunch, that was it, we we're looking ages for it! xD

Works !
Thanks a lot :)