class YourDotLottieObserver: Observer {
    func onComplete() {
        // Animation completed
    }

    func onFrame(frameNo: Float) {
        // New frame rendered
    }

    func onLoad() {
        // Animation loaded successfully
    }

    func onLoadError() {
        // Animation failed to load
    }

    func onLoop(loopCount: UInt32) {
        // Animation completed a loop
    }

    func onPause() {
        // Animation paused
    }

    func onPlay() {
        // Animation started playing
    }

    func onRender(frameNo: Float) {
        // Frame rendered
    }

    func onStop() {
        // Animation stopped
    }
}

// State Machine Observer
class YourStateMachineObserver: StateMachineObserver {
    func onStart() {
        // State machine started
    }

    func onStop() {
        // State machine stopped
    }

    func onTransition(previousState: String, newState: String) {
        // State machine transitioned from previousState to newState
    }

    func onStateEntered(enteringState: String) {
        // Entered a new state
    }

    func onStateExit(leavingState: String) {
        // Exited a state
    }

    func onError(message: String) {
        // Error occurred in state machine
    }

    func onCustomEvent(message: String) {
        // Custom event fired from state machine
    }

    func onInputFired(inputName: String) {
        // Input was fired in state machine
    }

    func onBooleanInputValueChange(inputName: String, oldValue: Bool, newValue: Bool) {
        // Boolean input value changed
    }

    func onNumericInputValueChange(inputName: String, oldValue: Float, newValue: Float) {
        // Numeric input value changed
    }

    func onStringInputValueChange(inputName: String, oldValue: String, newValue: String) {
        // String input value changed
    }
}

// In your view code
var animation = DotLottieAnimation(...)
var animationView = DotLottieView(dotLottie: animation)
var myObserver = YourDotLottieObserver()
var myStateMachineObserver = YourStateMachineObserver()

// Subscribe to animation events
animation.subscribe(observer: myObserver)

// Subscribe to state machine events (if using state machines)
animation.stateMachineSubscribe(myStateMachineObserver)