https://shibuya24.info/entry/unity-dotween-callback

DOTweenCallback.cs

void Start()
{
    var tween = transform.DOLocalMoveX (2f, 1f)
        .OnStart (() => Debug.Log ("OnStart"))
        .OnPlay (() => Debug.Log ("OnPlay"))
        .OnKill (() => Debug.Log ("OnKill"))
        .OnComplete (() => Debug.Log ("OnComplete"))
        .OnPause (() => Debug.Log ("OnPause"))
        .OnRewind (() => Debug.Log ("OnRewind"))
        .OnStepComplete (() => Debug.Log ("OnStepComplete"))
        .OnUpdate (() => Debug.LogWarning ("OnUpdate"))
        .OnWaypointChange (x => Debug.Log ("OnWaypointChange" + x));    
}