Calls the specified method after optional delay. [CallbackTweener] is used to call a method in a tweening sequence. See [method Tween.tween_callback] for more usage information. The tweener will finish automatically if the callback's target object is freed. [b]Note:[/b] [method Tween.tween_callback] is the only correct way to create [CallbackTweener]. Any [CallbackTweener] created manually will not function correctly. Makes the callback call delayed by given time in seconds. [b]Example:[/b] Call [method Node.queue_free] after 2 seconds. [codeblock] var tween = get_tree().create_tween() tween.tween_callback(queue_free).set_delay(2) [/codeblock]