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. [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. Example: [codeblock] var tween = get_tree().create_tween() tween.tween_callback(queue_free).set_delay(2) #this will call queue_free() after 2 seconds [/codeblock]