iTween更改onupdate代理方法

void CallBack(string callbackType){
if (tweenArguments.Contains(callbackType) && !tweenArguments.Contains("ischild")) {
//establish target:
GameObject target;
if (tweenArguments.Contains(callbackType+"target")) {
target=(GameObject)tweenArguments[callbackType+"target"];
}else{
target=gameObject;
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////
if (tweenArguments[callbackType] is Action<object>)
{
((Action<object>)tweenArguments[callbackType]).Invoke((object)tweenArguments[callbackType + "params"]);
}
else
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//throw an error if a string wasn't passed for callback:
if (tweenArguments[callbackType].GetType() == typeof(System.String)) {
target.SendMessage((string)tweenArguments[callbackType],(object)tweenArguments[callbackType+"params"],SendMessageOptions.DontRequireReceiver);
}else{
Debug.LogError("iTween Error: Callback method references must be passed as a String!");
Destroy (this);
}
}
}

iTween.ValueTo(gameObject, iTween.Hash("from", 1,
"to", 0,
"speed", 1,
"onupdate", (Action<object>)(newVal =>
{ hudStatusSlider.value = (float)newVal; })
));