Dynamically update position-value of GUI based slider

Working backwards sort of but I need to update the value-position of a GUI slider dynamically.
This is the code used to create my slider. How would I dynamically update this slider AFTER it has been created inside OnGUI?

Code (csharp):

1.  
2.     void OnGUI(){
3.     float myValue = GUI.HorizontalSlider(new Rect(Screen.width-520, _topMargin, 500, 30), myValue, -0.1F, 0.5F);
4.     GUI.Label(new Rect(Screen.width, 20, 100, 20), "Slider Label");
5.     }
6.  
7.  

 

Well with that code you can just assign a value to myValue and the slider will reflect it.

But you shouldn't use that code. OnGUI() is part of the old, obsolete, deprecated, badly-performing "Immediate mode GUI" system, and there is no reason to use that system in game these days.

 

Yes of course I know the slider value is set by myValue.
I need to update this slider at a later time dynamically. No way to do this if my slider is created with OnGUI?

 

The thing with the IMGUI is that the slider object is continually recreated every frame, which is why it performs so badly. There's no such thing as "a later time" when it comes to IMGUI.

 

Got it. Makes sense.