I would like to know how to reproduce the UISlider appearance of streaming audio/video in the native iPhone player. I have it figured out except how to reproduce the available section and the empty part for the section not available.

I would like to know how to reproduce the UISlider appearance of streaming audio/video in the native iPhone player. I have it figured out except how to reproduce the available section and the empty part for the section not available.

You may end up discovering that that control isn't a UISlider as you know it. It could be a subclass or a completely different control that simply resembles a UISider.
I don't know this as a 100% true fact, but I say it because this control and the UISlider control both behave quite differently and have slightly different appearances.