How to make UISlider's “track” invisible?

Question

I\'m trying to emulate Apple\'s \"Slide to Unlock\" feature in my application. I get to this point (image below), but as you can see the UISlider\'s \"track\" is visible and is

Answer 1

Looks like just setting the tint color to clear does it...

    [slider setMinimumTrackTintColor:[UIColor clearColor]];
    [slider setMaximumTrackTintColor:[UIColor clearColor]];