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 covering up my text. Is there a way to change an attribute programmatically that will make the "track" invisible?

Please let me know if you need any of my code.

Thanks in advance!

EDIT: If I change the slider's alpha to 0, it gets rid of my sliding button, so doing that won't work unless I'm doing it wrong. :)

Answer 1

here's an even easier way. No need to create images, just instantiate an empty UIImage class :P

UIImage *clearImage = [[UIImage alloc] init];
[self.slider setMinimumTrackImage:clearImage forState:UIControlStateNormal];
[self.slider setMaximumTrackImage:clearImage forState:UIControlStateNormal];