I have a UISlider with a customized appearance (via setThumbImage, etc.).
At some point in my application, I need to be able to reset the UISlider’s look back to the default images.
I tried setting all images to nil, but that just made the slider disappear altogether:
[slider setThumbImage:nil forState:UIControlStateNormal];
[slider setMinimumTrackImage:nil forState:UIControlStateNormal];
[slider setMaximumTrackImage:nil forState:UIControlStateNormal];
Since you have over rided the default images, you have to recreate the slider or have default images separately and then add it.