A customizable scrubber bar, inspired by Apple Music.
Usage:
Add a UIView to a storyboard and change its class to ScrubberBar.
Appearance can be tweaked using the IBInspectable properties
Progress can be set by invoking setProgress(progress: Float)
Scrubbing events can be detected by adopting the ScrubberBarDelegate protocol and monitoring values from scrubberBar(bar: ScrubberBar, didScrubToProgress: Float)