Question: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec mauris nibh, venenatis sed purus nec, consequat commodo turpis. Quisque rhoncus maximus mattis. Morbi convallis sagittis lectus eget mollis. Nunc tristique, lectus ac faucibus elementum, dui enim porta ex, nec vestibulum sem neque sit amet est. Donec massa arcu, fermentum a massa eu, maximus rutrum urna. Vestibulum imperdiet pulvinar ipsum, non imperdiet orci efficitur quis. Donec volutpat erat dui, a sodales enim blandit ut. Pellentesque ac imperdiet nibh, sed feugiat lorem. Praesent in velit et est tempus facilisis sed at urna. Nulla sapien sem, sagittis eu mauris quis, consequat tempor sem. Mauris rhoncus, turpis eu vehicula volutpat, nibh libero fermentum quam, vel posuere ante metus quis leo. Maecenas et lorem feugiat neque lobortis accumsan.

Answer: 
You should use the opaque type [`CGColorRef`](https://developer.apple.com/documentation/graphicsimaging/reference/CGColor/Reference/reference.html) instead of `UIColor` on your struct. Then, in the CocoaTouch portion of your code you could get a `UIColor` instance like this:

```
UIColor *color = [UIColor colorWithCGColor:colorRef];

```
How is it possible that in this example: <http://developer.apple.com/library/ios/#samplecode/SpeakHere/Listings/AudioViews_LevelMeter_h.html#//apple_ref/doc/uid/DTS40007802-AudioViews_LevelMeter_h-DontLinkElementID_7>

they are using the struct with UIColor\*?