For some reasons I have to have a UILabel with a custom background view which I wanted to achieve by [label addSubview:backgroundView].
The background renders fine, but the Labels text does not appear.
What I can't do is using the background color with a pattern image.
As I've read some more posts I had to re-consider and in the end use a subclasses UIView. Not preferable as said in my post and comment, but finally working.