How does Uber achieve this UI in WatchKit?

Question

How does it superimpose elements (the timer is above the map) ?
To my understanding, you can only use background images on groups, no other kind of custom views...

Any idea ?

Answer 1

My initial guess is that they're using a dynamically-generated image of a map as the background image in the group. The giveaway is that, while WKInterfaceMap allows you to add custom annotations, you can't draw custom shapes like the blue route line.

I could be way off.