When you start swiping it does a screenshot of the status bar and puts it at the top of the real status bar and then it changes to style UIStatusBarStyleLightContent
to UIStatusBarStyleDefault
.
You can clearly see this if you play around with it and start the swipe gesture but do not release it, not only after one minute the clock becomes outdated but if you happen to start swiping when the activityIndicator is on, you'll see it stays static.
Unfortunately, as far as I know there's no way to have two status bars, both with the right info. Maybe if you could come up with a way to continually take screenshots of the real one and dynamically invert colors, but that would be expensive, performance wise.