A couple of months ago I mentioned a library that allowed you to create over a dozen different styles of progress indicators.
Here’s an open source library from Facebook that allows you to create the nice moving glow effect like the loading status used in the Facebook Paper app called Shimmer.
Shimmer allows you to apply the effect to any UIView, you can adjust the speed, opacity, duration and you can start and stop the shimmering effect if desired making it nice to use a a progress indicator.
An animation from the readme showing the effect in action:

You can find Shimmer on Github here.
A nice unobtrusive way to indicate progress to the user.
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Original article: Open Source Control Allowing You To Apply A Controllable Shimmering Effect To Any UIView
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