OpenWebRTC (by Ericsson) has a number of LGPL dependencies, and the way apps are packaged on iOS (eg, totally locked down) makes it difficult to completely follow through on the requirements of the LGPL, from a technical perspective. I'm not sure if iOS dynamic linking makes this easier?

That's without getting into the question of whether the LGPL is legally compatible with the App Store TOS. While the LGPL's use/redistribution requirements aren't as stringent as the GPL's, I'm not qualified to make that analysis, and IIRC it hasn't been tested anywhere.