I noticed some bugs on devices with RTL direction (arabic)
SBUChannelListViewController- channel table view cell contains only the avatar (no nickname and message preview)
SBUChannelViewController- image and channel name in the navigation bar are in LTR direction
- Attachment source selection sheet is in LTR
It is kind of blocker for us as our app target country uses arabic language. I guess fixes on your side will be easy (replacing right/left with trailing/leading). In LTR everything looks great so we prefer to not implement custom views by our own.