There was a similar question MacOS 10.12 beta / Xcode 8.0 build issues - Platform & Builds - Unreal Engine Forums, but my trouble is different.
When open UE workspace with xcode, sometime the xcode will sooner eat about 65G memory and became no response.
When I try to run a cpp project : third person template project on iPhone through xcode, if I click the project, xcode show that: Xcode failed to parse the contents of Info.plist.
May be this is a clue why it work on xcode 8.0?
Please Epic help us, we need a hotfix for this, we are almost touch the deadline and suffer this problem, we had to stop work for almost one week!