I am running xCode 8.1 with Sierra OS on a MacBook Pro (early 2011) with 16GB ram.
When running xCode, if I maximize a window, then minimize it some time later, the program crashes and I get the "Xcode quit unexpectedly" error message. When I restart xCode, everything reloads correctly and no data seems to be lost. This will happen every time I mazimize, then minimize a window. This problem did not occur with previous versions of xCode.
All other programs on the computer seem to work correctly with Sierra.