Today in the morning I tried to compile my project to run in my device and I found the destination toolbar disappeared and I cannot choose my IOS device or IOS Simulator dev
I'm running with same problem. You can select device or change scheme using below steps:
Alternative Solution:
The only solution is to use Xcode 7 or above
. I've installed Xcode 7.1 and found Scheme/Simulator list available. Refer screenshot.
It seems that Xcode 6 or below doesn't support OS X El Capitan.