I upgrade to Yosemite my Mini Mac (yesterday) and after a long hours (almost a day) the installation was succeeded.
I enter in my source code in Xcode 6.0.1 and after automatically install several things (i just saw the message and wait) i can't see the iOS simulators just iOS Device.
I check in Preferences but i have iOS Simulator 7.1 checked but i don't have any other simulator and i can't see 7.1 simulator either.
Thanks for your help.
EDIT **** After install Xcode 6.1 I saw my iOS simulators again in Xcode. I saw a message "installed required components" when first launched the new Xcode version, so I supposed that fix it.
Thanks for your help.