When i got to choose a simulator to run my app on in Xcode 6.1.1. I see a guid next to the simulator name.
For example the choices I see are:
iPad 2 (062B5AD7-65CD-4079-B06E-182A6D110DB4)
iPAD 2 (49DA9317-4493-4664-9c25-172A97CEFA41)
iPad 2 (FCF2A5C#-9460-4C22-A948-3633C876FC35)
How do i get rid of these guids?
The problem is that you've created too many iPad 2 simulators (and similarly for the others that look that same way). The interface needs some way to distinguish them so it adds their UID. Just delete simulators in the Window > Devices interface until you've only got one of each desired device type/SDK.
来源：https://stackoverflow.com/questions/27368784/seeing-a-guid-as-part-of-the-simulator-choices