Xcode beta 6 iOS 8: Simulator not working

Question

I cannot launch the simulator successfully. Once I launch the IOS Simulator this error appears:

\"Unable to boot the IOS Simulator.\"

Answer 1

I wrestled with this for a bit, with the simulator app reporting that it couldn't find the iOS8 simulator, and suggesting updating in Prefs/Downloads, which didn't work. I tried re-installing Beta 6 twice (without removing all the support files, which would have been next). The initial installation described itself as build 6A280c; a fresh download yielded build 6A280e. No luck.

Eventually, I opened Window -> Devices, and used the "+" button in the lower left to add a new simulator for iPhone 5s, iOS 8, naming it "Fresh 5s". The Schemes popup now displayed three iPhone 5S/iOS 8 options (none with the name I designated, but differentiated by UUIDs); at least one of them worked.

I'm guessing that this feature (collections of arbitrary simulator instances) will be very useful when it's baked. In the meantime, I guess I'll need to manage the list of simulators manually.

Answer 2

Do following steps worked for me:

1. Launch the iOS Simulator and go to iOS Simulator --> Reset Content and Settings...

2. Close all the applications and restart your mac 

3. Open Xcode6.0.1 or 6.0 and test the iOS Simulator

Answer 3

Had the same problem after moving from Xcode 6 beta 5 to beta 6, but also for the iOS 7.1 simulator. Restarting my machine seemed to do the job. I did not need to update from Xcode 5.1.1 CLT to Xcode 6.0 CLT.

Answer 4

I tried all of the solutions above, and was still unable to launch the iOS8 Simulator. The iOS7 Simulators all launched fine.

Looking at the Console, I found that the launch was crashing, and the crash log complained about the dynamic library, libimckit.dylib. You can read about that here: https://discussions.apple.com/thread/5781366?start=0&tstart=0

The quick solution, remove that and its partner library, reboot, and it loads.

Answer 5

Checking in the "Locations" Xcode preference, I had two items of the same version, one located in the app translocation area (/var/.../AppTranslocation/...). Also I had previously done a manual command line tools install. To resolve this in the end I had to delete /Applications/Xcode.app and remove the manual command line tools install:

sudo rm -rf /Library/Developer/CommandLineTools

Then installed Xcode anew, and rebooted. Boom! Simulator working again.

Answer 6

1. Open Xcode 6 beta
2. Goto Window > Devices
3. Click on the little + sign at the bottom
4. Add (if missing) all the devices that you want, or delete and recreate if not working.
5. If anyone of the simulator is not working then you can delete it and then re-create it again in this menu.