Xcode 6.0.1 iOS 8 simulator not able to access : U

问题:

This error is always happening:

Unable to boot device in current state: Creating

I have tried many more but last two days no result.

回答1:

You will need to delete this device from your simulator and recreate it.

• From inside the iOS Simulator application menu, choose Hardware > Device > Manage Devices
• In the Simulators list on the left, select the device that is unable to boot and press the delete key

Now use the + in the bottom left to add a new device with the same hardware / OS configuration.

NOTE: If your simulator complains it cannot find the iOS 8 simulator, and you are sure you have it installed, try rebooting your computer. After rebooting, follow the steps above.

回答2:

This is a known issue that can be caused by renaming Xcode.app or deleting an older Xcode.app and later running one at a different location. The "new" Xcode.app was trying to create a device but certain data needed to create the device was unavailable (because Xcode.app was deleted), and we leave the device in that state and force manual resolution to avoid possible data loss by automatically deleting the device.

I suggest you reboot to make sure you are in a clean state and then run 'xcrun simctl erase [device udid]' where you can determine the udid by running 'xcrun simctl list'

回答3:

Instead of deleting the simulator, I was able to solve the issue with those steps:

1. Close Xcode and Simulator

2. Restart the CoreSimulator service:

   sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService
   

If it's not enough, you can also unpair/delete whatever Apple Watch is paired with your iPhone Simulator, then repeat the steps 1 and 2 above.

And after that the error "Unable to boot device in current state: Creating" should be gone.