I am using Xcode 10.0 and running in 12.1.1(16C50). It was given below error.
iOS 12.1.1 not supported by Xcode 10.0: Could not locate device support files
Please upgrade your Xcode IDE to 10.1.
Xcode 10.1 Release Notes can be found at, https://developer.apple.com/documentation/xcode_release_notes/xcode_10_1_release_notes/
Just download latest OS SDK (iOS 12.2) and paste it on respective location.
Downloadable URL:
Follow below step.
1) Unzipped downloaded file
2) Right click on Xcode and click on Show Package Content
3) Then paste your file on path
Contents -> Developer -> Platforms -> iPhoneOS.platforms -> DeviceSupport
4) Restart Xcode
Is it very convenient, saving the trouble of updating Xcode. what? You can't find a new Device Support file! Ok, you can copy it out from your friend's latest Xcode, or download from here
Update:
The added iOS Disk image for iOS 13.0, 12.3 and iOS 12.4
Download Developer disk image for iOS 12.1 from https://github.com/xushuduo/Xcode-iOS-Developer-Disk-Image/releases and perform following steps
- Unzipped downloaded file
- Right click on Xcode and click on "Show Package Content"
- Then paste your file on path "Contents -> Developer -> Platforms -> iPhoneOS.platforms -> DeviceSupport"
- Restart Xcode
Thats It....
来源：https://stackoverflow.com/questions/53815085/could-not-locate-device-support-files-ios