Delete simulator refences for xCode:

Delete the particular simulator runtime references (*.simruntime) in the folder: /Library/Developer/CoreSimulator/Profiles/Runtimes

Delete simulator images from the hard disk:

Delete the particular simulator images (*.dmg) in the folder: ~/Library/Caches/com.apple.dt.Xcode/Downloads

Mac Xcode 删除已经下载好的模拟器版本