https://stackoverflow.com/questions/30939453/how-to-uninstall-downloaded-xcode-simulator
最简单的处理方式是命令行执行下面命令删除所有模拟器，然后重新添加需要的模拟器即可。
xcrun simctl list | grep -w "Shutdown" | grep -o "([-A-Z0-9]*)" | sed 's/[\(\)]//g' | xargs -I uuid xcrun simctl delete uuid
