Add this in your *rc file

open_xcode_alias.sh

open_in_xcode() {
  xfile=$1
  if [[ -d "$xfile" && ${xfile: -12} == ".xcworkspace" ]]; then
    open -a Xcode.app "$xfile"
  elif [[ -d "$xfile" && ${xfile: -12} == ".xcodeproj" ]]; then
    open -a Xcode.app "$xfile"
  else
    echo "Find project file in current dir."
    project_files=(
      $(find . -type d -depth 1 -name "*.xcworkspace")
      $(find . -type d -depth 2 -name "*.xcworkspace")
      $(find . -type d -depth 1 -name "*.xcodeproj")
      $(find . -type d -depth 2 -name "*.xcodeproj")
      $(find . -type d -depth 3 -name "*.xcodeproj")
    )
    project_files=(${project_files[@]//project\.xcworkspace/})
    if [[ -d "${project_files[1]}" ]]; then
      echo "Open ${project_files[1]}"
      open -a Xcode.app "${project_files[1]}"
    fi
  fi
}

alias xcode=open_in_xcode