xc

xc(){
    xcode_proj=`find . -name "*.xc*" -d 1 | sort -r | head -1`

    if [ `echo -n $xcode_proj | wc -m` == 0 ]
    then
        echo "No xcworkspace/xcodeproj file found in the current directory."
    else
        echo "Found $xcode_proj"
        open "$xcode_proj"
    fi
} 

If your using Zsh, try the following

function xc {
xcode_proj=find . -name "*.xc*" -d 1 | sort -r | head -1

if [[ `echo -n $xcode_proj | wc -m` == 0 ]]
then
    echo "No xcworkspace/xcodeproj file found in the current directory."
else
    echo "Found $xcode_proj"
    open "$xcode_proj"
fi

}