iPhone wont show up on itunes

I was trying to charge my iphone and for several weeks i havent gone to itunes to do any change in my iphone,today i went to sync new music and my iphone is charging but it wont show on itunes,i updated the latest version of itunes,i also restart my comp,restart my iphone but nothing is working,so my usb cable is working cause is charging my iphone but the iphone is not recognized on itunes...i googled every possible reason but nothing seems to work,i have a MacBook Pro if this can help,i will appreciate