Unity game build for IOS

I made a game in unity which is working fine in android but when I am trying to build that game in mac with Xcode then I am facing many errors, and I am unable to develop that game for iOS. I need someone who is experienced with unity and Xcode. All you need to do is help me to build & run my game in iOS with the help of Xcode. So i can publish my game in appstore.