Unity's development of iOS is still a bit annoying. Even using a Mac is annoying. Because you want to build the Xcode project. And you need to access the SDK in Xcode. So it's very messy. After a batting practice study. Finally found some concern about the build project. And that's what unity changed. You turn a Xcode project. You can update the program by updating the newly generated copy into the old one.
1. If the C # code is modified. You need to copy the classes directory below the native to the old Xcode project. The original delete. Ok.
2. If the resource is modified. You need to copy Data Libraries the two directories below the old Xcode project.
Also say that other documents can not move. This allows versioning to be managed. Instead of adding the new item every time.
Unity5.1 Create the Xcode project for iOS. How to manually incrementally update the resources and code for your app.