[oriolid]

That developer must be misinformed. I have been developing a native component that needs to interface with C++ APIs from the app and Objective C APIs from iOS. The only thing you need to remember is to not mix exceptions from C++ and Objective C. The object models are also incompatible, but the compiler prevents you from mixing them.

[comex]

Also, if C++ is only used in the library implementation... you wouldn't even need Objective-C++ unless you needed to add Objective-C API calls to the library's own source files. Otherwise, you could just compile the library's source files as regular C++, and link them together with your Objective-C code. This works exactly the same way as combining C and C++, and Xcode (the IDE) has no issue with it. So it seems very likely that the developer was misinformed.