How to build on recent Unity and Xcode

[mistletoe-fujimura]

The instruction of building in Readme.md is obsolete for recent Unity and Xcode.
I succeeded building as following with Unity 2019 and Xcode 12.

1. Make Assets/Plugins/iOS folder in your Unity project and copy all iCade*{.h,m,mm} files in this repository to the folder.
2. On Project view of Unity IDE, select each Assets/Plugins/iOS/iCade*.m file and input "-fno-objc-arc" to Inspector>Platform Settings>Compile flags.
3. Build.

and you should read 'VisualStudio' or some other editors instead of 'MonoDevelop' in the instruction. :-)