Is there a way to convert a library that is built for macOS to a library that I can use in my iOS project. I'm getting an error in my app that follows:
/Users/edwardpizzurro/Desktop/LibreriasAlternativas/LibreriasAlternativas.xcodeproj Building for iOS, but the linked library 'libsndfile.a' was built for macOS.
In general, it's not possible and you have to rebuild your library specifying iOS architecture.
To get more info about your library, run
lipo -info libsndfile.a
It'll give you architectures like armv7 armv7s i386 x86_64 arm64. A default architecture for iOS is arm64, while for MacOS it's x86_64 (we are not speaking of new M1 hardware). So most probably for your libsndfile.a you'll get only x86_64.
This will mean you need to build libsndfile by yourself.
Here are releases of this lib, there's no arm64 here: https://github.com/libsndfile/libsndfile/releases
So you have to donwload the repo: https://github.com/libsndfile/libsndfile And use smth like Autotools to build it for your desired architecture.
A rough example of what you'll have to do it here: Can't cross compile C library for arm (iOS)
While it's quite specific for each library.