I guess what they meant was: "In order to build an IOS project, you'd better run a Jenkins AGENT on a Mac, not your Jenkins itself.".
Check out the various Jenkins Agent (formerly known as Slave) plugins (SSH, Swarm, ...) to find one that fits your needs an use that to connect a Mac agent tou your main Jenkins.
Other than that, it MIGHT be possible to (cross-) build IOS projects on Linux, but I'm not sure since I'm not an IOS developer.
HTH...
Dirk
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Dirk Heinrichs
Senior Systems Engineer, Delivery Pipeline
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