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From Answers to Actions: Practical Function Calling with Swift & AI

A Hands-On Guide to Connecting LLMs and the Real World in Your iOS Projects

Peng Ge's avatar
Peng Ge
Jun 26, 2025
∙ Paid

Have you ever tried one of those "AI assistants" that check the weather, stock prices, or news?

They each say they are "online". But what they really are doing is function calling from the back end.

Function calling is the means by which LLMs (large language models) can actually reach out and touch the real world. It provides your model the ability to retrieve live information, execute hardware, or connect to your iOS or AI project through smart integrated APIs.

What is function calling?

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