Callbacks

Lesson in the iOS Roadmap · Stage 17: Callbacks

Last updated 14 September 2026

What is Callbacks?

Callbacks are functions passed as arguments to be executed when an asynchronous operation completes. In Swift, callbacks are implemented as closures. They are used for network completion handlers, animation callbacks, and event notifications, particularly in code that predates Swift's async/await concurrency model.

Study this in the interactive course See the whole iOS roadmap

Free resources to learn Callbacks

ArticleUse callback in swift (UIKit)

Callbacks: common questions

Can I learn Callbacks in Hindi?

This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Callbacks in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.

Is this Callbacks tutorial for beginners?

It is lesson 102 of 170 in the free iOS roadmap, in stage 17, Callbacks. If you are new to iOS, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.