Have you had experience using design patterns in your projects?

Yes, design patterns are often used in iOS projects to improve the structure and maintainability of the code.

For example:

• MVC (Model-View-Controller) — separation of data, interface, and logic.
• Delegate — for passing events between objects.
• Singleton — for creating a single instance of a class, such as a settings manager.
• Observer — for responding to changes in state.

Using these patterns helps make the code more readable, extensible, and maintainable.