How do you structure and design components of an application during architecture planning?

When designing the architecture of an iOS application, the following steps are usually followed:

1. Requirements and functionality definition — what the application should do.
2. Choosing an architectural pattern — MVC, MVVM, VIPER, etc., based on complexity and scalability.
3. Breaking down into modules and components — identifying screens, services, data models.
4. Defining interactions between components — through delegates, notifications, closures, or reactive approaches.
5. Layer design — UI, business logic, network and data handling.
6. Identifying common services — for example, for network operations, database, authentication.

Example: in MVVM, ViewController is responsible only for display, ViewModel for logic and data preparation, Model for data structure and network/database operations.