Encapsulates REST API request building, execution, retry logic (for VK-specific errors like rate limiting), and JSON response parsing into model objects. Demonstrates a clean separation of concerns where networking logic is isolated from VK-specific error handling, making it adaptable to other REST APIs with minimal changes.

Provides dynamic JSON-to-object mapping using Objective-C runtime, allowing flexible model classes that adapt to changing API responses without explicit property mapping. This reduces boilerplate and enables robust handling of evolving APIs, showcasing advanced runtime techniques for reusable data modeling.

Collection of static helper functions for GUID generation, query string creation, version checks, URL encoding, and string manipulation. These utilities are completely decoupled from VK-specific logic and offer generic, well-tested solutions for common iOS development tasks.

Generic implementation of a dictionary that maintains insertion order, independent of any VK-specific functionality. Demonstrates a reusable data structure solution for scenarios where order preservation in key-value storage is required.

Abstracts resource loading (images, localized strings) between the main bundle and the SDK's bundle, enabling customization while providing default resources. This pattern is useful for any iOS framework distributing resources and shows thoughtful resource isolation.