Swift Style

Adopting Access Control

Access control restricts type and symbol visibility from parts of your code to code in other types, files, and modules. A symbol can be completely visible or hidden at varying access levels. Using access control hides implementation details and establishes a preferred interface. Introduce access control early in your development process and not as an afterthought.

Access Control

Before diving into specific guidance, here’s a quick overview of Swift’s access control keywords and related terms:

public

• A public item (including types, members, protocols, and so on) can be accessed outside its defining module.

• A public class can be accessed but not subclassed outside its defining module.

• A subclass cannot override a public ...