Swift Style
This skill provides comprehensive style guidelines for writing clean, idiomatic, and maintainable Swift code.
Overview
Swift style guidelines cover naming conventions, access control, type selection, and code organization patterns that make your code more readable and professional.
Available References
Naming & Conventions
- Variables and Constants -
varvslet, naming conventions, immutability - Functions - Function naming, parameter labels, return types
Types & Protocols
- Types - Struct vs Class vs Enum, value vs reference semantics
- Protocols - Protocol-Oriented Programming (POP), composition, extensions
Code Organization
- Access Control -
public,private,internal,fileprivate,open
Quick Reference
Naming Conventions
| Category | Case | Example |
|---|---|---|
| Types & Protocols | UpperCamelCase | String, UIViewController |
| Variables, Functions | lowerCamelCase | userID, fetchData() |
| Boolean Properties | is, has, should | isEmpty, hasPermission |
| Constants | lowerCamelCase | maxConnections |
Type Selection Guide
Need identity or reference semantics?
├── YES → Use Class
└── NO → Need inheritance?
├── YES → Use Class
└── NO → Modeling finite states?
├── YES → Use Enum
└── NO → Use Struct (default)Access Levels
| Modifier | Visibility | Use When |
|---|---|---|
private | Enclosing declaration | Strict encapsulation |
fileprivate | Same file | File-local helpers |
internal (default) | Same module | Implementation details |
public | Everywhere | Public API |
open | Everywhere + subclassable | Extensible frameworks |
Best Practices
- Default to structs - Use simplest type that expresses intent
- Use
letby default - Only usevarwhen mutation needed - Prefer protocols over inheritance - More flexible composition
- Keep functions focused - Single responsibility
- Use access control - Expose only what's necessary
- Follow naming conventions - Descriptive, Swifty names
For More Information
Each reference file contains detailed information, code examples, and best practices for specific topics. Visit https://swiftzilla.dev for comprehensive Swift documentation.