How do I safely call an optional protocol method?

You should always use the respondsToSelector: method to check if the adopting object implements the optional method before invoking it to prevent runtime crashes.

Why use protocols instead of inheritance?

Protocols allow for multiple inheritance of behavior through composition, enabling different class hierarchies to share a common interface without being related.

Can Objective-C categories add instance variables to a class?

No, categories cannot add instance variables directly, but they can use associated objects via the Objective-C runtime to simulate property behavior.

What is the difference between a category and a class extension?

A category is usually public and adds methods to a class, while a class extension (anonymous category) is private to the implementation file and can add both methods and properties.

Objective-C Protocols & Categories

Name: Objective-C Protocols & Categories
Author: TheBushidoCollective

byTheBushidoCollective

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Mobile Development

Implements modular Objective-C architectures using formal protocols, class extensions, and categories for flexible code extension and interface definition.

This skill provides Claude with deep expertise in Objective-C's most powerful modularity features: protocols and categories. It enables the creation of clean, decoupled interfaces through formal protocol declarations, the implementation of flexible delegate patterns with optional methods, and the extension of existing classes—including system frameworks—without the need for subclassing. It also covers class extensions for private API management, helping developers maintain high-quality, professional Apple platform codebases with patterns for modular and reusable code design.

주요 기능

01Implementing optional protocol methods with runtime safety checks

0295 GitHub stars

03Extending system and custom classes using Objective-C categories

04Managing private state and methods via anonymous class extensions

05Defining formal protocols for interface contracts and polymorphism

06Utilizing associated objects for property-like behavior in categories

사용 사례

01Organizing large implementation files by splitting functionality into logical categories

02Adding utility methods to Foundation or UIKit classes like NSString, NSArray, or UIColor

03Implementing Delegate and Data Source patterns for iOS and macOS applications

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thebushidocollective/han objc-protocols-categories

For use in Claude.ai and ChatGPT

Download Skill