Glossary · Web & App Development
Objective-C
Overview
What Objective-C is
Objective-C is a superset of the C language that layers on object-oriented features and a distinctive message-passing syntax borrowed from Smalltalk. Created in the early 1980s, it became the foundation of NeXTSTEP and later Apple's macOS and iOS development through the Cocoa and Cocoa Touch frameworks.
Its syntax—square-bracket message sends like [object doSomething] and named parameters—is instantly recognizable and different from most C-family languages. It relies on a dynamic runtime that resolves method calls at execution time.
How Objective-C is used today
You write Objective-C in Xcode, Apple's IDE, and build against the same frameworks Swift uses. A key strength is interoperability: Objective-C and Swift can coexist in one app, so teams can add new Swift code to an existing Objective-C codebase or call Objective-C libraries from Swift.
Since Swift's release, most new Apple development starts in Swift, and Apple positions Swift as the language of the future for its platforms. Objective-C is now most often encountered when maintaining or modernizing older apps and third-party libraries.
Why Objective-C still matters
Enormous amounts of production iOS and macOS software—including long-lived enterprise apps and popular open-source libraries—are still written in Objective-C. Understanding it is essential for maintaining, debugging, or gradually migrating these codebases to Swift.
For businesses with an older app, the practical question is usually whether to maintain, modernize incrementally, or rewrite. Because Objective-C and Swift interoperate cleanly, a phased modernization is often the lowest-risk path rather than a full rewrite.
Where we use it
Related Zen in Tech services
How our team puts Objective-C to work in real projects.
FAQ
Objective-C — common questions
Is Objective-C still used in 2026?
Yes, though far less for new projects. Apple now favors Swift for new development, but a large base of existing iOS and macOS apps and libraries remains in Objective-C, so it is still important for maintenance and modernization work.
What is the difference between Objective-C and Swift?
Objective-C is an older C superset with dynamic, message-passing syntax; Swift is a modern, type-safe language with cleaner syntax and stronger safety features. Both target Apple platforms and can be mixed in the same project.
Can Objective-C and Swift work together?
Yes. Apple designed them to interoperate within a single app, so Swift can call Objective-C code and vice versa. This makes incremental migration from Objective-C to Swift practical without a full rewrite.
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