Compile and run Objective-C programs in a cloud workspace.
Start coding free →Objective-C is an object-oriented language built on top of C, used primarily to develop applications for Apple's macOS and iOS operating systems. It adds classes, objects, dynamic binding, and a runtime that lets developers query and extend class behavior at runtime in ways that statically compiled languages do not allow. On RunCode, the Objective-C compiler and runtime are preinstalled so you can write and compile code without any local setup.
Open a Objective-C workspace →Objective-C shares C's syntax and extends it with object-oriented constructs: classes, inheritance, methods, and message passing. The dynamic runtime is a defining characteristic. Unlike statically resolved method calls, Objective-C dispatches messages at runtime, which allows patterns like method swizzling and runtime class inspection. The language is also used to build libraries and frameworks shared across Apple-platform applications. Clang is the standard compiler, and the -lobjc flag links against the Objective-C runtime library.