Use native Swift syntax to interoperate with types and functions in C and Objective-C.
You can access and use pieces of code written in C and Objective-C from within your Swift code. After you import an Objective-C framework, a C library, or a header file, you can work with Objective-C classes and protocols, as well as common C constructs, functions, and patterns.
Access your Swift code from within your Objective-C codebase, and your Objective-C code from Swift.
Access classes and other declarations from your Objective-C code in Swift.
Access Swift types and declarations from within your Objective-C codebase.
Use bridged Foundation types in your Swift codebase to work with dates, times, and other values.
Work directly with memory-managed Core Foundation types in your Swift code, and manually handle retains as needed.
Understand the constraints of imported Obj-C lightweight generic type declarations.
Learn how imported Objective-C protocol-qualified classes and metaclasses are represented.
Learn how Swift represents imported C structures and unions, including types with bitfields and unnamed fields.
Learn how to call imported functions that are declared in a C header.
Use imported C-defined macros as constants.
Apply macros to your Objective-C APIs to customize how they're imported into Swift.
Learn the recommended steps to migrate your code.
Adopt and interoperate with Cocoa design patterns in your Swift apps.
Cast instances of the Objective-C id type to a specific Swift type.
Use selectors and key paths to interact with dynamic Objective-C APIs.