Imported C and Objective-C APIs

Overview

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.

Topics

Swift and Objective-C in the Same Project

• Importing Objective-C into Swift
• Importing Swift into Objective-C

Cocoa Frameworks

• Working with Foundation Types
• Working with Core Foundation Types

Objective-C APIs

• Using Imported Lightweight Generics in Swift
• Using Imported Protocol-Qualified Classes in Swift

C APIs

• Using Imported C Structs and Unions in Swift
• Using Imported C Functions in Swift
• Using Imported C Macros in Swift

See Also

Language Interoperability with Objective-C and C

• Objective-C and C Code Customization
• Migrating Your Objective-C Code to Swift
• Cocoa Design Patterns
• Handling Dynamically Typed Methods and Objects in Swift
• Using Objective-C Runtime Features in Swift
• Calling Objective-C APIs Asynchronously