Apply macros to your Objective-C APIs to customize how they're imported into Swift.
Objective-C and C Code Customization
Topics
Customizing Objective-C APIs
Designating Nullability in Objective-C APIs
Use nullability annotations or mark regions as annotated to control how Objective-C declarations are imported into Swift.
Renaming Objective-C APIs for Swift
Use the NS macro to customize API names for Swift.
Improving Objective-C API Declarations for Swift
Use the NS macro to change how an API is imported into Swift.
Grouping Related Objective-C Constants
Add macros to your Objective-C types to group their values in Swift.
Marking API Availability in Objective-C
Use a macro to denote the availability of an Objective-C API.
Making Objective-C APIs Unavailable in Swift
Use the NS macro to prevent an API from being used in Swift.
Customizing C APIs
Customizing Your C Code for Swift
Use the CF macro to group functions that have related behavior.
See Also
Language Interoperability
Migrating Your Objective-C Code to Swift
Learn the recommended steps to migrate your code.
Cocoa Design Patterns
Adopt and interoperate with Cocoa design patterns in your Swift apps.
Handling Dynamically Typed Methods and Objects in Swift
Cast instances of the Objective-C id type to a specific Swift type.
Using Objective-C Runtime Features in Swift
Use selectors and key paths to interact with dynamic Objective-C APIs.
Imported C and Objective-C APIs
Use native Swift syntax to interoperate with types and functions in C and Objective-C.