I need to create a static library with Swift, and I need to know how can I implement interface for the library.
In Objective-C I can mark needed headers as public in build phases, but there is not any headers and any interfaces in Swift.
What should I do with Swift?
Simply put: you don't.
Swift is not a language that separates headers and implementations. When you create a library or framework based on Swift and only for consumption by Swift, the Xcode default build setting of DEFINES_MODULE already does the job for you. This will create a .swiftmodule file, which will be used by import in other Swift projects.
If you want your code to be importable from Objective-C though, you might want to check if the SWIFT_INSTALL_OBJC_HEADER build setting is also enabled (which it is by default for frameworks as far as I know). Then the Swift compiler will generate a <ProductName>-Swift.h file for you, which you can import in Objective-C code to access your Swift classes and functions.
If you want your Swift framework to expose certain classes to the interface, simply mark the 'entities' (functions, variables etc.) public:
public class Class {} public var variable: Int public func function() { } By default, all entities have internal access.
public entities are intended for use as API, and can be accessed by any file that imports the module, e.g. as a framework used in several of your projects.internal entities are available to the entire module that includes the definition (e.g. an app or framework target).private entities are available only from within the source file where they are defined.Source: the official Swift blog.
