Hands-On Design Patterns with Swift

Importing Objective-C in Swift

This is usually how we discover the interoperability layer. An existing Objective-C code base is getting upgraded to Swift and you need to expose existing Objective-C classes to your new Swift code. 

In Swift, all of your classes are available in the current module, depending on their access control scopes. In Objective-C, one developer need is to import a header through the #import "MyClass.h" directive or the module through @import ExternalLibrary. In order to expose your classes to Swift, you'll need to use a bridging header. Its responsibility is to expose only the classes you wish to the Swift compiler.

The bridging header is a header file that contains all of the import statements of the libraries and ...