In this header you can import source files for your Swift class. Now, you have ios_objc_mix-Bridging-Header.h file. In Objective-C, you work with references to objects by using pointers that can be null, called nil in Objective-C.

And create new Swift class.Īfter that, you will see the following popup message:

Let’s start from Objective C project, and will try to add Swift code to this project. But in spite of it I would like to share my experience on real examples, because it’s not as simple as it sounds. Apple provides a tutorial how to do this magic. TestCppClass::TestCppClass(const std::string &title): m_title(title) you can see, everything is the same as in the first example, that is, we wrap calls to C ++ code with Objective C ++, and cast to produce the necessary data types where appropriate.Yes, there is opportunity to combine this languages in the same project. In the *.cpp file we add the implementation of our class: #include 'TestCppClass.h' Open this newly created header file and add a description of the class interface: #include In order to use Swift code inside Objective-C one must scrifice some Swift features and write a wrapper around original Swift code that won’t use non-compatible features (like structs. h class MySwiftClass Compiler will generate the interface for objc marked class in MyModuleName-Swift.h file. m file: import ' (ProjectName)-Swift.h' Declare in header. When asked “should we add “Bridging header” to the project”, answer yes. Add objc to your Swift-class (' MySwiftClass ').

We choose “Swift” as the language, device – “Universal”, don’t use “Use Core Data” and then choose a place to save the project.Īdd to the project a new C++ source file, enter the name and tick “Also create a header file”. (name of project, name of organization, identifier of organization). Run Xcode and create “Simple View Application”. ExamplesĮxample 1: Using С++ source files in a Swift-project. This variant can also be used in Swift, here’s how:ġ) In a Swift project we add source files in С++Ģ) Write a wrapper class for the C++ code in Objective-C++.ģ) Add the header file of the wrapper class to the bridging header file.Ĥ) Use the wrapper class in Swift. The most simple and trivial is to change the file extension to the implementation of the class (from *.m to *.mm) and use Objective C++ as a wrapper for the C++ code (or write the whole project in Objective C++ so that there won’t be a problem with the imported headers file). The Objective C++ solutionīut what can we do if we need to use project code in Swift which was written in C++? In Objective-C there are several ways to use C++ code. But this problem can be worked around with the help of bridging headers we can import Objective-C class headers and they will be available in Swift. Swift is a cool high-level programming language, but it’s still quite young and doesn’t have as many libraries and components as Objective-C.

Swift code in objective c