Can’t use Swift classes inside Objective-C

I spent about 4 hours trying to enable Swift in my Xcode Objective-C based project. My myproject-Swift.h file was created successfully, but my Xcode didn’t see my Swift-classes. So, I decided to create a new Xcode Objc-based project and finally, I found the right answer! Hope this post will help someone 🙂

Step by step Swift integration for Xcode Objc-based project:

1. Create new *.swift file (in Xcode) or add it by using Finder.
2. Create an Objective-C bridging header when Xcode asks you about that.

3. Implement your Swift class:

   import Foundation
   
   // use @objc or @objcMembers annotation if necessary
   class Foo {
       //..
   }
   

4. Open Build Settings and check these parameters:

   • Defines Module : YES
     

     Copy & Paste parameter name in a search bar

   • Product Module Name : myproject
     

     Make sure that your Product Module Name doesn’t contain any special characters

   • Install Objective-C Compatibility Header : YES
     

     Once you’ve added *.swift file to the project this property will appear in Build Settings

   • Objective-C Generated Interface Header : myproject-Swift.h
     

     This header is auto-generated by Xcode

   • Objective-C Bridging Header : $(SRCROOT)/myproject-Bridging-Header.h

5. Import Swift interface header in your *.m file.

   #import "myproject-Swift.h"
   

   Don’t pay attention to errors and warnings.

6. Clean and rebuild your Xcode project.
7. Profit!