Can't use Swift classes inside Objective-C

Question

I try to integrate Swift code in my app.My app is written in Objective-C and I added a Swift class. I've done everything described here. But my problem is that Xcode haven't created the -Swift.h file, only the bridging headers. So I created it, but it's actually empty. I can use all my ObjC classes in Swift, but I can't do it vice versa. I marked my swift class with @objc but it didn't help. What can I do now?

EDIT: Apple says:" When you import Swift code into Objective-C, you rely on an Xcode-generated header file to expose those files to Objective-C. [...] The name of this header is your product module name followed by adding “-Swift.h”. "

Now when I want to import that File, it gives an error:

    //MainMenu.m      #import "myProjectModule-Swift.h" //Error: 'myProjectModule-Swift.h' file not found      @implementation MainMenu 

Here is my FBManager.swift file:

@objc class FBManager: NSObject {      var descr = "FBManager class"      init() {         super.init()     }      func desc(){         println(descr)     }      func getSharedGameState() -> GameState{         return GameState.sharedGameState() //OK! GameState is written in Objective-C and no error here     } } 

Answer 1

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!

Answer 2

Don't create the header file yourself. Delete the one you created.

Make sure your Swift classes are tagged with @objc or inherit from a class that derives (directly or indirectly) from NSObject.

Xcode won't generate the file if you have any compiler errors in your project - make sure your project builds cleanly.