Build swift framework that used 3rd party Objective-C framework

Does the Objective-C framework define a module? Look for the Defines Module (

DEFINES_MODULE

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

No, it does not.

I make some dummy Objective-C frameworks for testing and noticed that the "Defines Module" setting makes a difference.

Thank you

… the "Defines Module" setting makes a difference.

Right. For Swift to be able to access a framework it must define a module. Defines Module is an easy way to do that, although there are other options (search the build settings for “module” for more info on those).

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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Is there any way to expose the objects, methods and types that are in the third party obective-c framework? I seem to be missing something either in my search paths or what I am including as public headers.

Thanks

I’m not sure which steps you’re missing but I just tried the following here in my office and it worked a treat:

1. I created a new project, MyFrameworkClient, from the iOS > Single View App template, setting the language to Swift.

2. I created a new target, MyFramework, from the iOS > Cocoa Touch Framework template, setting the language to Objective-C.

   Note This template sets the Defines Module (

   DEFINES_MODULE

   ) build setting by default.

3. In the project navigator’s

   MyFramework

   group, I created a new file from the iOS > Cocoa Touch Class template with the following details:

   • Name: MyObjCClass

   • Subclass of: NSObject

   • Language: Objective-C

4. In

   MyObjCClass.h

   I added this method:

   + (void)myObjCMethod;

   -

5. In

   MyObjCClass.m

   I add its implementation:

   + (void)myObjCMethod {
       NSLog(@"Hello Cruel World!");
   }

   -

6. In

   MyFramework.h

   , I added this line to the end:

   #import <MyFramework/MyObjCClass.h>

   -

7. I selected

   MyObjCClass.h

   in the project navigator and then brought up the file inspector (View > Utilities > Show File Inspector). In the Target Membership list I selected Public from the popup next to MyFramework.

8. I switched to the MyFramework scheme and built that.

9. I switched to the MyFrameworkClient scheme and built that.

10. In

    ViewController.swift

    , I added this line to the imports section:

    import MyFramework

    and this line to the body of

    viewDidLoad()

    :

    MyObjCClass.myObjCMethod()

    -

11. I built and ran the app.

12. In Xcode’s console I saw this:

    2017-08-18 09:56:25.339820+0100 MyFrameworkClient[62436:8801877] Hello Cruel World!

    -

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—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Ahhh...yes I see that I can create my own objective C framework to work with my swift framework. Cool...

What I was shooting for is leveraging someone else's third party framework (either wrapping it or exposing some of its functionality). It sounds like I should be able to embed the third party asset into my own objective C wrapper. I originally tried including the third party framework in my swift framework and even got it to build but the code would crash (I expect a dylib error or some bundle I did not include).

Thanks