How to import Objective C static library to Swift Framework?

Question

I’m writing a dynamic Framework (Proto.framework) for OS X in Swift. I want to include code from a static library (libstat.a) which is written in Objective C. Here’s what I’ve got:

// Dynamic.swift in Proto.framework
class Dynamic {
    func doSomethingWithStat() {
        Stat().statThing()
    }
}

// Stat.h in libstat.a static library
@interface Stat : NSObject
- (void)statThing;
@end

// Stat.m
@implementation Stat
- (void)statThing {
    NSLog(@"OK");
}
@end

In my target for Proto.framework, I have linked it to libstat.a. When I try to build Proto, naturally it doesn’t compile because it can’t find the definition for Stat().statThing(). It doesn’t know the symbols for my static library. How do I tell it about that?

For applications, I’d use a bridging header and do #import <Stat/Stat.h>. But the compiler errors out and tells me Bridging headers aren’t allowed in frameworks. OK.

So I include it in my “umbrella header” (Proto.h) but that tells me error: include of non-modular header inside framework module. OK.

Making my Stat library target Defines module: YES doesn’t seem to change the error even after a clean build. So I’m not sure how to do this.

Can someone point me in the right direction?

Have you managed to figure this out eventually? I am struggling with the same issue. — Niels, Aug 20 '15 at 09:33

score 10 · Answer 1 · answered Sep 30 '15 at 01:19

10

The easiest way to accomplish that is to use a module map file. Below I assume you have the Proto.framework in a separate project, which is called Proto.

Create a module.modulemap file in your framework containing the following (substitute the path to the header file as needed):

_

framework module Proto {
    umbrella header "Proto.h"

    // Load a C header to be used in Swift - here /usr/include/sys/stat.h:
    header "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/include/sys/stat.h"

    export *
    module * { export * }
}

In your project build settings find Module Map File in section Packaging. Enter $(SRCROOT)/Proto/module.modulemap

That's it. From now on you should be able to use anything declared in stat.h in Swift.

answered Sep 30 '15 at 01:19

dtbow

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not seeing a module map setting in Xcode 7.2 either unfortunately – Max MacLeod Jan 19 '16 at 09:34
@MaxMacLeod just create a new file in a text editor (TextWrangler for example) and drag n drop it to your project. Don't forget to select the target. – Michael Kork. Dec 05 '16 at 11:29
Did it worked for archiving the app as well?, after adding module.map I could resolve the issue of "include of Non modular headers" , But When I archive the project it does not find the bridging header file. complain for missing header. When I check build folder for release in derived data I dont see any hedaer file there. which was present before adding module map. any idea? I am working on xcode 10 – SSuman99 Nov 12 '18 at 09:26

score 2 · Answer 2 · answered Jul 31 '15 at 19:26

2

In your build settings for Proto.framework try setting the option Allow Non-modular Includes In Framework Modules to Yes.

answered Jul 31 '15 at 19:26

Jad

413
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Just gave it a shot and still getting `error: include of non-modular header inside framework module Proto` :\ – jbrennan Jul 31 '15 at 19:34
I have the same problem (xcode 7, swift 2). Anyone find a solution? – AlexDM0 Sep 11 '15 at 10:21
I had to make the additional header public that I was importing inside the umbrella header – Pranav Kasetti Mar 04 '21 at 19:57

score 0 · Answer 3 · answered Feb 19 '16 at 09:08

I resolved this error by making the header Public (instead of Project)

Go to your target Build Phases and move the header accordingly:

This works for my 'lib' target. But I am still unable to build libTests target. Here I get 2 errors:

'header.h' file not found with include; use "quotes" instead
and again: Include of non-modular header inside framework module 'lib'

this I am not able to resolve yet

How to import Objective C static library to Swift Framework?

3 Answers3

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