This tutorial will guide you through understanding and resolving the swift compiler Error – “Non-modular header inside framework module”.
When working with Swift and frameworks, you may encounter the error message “non-modular header inside framework module.” This error typically occurs when you’re importing a framework into your Swift project and the framework contains headers (.h files) that are not marked as “public” or “module” headers.
To resolve this issue, you can follow the steps below:
1. Understand the Error:
The error message non-modular header inside framework module indicates that the compiler encountered a header file within a framework that is not marked as modular. In Swift, frameworks are expected to have modular headers, which enable Swift code to interact with Objective-C code seamlessly.
When a header is marked as non-modular, it means that it is not exposed to modules outside of the framework, causing issues when trying to import the framework into Swift code.
2. Mark Headers as Public:
Make sure that the header files you want to include in your framework are marked as public. This is done using the public keyword in the framework’s umbrella header.
For example, if your framework is named “MyFramework,” check the MyFramework.h file, and ensure that the relevant headers are marked as public like this:
// MyFramework.h #import <MyFramework/PublicHeader1.h> #import <MyFramework/PublicHeader2.h> // ... other headers
3. Verify Module Definition:
Ensure that your framework’s module.modulemap file is correctly configured to include the public headers. The module.modulemap file specifies the structure of a module.
For example:
// module.modulemap
framework module MyFramework {
umbrella header "MyFramework.h"
export *
module * { export * }
}
Ensure that the umbrella header directive points to the correct umbrella header file.
4. Check Header File Locations:
Ensure that the public headers are located in the “Headers” folder of your framework’s target. Xcode should automatically recognize headers in this folder as public.
5. Update Header Search Paths:
Check the header search paths in your project settings. Make sure that the paths are correctly set to include the folder where your public headers are located.
6. Clean and Build:
After making these changes, clean your project and rebuild it. This can be done by selecting “Product” -> “Clean Build Folder” in Xcode and then building the project again.
7. Verify Module Import:
When using the framework in your Swift code, make sure to import the module correctly:
import MyFramework
8. Xcode Settings:
Ensure that your Xcode project settings have the correct configurations, especially in the “Build Settings” section related to the framework module and header file locations.
By following these steps, you should be able to resolve the “non-modular header inside framework module” error in Swift. If the issue persists, double-check your configurations and consult the official Swift and Xcode documentation for additional guidance.