Objective C Bridging Header for frameworks

问题:

I've made a framework that requires the sqlite3 framework. How do I add a Objective C Bridging Header for my framework that imports sqlite3 into my Swift file?

I already have a bridging header file for my project, but not for my framework.

回答1:

I found a Objective-C Bridging Header setting in the target Build Settings. It was hidden by default. Check All instead of Basic.

In recent Xcode versions this solution would give the error Using bridging headers with framework targets is unsupported.

The workaround I've been using is to make the C-header public in the file inspector and import it in MyFramework.h like this example:

#import <MyFramework/MyObjectiveC.h>

How to change the C-header to public

Open your C-header and view the inspector by clicking in the upper right corner. To view the file inspector, click the file icon in the upper right corner.

回答2:

just import your sqlite3 framework in your objective-c bridging file. You then automatically can use it in Swift.

Apple Docs:

Interoperability is the ability to interface between Swift and Objective-C in either direction, letting you access and use pieces of code written in one language in a file of the other language. As you begin to integrate Swift into your app development workflow, it’s a good idea to understand how you can leverage interoperability to redefine, improve, and enhance the way you write Cocoa apps. One important aspect of interoperability is that it lets you work with Objective-C APIs when writing Swift code. After you import an Objective-C framework, you can instantiate classes from it and interact with them using native Swift syntax.

EDIT: You even can import an Objective-C framework or Swift framework or a mixed-language framework just into your swift file with

import yourFramework

Apple Docs:

Importing External Frameworks

You can import external frameworks that have a pure Objective-C codebase, a pure Swift codebase, or a mixed-language codebase. The process for importing an external framework is the same whether the framework is written in a single language or contains files from both languages. When you import an external framework, make sure the Defines Module build setting for the framework you’re importing is set to Yes.

You can import a framework into any Swift file within a different target using the following syntax:

SWIFT

import FrameworkName

You can import a framework into any Objective-C .m file within a different target using the following syntax:

@import FrameworkName;