To import a set of Objective-C files in the same framework target as your Swift code, you’ll need to import those files into the Objective-C umbrella header for the framework.
- Under Build Settings, in Packaging, make sure the Defines Module setting for that framework target is set to “Yes”.
- In your umbrella header file (
FrameworkName.h), import every Objective-C header you want to expose to Swift. For example:
#import <XYZ/XYZCustomCell.h>
#import <XYZ/XYZCustomView.h>
#import <XYZ/XYZCustomViewController.h>
Swift will see every header you expose publicly in your umbrella header. The contents of the Objective-C files in that framework will be available in any Swift file within that framework target automatically, without any import statements. Use your custom Objective-C code with the same Swift syntax you use with system classes.
let myOtherCell = XYZCustomCell()
myOtherCell.subtitle = "Another custom cell"
To import a set of Swift files in the same framework target as your Objective-C code, you don’t need to import anything into the umbrella header for the framework. Instead, import the Xcode-generated header file for your Swift code into any Objective-C .m file you want to use your Swift code from.
Because the generated header for a framework target is part of the framework’s public interface, only declarations marked with the public or open modifier appear in the generated header for a framework target.
Swift methods and properties that are marked with the internal modifier and declared within a class that inherits from an Objective-C class are accessible to the Objective-C runtime. However, they are not accessible at compile time and do not appear in the generated header for a framework target.
For more information on access-level modifiers, see Access Control in The Swift Programming Language (Swift 4.1).
- Under Build Settings, in Packaging, make sure the Defines Module setting for that framework target is set to “Yes”.
- Import the Swift code from that framework target into any Objective-C .m file within that framework target using this syntax and substituting the appropriate names:
#import <ProductName/ProductModuleName-Swift.h>
The Swift files in your framework target will be visible in Objective-C .m files containing this import statement. For information on using Swift from Objective-C code, see Using Swift from Objective-C.
| \ | Import into Swift | Import into Objective-C |
|---|---|---|
| Swift code | No import statement | #import <ProductName/ProductModuleName-Swift.h> |
| Objective-C code | No import statement; Objective-C umbrella header required | #import "Header.h" |
Reference:
Could be useful if we don't want to expose Objc headers in umbrella header: https://github.com/danieleggert/mixed-swift-objc-framework