jaclync/Within a mixed framework.md

## Within a mixed framework.md

      
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              Within a mixed framework.md
            
          
    Importing Objective-C into Swift

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"

Importing Swift into Objective-C

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:

Apple doc

Could be useful if we don't want to expose Objc headers in umbrella header:
https://github.com/danieleggert/mixed-swift-objc-framework
\	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"`