How to access swift class in objective-c file

Question

I have a swift project and i import a singleton, objective-c coded class in the project.

I tried to import the productname_swift.h file but no luck.

How can i access swift class in that singleton class?

Answer 1

Project made in Swift : To use Swift class in Objective C

To use Swift class in Objective C , follow given steps :

1. Create one Objective C class named User.
2. A popup display with "Would You like to configure an Objective-C bridging Header". Choose Create Bridging Header.

User.h

#import <Foundation/Foundation.h>

@interface User : NSObject

+(id) sharedUser ;

@end

User.m

#import "User.h"
#import "SwiftInObjectiveC-swift.h"


@implementation User


//Singleton of User

+(id)sharedUser{

    static User *sharedUser = nil;
    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        sharedUser = [[self alloc] init];

        //Class Method of ViewController.swift
        [ViewController mySwiftClassFunction];


        //Instance Method of ViewController.swift
        ViewController *vc = [[ViewController alloc] init];
        [vc mySwiftFunction];

    });
    return sharedUser;
}

-(void) myObjcectivecMethod {

    ViewController *vc = [[ViewController alloc] init];
    [vc mySwiftFunction];

}

3. Add @objc in your .swift class in front of Class name.

    import UIKit
   
    @objc class ViewController: UIViewController {
   
   override func viewDidLoad() {
       super.viewDidLoad()
       // Do any additional setup after loading the view, typically from a nib.
   }
   
   override func didReceiveMemoryWarning() {
       super.didReceiveMemoryWarning()
       // Dispose of any resources that can be recreated.
   }
   
   func mySwiftFunction() {
   
       print("Swift Function")
   }
   
   class func mySwiftClassFunction (){
   
       print("Swift Class Function")
   
   }
   
   }
   

4. Go to Build Settings.

5. Set Product Module Name : ProjectName

6. Set Defines Module : YES

7. Set Embedded Content Contains Swift : YES

8. Set Install Objective-C Compatibility Header : YES

9. Set Objective-C Bridging Header : SwiftInObjectiveC/SwiftInObjectiveC-Bridging-Header.h

10. Import Auto generated header "ProjectName-swift.h" in your *.m file.
11. Clean and Run your Project.
12. It will work!!!

Follow Apple link for Mix and Match for detailed information.

Answer 2

It is very simple use Swift classes in Objective-C. Just follow steps given below

• Open your Objective-C project.
• Add a new swift file to the project.
• One default dialogue will open to create a bridging header (If it
  does not open by default, add a bridging header file).

• Go to build settings type Swift Compiler and you will see Your ProjectName-Swift.h in Swift Compiler- General like below

• Import you desired swift classes build and run.