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?

Refere this link : http://stackoverflow.com/questions/24102104/how-to-import-swift-code-to-objective-c — technerd, Jan 19 '16 at 15:29
Possible duplicate of [How to call Objective C code from Swift](http://stackoverflow.com/questions/24002369/how-to-call-objective-c-code-from-swift) — Peter Hornsby, Jan 19 '16 at 15:36

technerd · Answer 1 · 2016-01-20T06:11:14.967

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

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

Create one Objective C class named User.
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];

}

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")

}

}

Go to Build Settings.
Set Product Module Name : ProjectName

Set Defines Module : YES

Set Embedded Content Contains Swift : YES

Set Install Objective-C Compatibility Header : YES

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

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

Follow Apple link for Mix and Match for detailed information.

The question is about using an Objective-C class in a project being made solely with Swift. — Yevhen Dubinin, Jan 19 '16 at 16:07
@EugeneDubinin :Thanks for alert me. I updated my answer to user Swift file in Objective C when project developed in Swift.Thanks — technerd, Jan 20 '16 at 06:12

score 3 · Answer 2 · answered Apr 22 '20 at 03:35

3

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.

answered Apr 22 '20 at 03:35

Mohammad Kamran Usmani

868
11
12

thanks buddy your answer's helped me to fix my issue. – Wilson Oct 02 '20 at 13:30

Tim Le · Answer 3 · 2021-11-08T13:33:40.533

Adding multiple Swift files to an Objective-C project.

Let’s say you want to add Class1.swift, Class2.swift, and Class3.swift file to the SwiftToObjC project

Add Class1.swift file to the project. 
XCode will ask "Would You like to configure an Objective-C bridging Header"? You choose "Create Bridging Header". So the SwiftToObjC-Bridging-Header.h file as well as the SwiftToObjC-Swift.h file are generated.
In the SwiftToObjC-Bridging-Header.h file you add this line

@class Class1;

When you add Class2.swift and Class3.swift to the project, you also add these two classes to the SwiftToObjC-Bridging-Header.h file as follows.

@class Class1;

@class Class2;

@class Class3;

  5. In the target SwiftToObjC, under Build Settings, Swift-Compiler General you should see these two settings: 

Objective-C Bridging Header -> SwiftToObjC-Bridging-Header.h

Objective-C Generated Interface Header Name -> SwiftToObjC-Swift.h

  6. In the target SwiftToObjC, under Build Settings, Define Module is set to YES.

If you want to access Class1 in say MyViewController, then in MyViewController.m, you should import.

#import "SwiftToObjC-Bridging-Header.h"

In your Class1.swift file, declare your class as “@objc public” as follows. The same @objc public is used for Class2 and Class3.

 @objc public class Class1: UITableViewController

Note that: UITableViewController is only an example for demonstration purpose.

That’s all.

The way I understand it is that the key is the "-Swift.h" file. The compiler creates this file, as explained here: https://stackoverflow.com/a/24087280/3017386 And, as mentioned in one of the comments, here: http://ericasadun.com/2014/08/21/swift-calling-swift-functions-from-objective-c/ The "-Bridging-Header.h" file contains headers which are supposed to be exposed _towards_ Swift, not the other way around. — easytarget, Nov 17 '21 at 22:18

How to access swift class in objective-c file

3 Answers3