swift 3 method in objective-c fails with no visible @interface for 'MySwiftClass' declares the selector 'addX:andY'

Question

we are trying to reference swift methods inside an objective-c implementation.

Swift 3 Class:

import Foundation
@objc class MySwiftClass: NSObject {         


        

Answer 1

As ekscrypto in Swift 4 or later all functions need @objc if you use less versión than Swift 4 is enough @objc in class. Of course in Objective-C class you must add import of NAME_PROJECT-swift.h. If your project name is Sample then you must add:

#import Sample-swift.h

And then:

Swift 4 or Less

@objc class MySwiftClass: NSObject {
    
    func sayHello(){
      //function
    }

    func addX(){
      //function
    }
}

Swift 4 or Greater

@objc class MySwiftClass: NSObject {
    
    @objc func sayHello(){
      //function
    }

    @objc func addX(){
      //function
    }
}