Objective-c doesn't see methods of Swift class

Question

Currently i need to use my Swift global variables in Objective-c code. These are my variables:

public var Name = [String]()
public var Author = [String]()
public var Url = [String]()

This is a class that returns my public variables:

@objc class AppConstant: NSObject {
   private override init() {}
   class func name() -> [String] { return Name }
   class func author() -> [String] { return Author}
   class func url() -> [String] { return Url}
}

My Objective-C code:

@implementation SecondViewController
   NSArray *urlArray;
   NSArray *nameArray;
   NSArray *authorArray;


   - (void)viewDidLoad {
       [super viewDidLoad];

       urlArray = [AppConstant url];
       nameArray = [AppConstant name];
       authorArray = [AppConstant author];


   }

@end

I think everything should be okay, but it returns error

No known class method for selector 'url'/'name'/'author'.

Can someone explain where is error. I did everything as explained here, but it doesnt works. Hope someone will help me

Thank you in advance!

Answer 1

You need @objc added to any property or method that you want exposed to Objective-C.

@objc class AppConstant: NSObject {
   private override init() {}

   @objc class func name() -> [String] { return Name }
   @objc class func author() -> [String] { return Author}
   @objc class func url() -> [String] { return Url}
}

Or you can use @objcMembers if you want to expose all non-private properties and methods:

@objcMembers class AppConstant: NSObject {
   private override init() {}

   class func name() -> [String] { return Name }
   class func author() -> [String] { return Author}
   class func url() -> [String] { return Url}
}

This is a change in Swift 4 from Swift 3. And note that the old question you linked is 4 years old. Swift has changed a lot since then.

Answer 2

You need to import

#import "productName-Swift.h"