Swift class in Objective C Project

Question

I'm having problems executing some Swift code in an existing ObjC project. This is my first attempt at Swift so I'm sure I'm missing something simple.

I have added my new swift file to my project - this process generated the bridging header. So now I have the following:

bridging-header file

//
//  Use this file to import your target's public headers 
//  that you would like to expose to Swift.
//

#import "historyViewController.h"

In my swift file I have the following test class and function:

import Foundation

@objc class Hello: NSObject {
    func sayHello() {
        print("Hi There")
    }
}

In my historyViewController.m file I have the following

#import "xx-Bridging-Header.h"

In my historyViewController.h file I have the following

@class Hello;

How do I actually go about executing the sayHello function from within my historyViewController.m file? I've tried [Hello sayHello]; - but get 'no known class method'.

matt · Accepted Answer · 2016-10-15 02:29:31Z

1

The problem is only that you are calling sayHello as if it were a class method, but sayHello is declared as an instance method. So:

[[Hello new] sayHello];

edited Oct 15, 2016 at 2:29

answered Oct 15, 2016 at 2:19

matt

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5 Comments

Amin Negm-Awad Over a year ago

Or the other way round: Make it a type method (aka class method).

user1542125 Over a year ago

How do I make it a type method?

user1542125 Over a year ago

When I do [[Hello new] sayHello]; I get error - Receiver 'Hello' for class message is a forward declaration

user1542125 Over a year ago

Wow, you're quite rude. Why you took the time I don't know.

matt Over a year ago

Sorry about that. I'll delete that comment. But when you deleted @class Hello; how did things go? This is very easy stuff so it's a pity you're having so much difficulty getting started with it.

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