How to reference or call a view controller written in Swift from another controller written in Objective-C?

Question

I have an Objective-C project, and need hints on how to call a ViewController which is in Swift from another controller in Objective-C?

Create a `Objective-c Generated Interface Header` in your apps build setting. Now you can use this header to import you swift code in you Objective-C code and just use the view controller like you would any other. — rckoenes, Aug 25 '15 at 10:08

dangnabit · Accepted Answer · 2015-08-25T10:19:25.953

18

Apparently it's quite easy.

You have to first make sure you're prepending your class declaration with @objc so that it's available to your Objective-C ones.

For example:

import Foundation

// Belongs to target 'TestProject'
@objc class SwiftController: UIViewController {

    //... truncated

}

Now you simply have to import the name of your target (that the swift controller belongs to), appended with '-Swift.h'—exposing its interface—like so:

#import "TestProject-Swift.h"

edited Aug 25 '15 at 10:19

answered Aug 25 '15 at 10:13

dangnabit

1

no result, when i import a class #import "TestClass-Swift.h" doesen't find that class – rimtej Aug 25 '15 at 11:58
1

You need to go in to your build settings and set the `Objective-c Generated Interface Header.` – rckoenes Aug 25 '15 at 12:40
@rckoenes doesen't work yet? – rimtej Aug 25 '15 at 13:54
2

Make sure you're not importing the class and importing the **target** your class is in. So, if your class `TestClass` is in a project named `TestProject` (most likely with an auto-generated target called `TestProject`), then you would need to import `TestProject-Swift.h`. Remember, Swift files don't have headers. – dangnabit Aug 25 '15 at 21:25

score -3 · Answer 2 · answered Aug 25 '15 at 10:12

-3

Create a new file "YourAppName-Bridging-Header.h" and in this file you have to import "Your objective-C view controller.h"

Go to Build setting and search for bridging header and link with your birdging-header path.

Now you are able to write code in swift as usual.

answered Aug 25 '15 at 10:12

Sudhir

3

I think OP is asking about accessing a Swift controller in an Objective C file. – dangnabit Aug 25 '15 at 10:17
1

You can use this either you have to use swift controller in objective C file or objective C controller in swift file. – Sudhir Aug 25 '15 at 10:40
1

Right, I see what you mean. Don't you have to prepend the Swift classes with `@objc`? – dangnabit Aug 25 '15 at 10:43
You shouldn't make the header anyway. It is automatically generated with the proper settings. Making it yourself invites a lot of user error. – Abandoned Cart Jul 29 '19 at 19:47

2 Answers2