Calling a Swift function from Objective-C class

Question

I'm trying to call a Swift function from an Objective-C class and it's throwing:

No visible @interface for 'TUtils' declares the selector 'run'

TUtils.swift

@objc
public class TUtils: NSObject  {
    
    @objc func run() {
        print("Hello test")
    }
}

Consume.m

#import <RKit/RKit-Swift.h>
    
inline int tempFun () {
    TUtils *obj = [TUtils new];
    [obj run];
    return 0;
}

thanks

timbre timbre · Accepted Answer · 2022-08-28 22:36:24Z

1

Typical issue is that functions need to be public in order to be visible by Objective-C. As docs say:

By default, the generated header contains interfaces for Swift declarations marked with the public or open modifier. If your app target has an Objective-C bridging header, the generated header also includes interfaces marked with the internal modifier.

So try to change your function to

@objc public func run() {

and see if this helps. If it does not, clear and rebuild from scratch. You can also open RKit-Swift.h (by command+click on it) and check how TUtils was declared and which functions Objective-C sees.

edited Aug 28, 2022 at 22:36

answered Aug 28, 2022 at 22:19

timbre timbre

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2 Comments

SDev Over a year ago

Thanks setting public before the function, solved my issue

timbre timbre Over a year ago

Great, if you accept the answer, it can be referred by others then. Cheers!

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