How to use a Swift protocol in ObjC Framework

Question

I just started to add Swift in my ObjC framework project because it is quite new, solver directly the gap to CloudKit and therefore maybe interesting to migrate to code step-by-step to Swift.

I tought i start with something simple, a protocol.

I did the following: - I created a Swift file, and as you know there is no bridghing header for frameworks - added my protocol in this file

and know i like to use it in my class's but well how? The solution for classes is simple, you just define a forward declaration. But was is about protocols?

It seems at them moment this is the last element which i have to migrate or do you know a approach?

Updated:

What i forget to mentioned, i marked the protocol @objc, because in general it is possible to use a Swift protocol in ObjC but i just see at the moment restrictions in frameworks

In your Obj-C implementation (.m) file did you add #import <##Your-Project-Name##>-Swift.h? — Erik
– Erik, Commented Jun 8, 2014 at 17:25

Erik · Accepted Answer · 2014-06-08 17:39:33Z

1

Here's an example in my project name SwiftProtocol:

Renderable.swift

@objc protocol Renderable
{
    @objc func render()
}

Triangle.h

#import "SwiftProtocol-Swift.h"    // This is very important!

@interface Triangle : NSObject <Renderable>

@end

Triangle.m

@implementation Triangle

- (void)render
{
   // Do some rendering
}

@end

answered Jun 8, 2014 at 17:39

Erik

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