Trying to implement ObjectiveC protocol in Swift

Question

I am trying to implement the below protocol in Swift which is written in objective-c however I am still receiving compiler errors saying that the class does not conform to the protocol. What am I doing wrong? I have tried setting getters and setters and applying the @NSCopying flag but to no avail.

#import <Foundation/Foundation.h>

@protocol AIConfiguration <NSObject>

@property(nonatomic, copy) NSURL *baseURL;

@property(nonatomic, copy) NSString *clientAccessToken;

@property(nonatomic, copy) NSString *subscriptionKey;

@end

Here is my implementation

class AIMyConfiguration : NSObject, AIConfiguration {

    var baseURL : NSURL
    var clientAccessToken : NSString
    var subscriptionKey : NSString

    override init() {
        super.init()
    }
}

Thank you

Objective-C properties are very different from Swift instance variables. Have you tried adding a getter and setter method that match what Objective-C's properties actually create? — nhgrif
– nhgrif, Commented Mar 4, 2015 at 21:31

rintaro · Accepted Answer · 2015-03-05 02:39:59Z

This Objective-C protocol:

@protocol AIConfiguration <NSObject>
@property(nonatomic, copy) NSURL *baseURL;
@property(nonatomic, copy) NSString *clientAccessToken;
@property(nonatomic, copy) NSString *subscriptionKey;
@end

is translated to Swift as:

protocol AIConfiguration : NSObjectProtocol {
    @NSCopying var baseURL: NSURL! { get set }
    var clientAccessToken: String! { get set }
    var subscriptionKey: String! { get set }
}

So you have to implement like:

as ImplicitlyUnwrappedOptional

class AIMyConfiguration: NSObject, AIConfiguration {
    @NSCopying var baseURL: NSURL!
    var clientAccessToken: String!
    var subscriptionKey: String!

    override init() {
        super.init()
    }
}

OR as Optional:

class AIMyConfiguration: NSObject, AIConfiguration {
    @NSCopying var baseURL: NSURL?
    var clientAccessToken: String?
    var subscriptionKey: String?

    override init() {
        super.init()
    }
}

OR non optional:

class AIMyConfiguration: NSObject, AIConfiguration {
    @NSCopying var baseURL: NSURL
    var clientAccessToken: String
    var subscriptionKey: String

    init(baseURL:NSURL, clientAccessToken:String, subscriptionKey:String) {
        self.baseURL = baseURL
        self.clientAccessToken = clientAccessToken
        self.subscriptionKey = subscriptionKey
        super.init()
    }
}

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