ios – 使swift类符合定义属性的objective c协议

我无法使快速类符合目标c协议.在 swift中很容易在目标c协议中实现这些方法,但我无法在以下协议中实现这些属性.

协议是

@protocol ATLParticipant <NSObject>
@property (nonatomic,readonly) NSString *firstName;
@property (nonatomic,readonly) NSString *lastName;
@property (nonatomic,readonly) NSString *fullName;
@property (nonatomic,readonly) NSString *participantIdentifier;
@end

我已经制作了这个应该符合它的快速类,但是Xcode说它没有.

class ConversationParticipant: NSObject,ATLParticipant {
    var firstName: NSString?
    var lastName: NSString?
    var fullName: NSString?
    var participantIdentifier: NSString?

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

我已经尝试使成员变量可选(如上所述),并解包,并使用private(set)作为前缀,以使它们只读,但这些变体都不起作用.

class ConversationParticipant: NSObject,ATLParticipant {

    var firstName: String!
    var lastName: String!
    var fullName: String!
    var participantIdentifier: String!
    var avatarImage: UIImage!

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