Cannot conform to objective-c protocol in swift

Question

I'm trying to implement the awesome library JSQMessagesViewController but I keep getting the error "'ModelMessage' does not conform to protocol 'JSQMessageData'" even though my class inherit from NSObject and I implement the required properties

Here is the protocol:

@protocol JSQMessageData <NSObject>

@required
 - (NSString *)senderId;
 - (NSString *)senderDisplayName;
 - (NSDate *)date;
 - (BOOL)isMediaMessage;
 - (NSUInteger)messageHash;

 @optional
 - (NSString *)text;
 - (id<JSQMessageMediaData>)media;

@end

and here is my class

import Foundation

class ModelMessage: Model, JSQMessageData {

/* Required */
var senderId: NSString
var senderDisplayName: NSString
var date: NSDate
var isMediaMessage: Bool
var messageHash: UInt
/**/

var text_: String

var id:String!
var conversationId: String!
var imageUrl: String?
var recipientId: String!
var recipientRead: Bool!

var avatar: NSData?


init(data: NSDictionary){

    super.init()

    /* Required */
    self.senderId = getStringFromJSON(data, key:"senderId")
    self.senderDisplayName = "Me"
    let dateString = getStringFromJSON(data, key: "timeStamp")
    let dateDouble = (dateString as NSString).doubleValue / 1000.0
    self.date = NSDate(timeIntervalSince1970: dateDouble)
    self.isMediaMessage = false
    /**/

    self.text_ = getStringFromJSON(data, key:"text")

    self.id = getStringFromJSON(data, key:"id")
    self.conversationId = getStringFromJSON(data, key:"conversationId")
    self.recipientId = getStringFromJSON(data, key:"recipientId")
    self.recipientRead = data["recipientRead"] as! Bool

}

}

which inherit from

import Foundation

class Model: NSObject
{

func getStringFromJSON(data: NSDictionary, key: String) -> String {

    if let info = data[key] as? String{
        return info
    }
    return ""

}

}

error at which line ??

Varun Naharia
– Varun Naharia

2015-05-13 09:23:45 +00:00
Commented May 13, 2015 at 9:23 — Varun Naharia
– Varun Naharia, Commented May 13, 2015 at 9:23
on class ModelMessage: Model, JSQMessageData

Kalianey
– Kalianey

2015-05-13 09:53:38 +00:00
Commented May 13, 2015 at 9:53 — Kalianey
– Kalianey, Commented May 13, 2015 at 9:53

fluidsonic · Accepted Answer · 2015-05-13 11:14:38Z

2

Try using implicitly unwrapped optionals when implementing ObjC protocols without nullability annotations. Also you can and should always use String instead of NSString.

var senderId: String!
var senderDisplayName: String!
var date: NSDate!
var isMediaMessage: Bool
var messageHash: UInt

Annotating the whole class and/or the properties with @objc could also help.

If that still doesn't work then check the build log as it will tell you what protocol function is missing or not implemented correctly.

answered May 13, 2015 at 11:14

fluidsonic

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Comments

Varun Naharia · Accepted Answer · 2015-05-13 10:01:09Z

0

try this

import Foundation

class ModelMessage: NSObject , JSQMessageData {

/* Required */
var senderId: NSString
var senderDisplayName: NSString
var date: NSDate
var isMediaMessage: Bool
var messageHash: UInt
/**/

var text_: String

var id:String!
var conversationId: String!
var imageUrl: String?
var recipientId: String!
var recipientRead: Bool!

var avatar: NSData?


init(data: NSDictionary){

    super.init()

    /* Required */
    self.senderId = getStringFromJSON(data, key:"senderId")
    self.senderDisplayName = "Me"
    let dateString = getStringFromJSON(data, key: "timeStamp")
    let dateDouble = (dateString as NSString).doubleValue / 1000.0
    self.date = NSDate(timeIntervalSince1970: dateDouble)
    self.isMediaMessage = false
    /**/

    self.text_ = getStringFromJSON(data, key:"text")

    self.id = getStringFromJSON(data, key:"id")
    self.conversationId = getStringFromJSON(data, key:"conversationId")
    self.recipientId = getStringFromJSON(data, key:"recipientId")
    self.recipientRead = data["recipientRead"] as! Bool

}

func getStringFromJSON(data: NSDictionary, key: String) -> String {

    if let info = data[key] as? String{
        return info
    }
    return ""

}


}

answered May 13, 2015 at 10:01

Varun Naharia

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2 Comments

Varun Naharia Over a year ago

what if remove the nsobject too like class ModelMessage: JSQMessageData {

Kalianey Over a year ago

No, now I have 2 errors, it's also saying that it doesn't conform to NSObjectProtocol

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