Type CCC doesnt conform to protocol 'NSObjectProtocol'

Question

I don't understand why my code doesn't work. Here it is:

class Test: NSURLSessionDataDelegate {

    func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {

        if(error == nil) {
            print("Hallo")
        } else {
            print(error?.userInfo)
        }
    }

    func createRequest() {

        let dictionary = [
            "mailAddress":"[email protected]",
            .....
        ]

        let nsData: NSData?
        do {
            nsData = try NSJSONSerialization.dataWithJSONObject(dictionary, options: NSJSONWritingOptions(rawValue:0))
        } catch _ {
            nsData = nil
        }

        let defaultConfigObject = NSURLSessionConfiguration.defaultSessionConfiguration()
        let defaultSession = NSURLSession(configuration: defaultConfigObject, delegate: self, delegateQueue: NSOperationQueue.mainQueue())
        let url = NSURL(string: "http:...")!
        let urlRequest = NSMutableURLRequest(URL: url)
        urlRequest.HTTPMethod = "POST"
        urlRequest.HTTPBody = nsData
        urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
        let dataTask = defaultSession.dataTaskWithRequest(urlRequest)
        dataTask.resume()

    }
}

And the error:

Type Test does not conform to protocol 'NSObjectProtocol'.

Any ideas?

Answer 1

If you follow up the inheritance chain, NSURLSessionDataDelegate inherits NSURLSessionTaskDelegate, which inherits NSURLSessionDelegate, which inherits, NSObjectProtocol. This protocol has various required methods like isEqual(_:) and respondsToSelector(_:) which you class does not implement.

Generally what you would do here is make your class inherit NSObject which conforms to NSObjectProtocol:

class Test: NSObject, NSURLSessionDataDelegate {
    ...
}