类型CCC不符合协议'NSObjectProtocol'

我不明白为什么我的代码不起作用.这里是:

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":"foo@example.com",
            .....
        ]

        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()

    }
}

而错误:

类型测试不符合协议'NSObjectProtocol'.

有任何想法吗？

如果你跟进继承链,NSURLSessionDataDelegate继承NSURLSessionTaskDelegate,继承NSURLSessionDelegate,继承,NSObjectProtocol.该协议具有所需的各种方法,比如isEqual(_:)和respondsToSelector(_:)你类未实现.

通常你在这里做的是使你的类继承NSObject符合NSObjectProtocol:

class Test: NSObject, NSURLSessionDataDelegate {
    ...
}