URLSession委托方法不工作

Question

我将从API中读取文件，但是它的大小等于1.6mb，需要花费大量的时间。我希望按部分阅读，当我创建我需要的数据时，我将停止接收数据。我试图使用一些委托方法，但它们不起作用。我不明白哪里出问题了？

我有下一个代码：

class ViewController: UIViewController, URLSessionTaskDelegate, URLSessionDelegate, URLSessionDataDelegate {

    var httpString = "hided"

    override func viewDidLoad() {
        super.viewDidLoad()
        getLogBinData()
    }

    func getLogBinData() {
        let session = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue.main)
        if let url = URL(string: httpString + "log.bin") {
            var request = URLRequest(url: url)
            request.httpMethod = "GET"
            let task = session.dataTask(with: request)
            task.resume()
        }
    }

    func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
        print()
    }

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        if dataTask.countOfBytesReceived >= 500 {
            print(dataTask.countOfBytesReceived)
        }
    }

    func urlSession(_ session: URLSession,
                    dataTask: URLSessionDataTask,
                    didReceive response: URLResponse,
                    completionHandler: @escaping (URLSession.ResponseDisposition) -> Void) {
        if dataTask.countOfBytesReceived >= 500 {
            print(dataTask.countOfBytesReceived)
        }
    }


}

Answer 1

根据这条评论，我编辑了代码，它成功了。

class ViewController: UIViewController, URLSessionTaskDelegate, URLSessionDelegate, URLSessionDataDelegate {

    var httpString = "hided"

    override func viewDidLoad() {
        super.viewDidLoad()
        getLogBinData()
    }

    func getLogBinData() {
        let session = URLSession(configuration: .default, delegate: self, delegateQueue: OperationQueue.main)
        if let url = URL(string: httpString + "log.bin") {
            var request = URLRequest(url: url)
            request.httpMethod = "GET"
            let task = session.dataTask(with: request)
            task.resume()
        }
    }

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        if dataTask.countOfBytesReceived >= 500 {
            print(dataTask.countOfBytesReceived)
        }
    }
}