ios测试上传和下载速度

import UIKit

import Foundation

class VNetSpeedTester: NSObject {

    typealias UploadSpeedCompletion = (String?) -> Void

    typealias DownloadSpeedCompletion = (String?) -> Void

    class func testUploadSpeed(completion: @escaping UploadSpeedCompletion) {

        let urlString = "https://mensura.cdn-apple.com/api/v1/gm/slurp"

        guardleturl =URL(string: urlString)else{

            print("Invalid URL")

            completion(nil)

            return

        }

        var urlRequest = URLRequest(url: url, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 10)

        urlRequest.httpMethod="POST"

        urlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")


        let emptyData = createEmptyData(of: 1048576) // Adjust the size as needed


        letjson: [String:Any] = ["file": emptyData.base64EncodedString()]

        ifletjsonData =try?JSONSerialization.data(withJSONObject: json,options: []) {

            urlRequest.httpBody= jsonData

        }else{

            print("Failed to encode JSON data")

            completion(nil)

            return

        }


        letsessionConfiguration =URLSessionConfiguration.ephemeral

        letsession =URLSession(configuration: sessionConfiguration,delegate:nil,delegateQueue:nil)


        let startTime = CFAbsoluteTimeGetCurrent()


        session.dataTask(with: urlRequest) { (data, response, error)in

            ifleterror = error {

                print("Error: \(error)")

                completion(nil)

                return

            }

            ifletresponse = responseas?HTTPURLResponse{

                ifresponse.statusCode==200{

                    letelapsedTime =CFAbsoluteTimeGetCurrent() - startTime

                    letuploadSpeed =Double(emptyData.count) / elapsedTime// bytes per second

                    letspeedString =self.convertBytesToReadableSpeed(bytesPerSecond: uploadSpeed)


                    print("Upload completed in \(elapsedTime) seconds")

                    print("Upload speed: \(speedString)")


                    completion(speedString)

                }else{

                    print("Server returned non-200 status code")

                    completion(nil)

                }

            }

        }.resume()

    }

    class func testDownloadSpeed(completion: @escaping DownloadSpeedCompletion) {

        guard let url = URL(string: "https://images.apple.com/v/imac-with-retina/a/images/overview/5k_image.jpg") else {

            print("Invalid URL")

            completion(nil)

            return

        }

        letsession =URLSession(configuration: .default)

        let startTime = CFAbsoluteTimeGetCurrent()


        lettask = session.downloadTask(with: url) { [self] (location, response, error)in

            ifleterror = error {

                print("Download error: \(error.localizedDescription)")

                completion(nil)

                return

            }


            guardletlocation = locationelse{

                print("Download location not found")

                completion(nil)

                return

            }


            do{

                letfileManager =FileManager.default

                letdocumentsURL =tryfileManager.url(for: .documentDirectory,in: .userDomainMask,appropriateFor:nil,create:false)

                letdestinationURL = documentsURL.appendingPathComponent(url.lastPathComponent)


                try? fileManager.removeItem(at: destinationURL)

                tryfileManager.moveItem(at: location,to: destinationURL)


                letendTime =CFAbsoluteTimeGetCurrent()

                letelapsedTime = endTime - startTime

                letfileSize =tryfileManager.attributesOfItem(atPath: destinationURL.path)[.size]as?Int??0

                letspeed = fileSize /Int(elapsedTime)


                print("Downloaded\(url.lastPathComponent)(\(fileSize)bytes) in\(elapsedTime)seconds. Average speed:\(speed)bytes/sec")


                letconvertedSpeed =convertBytesToReadableSpeed(bytesPerSecond:Double(speed))

                completion(convertedSpeed)


            }catch{

                print("Error saving file: \(error.localizedDescription)")

                completion(nil)

            }

        }

        task.resume()

    }

    privateclassfunccreateEmptyData(ofsize:Int) ->Data{

        returnData(count: size)

    }

    private class func convertBytesToReadableSpeed(bytesPerSecond: Double) -> String {

        letformatter =ByteCountFormatter()

        formatter.allowedUnits = [.useBytes, .useKB, .useMB, .useGB, .useTB]

        formatter.countStyle= .file


        letspeedString = formatter.string(fromByteCount:Int64(bytesPerSecond))

        return"\(speedString)/s"

    }

}

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