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省略されていたコードを追記しまいした
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@@ -28,83 +28,247 @@
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```Swift
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/*
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/*URLSessionとURLSessionDelegateをまとめたクラスのサンプル*/
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import Foundation
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class NetworkDownloader
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class NetworkDownloader: NSObject {
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static let shared = NetworkDownloader
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static let shared = NetworkDownloader()
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var sessionConfiguration = URLSessionConfiguration.default
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var urlSession: URLSession?
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var runningURLs: [URL: Int] = [:]
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var runningTasks: [URL: URLSessionDownloadTask] = [:]
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weak var delegate: NetworkQueueDelegate?
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override init() {
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super.init()
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sessionConfiguration.httpMaximumConnectionsPerHost = 5
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urlSession = URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: n
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urlSession = URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: .main)
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}
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}
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func startDownloadTask(with url:
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func startDownloadTask(with url: String, with opIndex: Int) {
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print("Starting task: (url)")
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guard let networkURL = URL(string: url) else {
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return
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}
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runningURLs[networkURL] = opIndex
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let downloadTask = urlSession?.downloadTask(with: networkURL)
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downloadTask
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}
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let
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}
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//
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let
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runningTasks[networkURL] = downloadTask
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downloadTask?.resume()
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}
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func cancelDownloadTask(with url: String, with opIndex: Int) {
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guard let networkURL = URL(string: url) else {
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return
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}
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let task = runningTasks[networkURL]
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runningTasks.removeValue(forKey: networkURL)
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runningURLs.removeValue(forKey: networkURL)
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task?.cancel()
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}
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}
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extension NetworkDownloader: URLSessionDownloadDelegate, URLSessionDelegate {
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func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
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guard let networkURL = downloadTask.currentRequest?.url,
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let index = runningURLs[networkURL] else {
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return
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}
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// Remove the running task
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runningTasks.removeValue(forKey: networkURL)
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runningURLs.removeValue(forKey: networkURL)
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self.delegate?.notifyOfNetworkOperationCompletion(with: networkURL.absoluteString,
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fileURL: location.absoluteString,
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operationIndex: index, error: nil)
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}
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func urlSession(_ session: URLSession,
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downloadTask: URLSessionDownloadTask,
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didWriteData bytesWritten: Int64,
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totalBytesWritten: Int64,
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totalBytesExpectedToWrite: Int64) {
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guard let networkURL = downloadTask.currentRequest?.url,
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let index = runningURLs[networkURL] else {
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return
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}
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self.delegate?.notifyOfNetworkProgress(progress: "Bytes written: (totalBytesWritten) out of: (totalBytesExpectedToWrite)",
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operationIndex: index)
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}
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func urlSession(_ session: URLSession,
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task: URLSessionTask,
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didCompleteWithError error: Error?) {
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guard let networkURL = task.currentRequest?.url,
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let index = runningURLs[networkURL] else {
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return
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}
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// Remove the running task
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runningTasks.removeValue(forKey: networkURL)
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runningURLs.removeValue(forKey: networkURL)
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self.delegate?.notifyOfNetworkOperationCompletion(with: networkURL.absoluteString,
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fileURL: nil,
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operation Index: index, error: error)
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}
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}
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/*利用する場合*/
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class ViewController: UIViewController {
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@IBOutlet weak var testQueue: UIButton!
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override func viewDidLoad() {
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super.viewDidLoad()
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// Do any additional setup after loading the view.
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}
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@IBAction func testOperationQueue() {
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let urls = [
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"https:///xxxx/Test/1.jpg",
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"https:///xxxx/Test/2.jpg",
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"https:///xxxx/Test/3.jpg",
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"https:///xxxx/Test/4.jpg",
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"https:///xxxx/Test/5.jpg",
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"https:///xxxx/Test/6.jpg",
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"https:///xxxx/Test/7.jpg",
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"https:///xxxx/Test/8.jpg",
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"https:///xxxx/Test/9.jpg",
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]
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NetworkDownloader.shared.delegate = self
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var index = 1
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for url in urls {
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let nonCachedURL = "(url)"
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NetworkDownloader.shared.startDownloadTask(with: nonCachedURL, with: index)
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index += 1
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}
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}
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}
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extension ViewController: NetworkQueueDelegate {
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func notifyOfNetworkOperationCompletion(with url: String, fileURL: String?, operationIndex: Int, error: Error?) {
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guard let filePath = fileURL, error == nil else {
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print("Error from operation: (error?.localizedDescription ?? "No Error")")
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return
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}
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print("** Operation: (operationIndex) finished with downloaded file: (filePath)")
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}
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func notifyOfNetworkProgress(progress: String, operationIndex: Int) {
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print("-- Operation: (operationIndex) : (progress)")
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}
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}
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```
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