How to use viewWillDisappear method of CancellingWKWebViewNavigationDelegate class

...750    class ViewController: UIViewController {751      let viewDidLoadExpectation: XCTestExpectation752      let viewWillAppearExpectation: XCTestExpectation753      let viewDidAppearExpectation: XCTestExpectation754      let viewWillDisappearExpectation: XCTestExpectation755      let viewDidDisappearExpectation: XCTestExpectation756      init(viewDidLoadExpectation: XCTestExpectation,757           viewWillAppearExpectation: XCTestExpectation,758           viewDidAppearExpectation: XCTestExpectation,759           viewWillDisappearExpectation: XCTestExpectation,760           viewDidDisappearExpectation: XCTestExpectation){761        self.viewDidLoadExpectation = viewDidLoadExpectation762        self.viewWillAppearExpectation = viewWillAppearExpectation763        self.viewDidAppearExpectation = viewDidAppearExpectation764        self.viewWillDisappearExpectation = viewWillDisappearExpectation765        self.viewDidDisappearExpectation = viewDidDisappearExpectation766        super.init(nibName: nil, bundle: nil)767      }768      required init?(coder: NSCoder) {769        fatalError("init(coder:) has not been implemented")770      }771      override func viewDidLoad() {772        super.viewDidLoad()773        viewDidLoadExpectation.fulfill()774      }775      override func viewWillAppear(_ animated: Bool) {776        super.viewWillAppear(animated)777        viewWillAppearExpectation.fulfill()778      }779      override func viewDidAppear(_ animated: Bool) {780        super.viewDidAppear(animated)781        viewDidAppearExpectation.fulfill()782      }783      override func viewWillDisappear(_ animated: Bool) {784        super.viewWillDisappear(animated)785        viewWillDisappearExpectation.fulfill()786      }787      override func viewDidDisappear(_ animated: Bool) {788        super.viewDidDisappear(animated)789        viewDidDisappearExpectation.fulfill()790      }791    }792    let viewDidLoadExpectation = expectation(description: "viewDidLoad")793    let viewWillAppearExpectation = expectation(description: "viewWillAppear")794    let viewDidAppearExpectation = expectation(description: "viewDidAppear")795    let viewWillDisappearExpectation = expectation(description: "viewWillDisappear")796    let viewDidDisappearExpectation = expectation(description: "viewDidDisappear")797    viewWillAppearExpectation.expectedFulfillmentCount = 4798    viewDidAppearExpectation.expectedFulfillmentCount = 4799    viewWillDisappearExpectation.expectedFulfillmentCount = 4800    viewDidDisappearExpectation.expectedFulfillmentCount = 4801    let viewController = ViewController(802      viewDidLoadExpectation: viewDidLoadExpectation,803      viewWillAppearExpectation: viewWillAppearExpectation,804      viewDidAppearExpectation: viewDidAppearExpectation,805      viewWillDisappearExpectation: viewWillDisappearExpectation,806      viewDidDisappearExpectation: viewDidDisappearExpectation807    )808    assertSnapshot(matching: viewController, as: .image)809    assertSnapshot(matching: viewController, as: .image)810    wait(for: [811      viewDidLoadExpectation,812      viewWillAppearExpectation,813      viewDidAppearExpectation,814      viewWillDisappearExpectation,815      viewDidDisappearExpectation,816    ], timeout: 1.0, enforceOrder: true)817    #endif818  }819  func testCALayer() {820    #if os(iOS)821    let layer = CALayer()822    layer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)823    layer.backgroundColor = UIColor.red.cgColor824    layer.borderWidth = 4.0825    layer.borderColor = UIColor.black.cgColor826    assertSnapshot(matching: layer, as: .image)827    #endif828  }...

...428        class ViewController: UIViewController {429            let viewDidLoadExpectation: XCTestExpectation430            let viewWillAppearExpectation: XCTestExpectation431            let viewDidAppearExpectation: XCTestExpectation432            let viewWillDisappearExpectation: XCTestExpectation433            let viewDidDisappearExpectation: XCTestExpectation434            init(435                viewDidLoadExpectation: XCTestExpectation,436                viewWillAppearExpectation: XCTestExpectation,437                viewDidAppearExpectation: XCTestExpectation,438                viewWillDisappearExpectation: XCTestExpectation,439                viewDidDisappearExpectation: XCTestExpectation440            ) {441                self.viewDidLoadExpectation = viewDidLoadExpectation442                self.viewWillAppearExpectation = viewWillAppearExpectation443                self.viewDidAppearExpectation = viewDidAppearExpectation444                self.viewWillDisappearExpectation = viewWillDisappearExpectation445                self.viewDidDisappearExpectation = viewDidDisappearExpectation446                super.init(nibName: nil, bundle: nil)447            }448            @available(*, unavailable)449            required init?(coder _: NSCoder) {450                fatalError("init(coder:) has not been implemented")451            }452            override func viewDidLoad() {453                super.viewDidLoad()454                viewDidLoadExpectation.fulfill()455            }456            override func viewWillAppear(_ animated: Bool) {457                super.viewWillAppear(animated)458                viewWillAppearExpectation.fulfill()459            }460            override func viewDidAppear(_ animated: Bool) {461                super.viewDidAppear(animated)462                viewDidAppearExpectation.fulfill()463            }464            override func viewWillDisappear(_ animated: Bool) {465                super.viewWillDisappear(animated)466                viewWillDisappearExpectation.fulfill()467            }468            override func viewDidDisappear(_ animated: Bool) {469                super.viewDidDisappear(animated)470                viewDidDisappearExpectation.fulfill()471            }472        }473        let viewDidLoadExpectation = expectation(description: "viewDidLoad")474        let viewWillAppearExpectation = expectation(description: "viewWillAppear")475        let viewDidAppearExpectation = expectation(description: "viewDidAppear")476        let viewWillDisappearExpectation = expectation(description: "viewWillDisappear")477        let viewDidDisappearExpectation = expectation(description: "viewDidDisappear")478        viewWillAppearExpectation.expectedFulfillmentCount = 2479        viewDidAppearExpectation.expectedFulfillmentCount = 2480        viewWillDisappearExpectation.expectedFulfillmentCount = 2481        viewDidDisappearExpectation.expectedFulfillmentCount = 2482        let viewController = ViewController(483            viewDidLoadExpectation: viewDidLoadExpectation,484            viewWillAppearExpectation: viewWillAppearExpectation,485            viewDidAppearExpectation: viewDidAppearExpectation,486            viewWillDisappearExpectation: viewWillDisappearExpectation,487            viewDidDisappearExpectation: viewDidDisappearExpectation488        )489        assertSnapshot(matching: viewController, as: .image)490        assertSnapshot(matching: viewController, as: .image)491        wait(492            for: [493                viewDidLoadExpectation,494                viewWillAppearExpectation,495                viewDidAppearExpectation,496                viewWillDisappearExpectation,497                viewDidDisappearExpectation498            ],499            timeout: 1,500            enforceOrder: true501        )502    }503    func testCALayer() {504        let layer = CALayer()505        layer.frame = CGRect(x: 0, y: 0, width: 100, height: 100)506        layer.backgroundColor = UIColor.red.cgColor507        layer.borderWidth = 4.0508        layer.borderColor = UIColor.black.cgColor509        assertSnapshot(matching: layer, as: .image)510    }...

1override func viewWillDisappear(_ animated: Bool) {2    super.viewWillDisappear(animated)3    webView?.stopLoading()4}5override func viewWillDisappear(_ animated: Bool) {6    super.viewWillDisappear(animated)7    webView?.stopLoading()8}9override func viewWillDisappear(_ animated: Bool) {10    super.viewWillDisappear(animated)11    webView?.stopLoading()12}13override func viewWillDisappear(_ animated: Bool) {14    super.viewWillDisappear(animated)15    webView?.stopLoading()16}17override func viewWillDisappear(_ animated: Bool) {18    super.viewWillDisappear(animated)19    webView?.stopLoading()20}21override func viewWillDisappear(_ animated: Bool) {22    super.viewWillDisappear(animated)23    webView?.stopLoading()24}25override func viewWillDisappear(_ animated: Bool) {26    super.viewWillDisappear(animated)27    webView?.stopLoading()28}29override func viewWillDisappear(_ animated: Bool) {30    super.viewWillDisappear(animated)31    webView?.stopLoading()32}33override func viewWillDisappear(_ animated: Bool) {34    super.viewWillDisappear(animated)35    webView?.stopLoading()36}37override func viewWillDisappear(_ animated: Bool) {38    super.viewWillDisappear(animated)

1import UIKit2import WebKit3class ViewController: UIViewController {4    override func viewDidLoad() {5        super.viewDidLoad()6        webView.navigationDelegate = CancellingWKWebViewNavigationDelegate()7        webView.load(request)8    }9    override func viewWillDisappear(_ animated: Bool) {10        super.viewWillDisappear(animated)11        webView.stopLoading()12    }13}14class CancellingWKWebViewNavigationDelegate: NSObject, WKNavigationDelegate {15    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {16        print("Start loading")17    }18    func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {19        print("Commit loading")20    }21    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {22        print("Finish loading")23    }24    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) {25        print("Fail loading")26    }27}