How to use viewDidLoad method of ViewController class

...42class ExitAlertController: UIAlertController {43    var onButtonTapped: (() -> ())?44    45    // ViewController lifecycle methods46    override func viewDidLoad() {47        super.viewDidLoad()48        setupButton()49    }50    51    // UI configure methods52    private func setupButton() {53        let agreeButton = UIAlertAction(title: "Нет", style: .default, handler: nil)54        let disagreeButton = UIAlertAction(title: "Да", style: .destructive) {[unowned self] _ in55            disagreeButtonTapped()56        }57        addAction(disagreeButton)58        addAction(agreeButton)59    }60    61    private func disagreeButtonTapped() {62        onButtonTapped?()63    }64}65class ErrorAlertController: UIAlertController {66    // ViewController lifecycle methods67    override func viewDidLoad() {68        super.viewDidLoad()69        setupButton()70    }71    72    // UI configure methods73    private func setupButton() {74        let reportButton = UIAlertAction(title: "Сообщить об ошибке", style: .default)75        addAction(reportButton)76    }77}78class AddSectionAlertController: UIAlertController {79    weak var delegate: AddSectionAlertDelegate?80    81    // ViewController lifecycle methods82    override func viewDidLoad() {83        super.viewDidLoad()84        setupButton()85        setupTextField()86    }87    88    // UI configure methods89    private func setupButton() {90        let addButton = UIAlertAction(title: "Добавить", style: .cancel) { [unowned self] _ in91            guard let text = self.textFields?[0].text else { return }92            self.delegate?.addNewSection(with: text)93        }94        addAction(addButton)95        96        let closeButton = UIAlertAction(title: "Отменить", style: .default)97        98        addAction(closeButton)99    }100    101    private func setupTextField() {102        addTextField { textField in103            textField.placeholder = "Работа"104        }105    }106}107class ChangeSectionAlertController: UIAlertController {108    weak var delegate: ChangeSectionAlertDelegate?109    var section: Int?110    111    // ViewController lifecycle methods112    override func viewDidLoad() {113        super.viewDidLoad()114        setupButton()115        setupTextField()116    }117    118    // UI configure methods119    private func setupButton() {120        let addButton = UIAlertAction(title: "Cохранить", style: .cancel) { [unowned self] _ in121            guard let text = self.textFields?[0].text,122                  let section = section123            else { return }124            125            self.delegate?.changeSection(with: section, text: text)126        }127        addAction(addButton)128        129        let closeButton = UIAlertAction(title: "Отменить", style: .default)130        131        addAction(closeButton)132    }133    134    private func setupTextField() {135        addTextField { textField in136            textField.placeholder = "Работа"137        }138    }139}140class DeleteSectionAlertController: UIAlertController {141    weak var delegate: DeleteAlertDelegate?142    var section: Int?143    144    // ViewController lifecycle methods145    override func viewDidLoad() {146        super.viewDidLoad()147        setupButton()148    }149    150    // UI configure methods151    private func setupButton() {152        let cancelButton = UIAlertAction(title: "Отменить", style: .cancel)153        let deleteButton = UIAlertAction(title: "Удалить", style: .destructive) { [unowned self] _ in154            guard let section = self.section else { return }155            self.delegate?.deleteSection(section)156        }157        addAction(cancelButton)158        addAction(deleteButton)159    }160    161}162class DeleteTaskAlertController: UIAlertController {163    var onButtonTapped: (() -> ())?164    165    // ViewController lifecycle methods166    override func viewDidLoad() {167        super.viewDidLoad()168        setupButton()169    }170    171    // UI configure methods172    private func setupButton() {173        let agreeButton = UIAlertAction(title: "Отменить", style: .default, handler: nil)174        let disagreeButton = UIAlertAction(title: "Удалить", style: .destructive) {[unowned self] _ in175            disagreeButtonTapped()176        }177        addAction(disagreeButton)178        addAction(agreeButton)179    }180    181    private func disagreeButtonTapped() {182        onButtonTapped?()183    }184}185class PleaseSignInAlertController: UIAlertController {186    // ViewController lifecycle methods187    override func viewDidLoad() {188        super.viewDidLoad()189        setupButton()190    }191    192    // UI configure methods193    private func setupButton() {194        let reportButton = UIAlertAction(title: "Хорошо", style: .default)195        addAction(reportButton)196    }197}...

...9// Where ViewController on didLoad adds behaviour which observes keyboard frame10// and scrollView content inset changes based on keyboard frame.11import UIKit12protocol ViewControllerLifecycleBehavior {13    func viewDidLoad(viewController: UIViewController)14    func viewWillAppear(viewController: UIViewController)15    func viewDidAppear(viewController: UIViewController)16    func viewWillDisappear(viewController: UIViewController)17    func viewDidDisappear(viewController: UIViewController)18    func viewWillLayoutSubviews(viewController: UIViewController)19    func viewDidLayoutSubviews(viewController: UIViewController)20}21// Default implementations22extension ViewControllerLifecycleBehavior {23    func viewDidLoad(viewController: UIViewController) {}24    func viewWillAppear(viewController: UIViewController) {}25    func viewDidAppear(viewController: UIViewController) {}26    func viewWillDisappear(viewController: UIViewController) {}27    func viewDidDisappear(viewController: UIViewController) {}28    func viewWillLayoutSubviews(viewController: UIViewController) {}29    func viewDidLayoutSubviews(viewController: UIViewController) {}30}31extension UIViewController {32    /*33     Add behaviors to be hooked into this view controller’s lifecycle.34     This method requires the view controller’s view to be loaded, so it’s best to call35     in `viewDidLoad` to avoid it being loaded prematurely.36     - parameter behaviors: Behaviors to be added.37     */38    func addBehaviors(_ behaviors: [ViewControllerLifecycleBehavior]) {39        let behaviorViewController = LifecycleBehaviorViewController(behaviors: behaviors)40        addChild(behaviorViewController)41        view.addSubview(behaviorViewController.view)42        behaviorViewController.didMove(toParent: self)43    }44    private final class LifecycleBehaviorViewController: UIViewController, UIGestureRecognizerDelegate {45        private let behaviors: [ViewControllerLifecycleBehavior]46        // MARK: - Lifecycle47        init(behaviors: [ViewControllerLifecycleBehavior]) {48            self.behaviors = behaviors49            super.init(nibName: nil, bundle: nil)50        }51        required init?(coder aDecoder: NSCoder) {52            fatalError("init(coder:) has not been implemented")53        }54        override func viewDidLoad() {55            super.viewDidLoad()56            view.isHidden = true57            applyBehaviors { behavior, viewController in58                behavior.viewDidLoad(viewController: viewController)59            }60        }61        override func viewWillAppear(_ animated: Bool) {62            super.viewWillAppear(animated)63            applyBehaviors { behavior, viewController in64                behavior.viewWillAppear(viewController: viewController)65            }66        }67        override func viewDidAppear(_ animated: Bool) {68            super.viewDidAppear(animated)69            applyBehaviors { behavior, viewController in70                behavior.viewDidAppear(viewController: viewController)71            }72        }...

...25        viewController = nil26    }27    28    func testViewDidLoad() {29        viewController.viewDidLoad()30        XCTAssertNotNil(viewController.view)31    }32    33    func testViewWillAppear() {34        viewController.viewDidLoad()35        viewController.viewWillAppear(true)36        XCTAssertTrue(presenterMock.viewWillAppearCalled)37    }38    39    func testUpdateView() {40        viewController.viewDidLoad()41        viewController.viewWillAppear(true)42        viewController.updateView()43        XCTAssertEqual(viewController.title, "Smart Investing")44    }45    46    func testTableViewHasDelegate() {47        viewController.viewDidLoad()48        XCTAssertNotNil(viewController.achievementsTableView.delegate)49    }50    51    func testTableViewHasDataSource() {52        viewController.viewDidLoad()53        XCTAssertNotNil(viewController.achievementsTableView.dataSource)54    }55    56    func testTableViewConformsToTableViewDataSourceProtocol() {57        viewController.viewDidLoad()58        XCTAssertTrue(viewController.conforms(to: UITableViewDataSource.self))59        XCTAssertTrue(viewController.responds(to: #selector(viewController.tableView(_:numberOfRowsInSection:))))60        XCTAssertTrue(viewController.responds(to: #selector(viewController.tableView(_:cellForRowAt:))))61    }62    63    func testTableViewConfromsToTableViewDelegateProtocol() {64        viewController.viewDidLoad()65        XCTAssertTrue(viewController.conforms(to: UITableViewDelegate.self))66        XCTAssertTrue(viewController.responds(to: #selector(viewController.tableView(_:willDisplay:forRowAt:))))67    }68    69    func testTableViewCellHasReuseIdentifier() {70        viewController.viewDidLoad()71        let cell = viewController.tableView(viewController.achievementsTableView, cellForRowAt: IndexPath(row: 0, section: 0)) as? AchievementTableViewCell72        let actualReuseIdentifer = cell?.reuseIdentifier73        let expectedReuseIdentifier = "AchievementCellIdentifier"74        XCTAssertEqual(actualReuseIdentifer, expectedReuseIdentifier)75    }76    77    func testNoOfRowsInTableView() {78        viewController.viewDidLoad()79        let rows = viewController.tableView(viewController.achievementsTableView, numberOfRowsInSection: 0)80        XCTAssertGreaterThan(rows, 0)81    }82    83    func testTableViewCellForIndexPath() {84        // Given85        let expectedModel = presenterMock.achievementUIModel(for: 0)86        // When87        viewController.viewDidLoad()88        let cell = viewController.tableView(viewController.achievementsTableView, cellForRowAt: IndexPath(row: 1, section: 0)) as? AchievementTableViewCell89        // Then90        XCTAssertEqual(cell?.levelLabel.text, expectedModel.level)91        XCTAssertEqual(cell?.completedPointsLabel.text, "10pts")92        XCTAssertEqual(cell?.alpha, 1.0)93    }94}...

1class ViewController: UIViewController {2    override func viewDidLoad() {3        super.viewDidLoad()4    }5}6class ViewController: UIViewController {7    override func viewDidLoad() {8        super.viewDidLoad()9    }10}11class ViewController: UIViewController {12    override func viewDidLoad() {13        super.viewDidLoad()14    }15}16class ViewController: UIViewController {17    override func viewDidLoad() {18        super.viewDidLoad()19    }20}21class ViewController: UIViewController {22    override func viewDidLoad() {23        super.viewDidLoad()24    }25}26class ViewController: UIViewController {27    override func viewDidLoad() {28        super.viewDidLoad()29    }30}31class ViewController: UIViewController {32    override func viewDidLoad() {33        super.viewDidLoad()34    }35}36class ViewController: UIViewController {37    override func viewDidLoad() {38        super.viewDidLoad()39    }40}41class ViewController: UIViewController {42    override func viewDidLoad() {43        super.viewDidLoad()44    }45}46class ViewController: UIViewController {47    override func viewDidLoad() {48        super.viewDidLoad()49    }50}51class ViewController: UIViewController {52    override func viewDidLoad() {53        super.viewDidLoad()54    }55}

1class ViewController: UIViewController {2    override func viewDidLoad() {3        super.viewDidLoad()4    }5}6class ViewController: UIViewController {7    override func viewDidLoad() {8        super.viewDidLoad()9    }10}11class ViewController: UIViewController {12    override func viewDidLoad() {13        super.viewDidLoad()14    }15}16extension ViewController {17}

1import UIKit2class ViewController: UIViewController {3  override func viewDidLoad() {4    super.viewDidLoad()5  }6}7import UIKit8class ViewController: UIViewController {9  override func viewDidLayoutSubviews() {10    super.viewDidLayoutSubviews()11  }12}13import UIKit14class ViewController: UIViewController {15  override func viewDidAppear(_ animated: Bool) {16    super.viewDidAppear(animated)17  }18}19import UIKit20class ViewController: UIViewController {21  override func viewWillAppear(_ animated: Bool) {22    super.viewWillAppear(animated)23  }24}25import UIKit26class ViewController: UIViewController {27  override func viewWillDisappear(_ animated: Bool) {28    super.viewWillDisappear(animated)29  }30}31import UIKit32class ViewController: UIViewController {33  override func viewDidDisappear(_ animated: Bool) {34    super.viewDidDisappear(animated)35  }36}37import UIKit38class ViewController: UIViewController {39  override func didReceiveMemoryWarning() {40    super.didReceiveMemoryWarning()41  }42}43import UIKit44class ViewController: UIViewController {45  override func viewWillLayoutSubviews() {46    super.viewWillLayoutSubviews()47  }48}49import UIKit50class ViewController: UIViewController {51  override func viewWillTransition(to size: CGSize

1import UIKit2class ViewController: UIViewController {3    override func viewDidLoad() {4        super.viewDidLoad()5    }6}7import UIKit8class ViewController: UIViewController {9    override func viewDidLoad() {10        super.viewDidLoad()11    }12}13import UIKit14class ViewController: UIViewController {15    override func viewDidLoad() {16        super.viewDidLoad()17    }18}19import UIKit20class ViewController: UIViewController {21    override func viewDidLoad() {22        super.viewDidLoad()23    }24}25import UIKit26class ViewController: UIViewController {27    override func viewDidLoad() {28        super.viewDidLoad()29    }30}31import UIKit32class ViewController: UIViewController {33    override func viewDidLoad() {34        super.viewDidLoad()35    }36}37import UIKit38class ViewController: UIViewController {39    override func viewDidLoad() {40        super.viewDidLoad()41    }42}43import UIKit44class ViewController: UIViewController {45    override func viewDidLoad() {46        super.viewDidLoad()47    }48}49import UIKit50class ViewController: UIViewController {51    override func viewDidLoad() {52        super.viewDidLoad()53    }54}55import UIKit56class ViewController: UIViewController {57    override func viewDidLoad() {58        super.viewDidLoad()59    }60}61import UIKit62class ViewController: UIViewController {

1import UIKit2class ViewController: UIViewController {3    override func viewDidLoad() {4        super.viewDidLoad()5        print("Hello World!")6    }7    override func didReceiveMemoryWarning() {8        super.didReceiveMemoryWarning()9    }10}11import UIKit12class ViewController: UIViewController {13    override func viewDidLoad() {14        super.viewDidLoad()15        print("Hello World!")16    }17    override func didReceiveMemoryWarning() {18        super.didReceiveMemoryWarning()19    }20}21import UIKit22class ViewController: UIViewController {23    override func viewDidLoad() {24        super.viewDidLoad()25        print("Hello World!")26    }27    override func didReceiveMemoryWarning() {28        super.didReceiveMemoryWarning()29    }30}31import UIKit32class ViewController: UIViewController {33    override func viewDidLoad() {34        super.viewDidLoad()35        print("Hello World!")36    }37    override func didReceiveMemoryWarning() {38        super.didReceiveMemoryWarning()39    }40}41import UIKit42class ViewController: UIViewController {43    override func viewDidLoad() {44        super.viewDidLoad()45        print("Hello World!")46    }47    override func didReceiveMemoryWarning() {48        super.didReceiveMemoryWarning()49    }50}51import UIKit52class ViewController: UIViewController {53    override func viewDidLoad() {54        super.viewDidLoad()55        print("Hello World!")56    }57    override func didReceiveMemoryWarning() {58        super.didReceiveMemoryWarning()59    }60}

1override func viewDidLoad() {2    super.viewDidLoad()3    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)4    backgroundImage.image = UIImage(named: "background.png")5    self.view.insertSubview(backgroundImage, at: 0)6}7override func viewDidLoad() {8    super.viewDidLoad()9    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)10    backgroundImage.image = UIImage(named: "background.png")11    self.view.insertSubview(backgroundImage, at: 0)12}13override func viewDidLoad() {14    super.viewDidLoad()15    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)16    backgroundImage.image = UIImage(named: "background.png")17    self.view.insertSubview(backgroundImage, at: 0)18}19override func viewDidLoad() {20    super.viewDidLoad()21    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)22    backgroundImage.image = UIImage(named: "background.png")23    self.view.insertSubview(backgroundImage, at: 0)24}25override func viewDidLoad() {26    super.viewDidLoad()27    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)28    backgroundImage.image = UIImage(named: "background.png")29    self.view.insertSubview(backgroundImage, at: 0)30}31override func viewDidLoad() {32    super.viewDidLoad()33    let backgroundImage = UIImageView(frame: UIScreen.main.bounds)34    backgroundImage.image = UIImage(named: "background.png")35    self.view.insertSubview(backgroundImage, at: 0)36}37override func viewDidLoad() {38    super.viewDidLoad()