How to use viewWillAppear method of ViewController class

Best Swift-snapshot-testing code snippet using ViewController.viewWillAppear

SearchViewControllerSpec.swift

Source:SearchViewControllerSpec.swift Github

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...54 describe("when view appeared") {55 var titleView: SearchTitleView!56 57 beforeEach {58 viewController.viewWillAppear(false)59 60 titleView = viewController.navigationController!.navigationBar.subviews.last! as? SearchTitleView61 }62 63 it("needs to setup title view's delegate") {64 expect(titleView.delegate) === viewController65 }66 67 it("needs to setup title view's frame") {68 expect(titleView.frame.origin) == CGPoint(x: 8, y: 0)69 expect(titleView.frame.size) == CGSize(width: viewController.view.frame.size.width - 8 * 2, height: 44)70 }71 72 it("needs to setup title view's alpha") {73 expect(titleView.alpha) == 174 }75 76 it("needs to setup correct title bar tint color") {77 expect(viewController.navigationController?.navigationBar.barTintColor) == Colors.backgroundDefault78 }79 }80 81 describe("when view disappeared") {82 beforeEach {83 viewController.viewWillAppear(false)84 viewController.viewWillDisappear(false)85 }86 87 it("needs to setup correct title bar tint color") {88 expect(viewController.navigationController?.navigationBar.barTintColor) == UIColor.white89 }90 }91 92 describe("when title view's text changed") {93 it("needs to setup search phrase of view model") {94 viewController.viewWillAppear(false)95 96 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView97 titleView.textField.text = "phrase"98 titleView.textField.sendActions(for: .editingChanged)99 100 expect(viewModelMock.searchPhrase.value) == titleView.text101 }102 }103 104 describe("when data loaded") {105 context("if data is empty") {106 it("should have collection view without data") {107 viewModelMock.isNeedToReturnData = false108 viewModelMock.reloadData()109 110 expect(viewController.refreshControl?.isRefreshing) == false111 expect(viewController.collectionView.numberOfItems(inSection: 0)) == 0112 expect(viewController.collectionProvider.products.isEmpty) == true113 }114 }115 116 context("if data isn't empty") {117 it("should have collection view with data") {118 viewModelMock.isNeedToReturnData = true119 viewModelMock.reloadData()120 121 expect(viewController.refreshControl?.isRefreshing) == false122 expect(viewController.collectionView.numberOfItems(inSection: 0)) > 0123 expect(viewController.collectionProvider.products.isEmpty) == false124 }125 }126 }127 128 describe("when data refreshed or loaded next page") {129 it("should refresh data") {130 viewController.pullToRefreshHandler()131 132 expect(viewModelMock.isReloadDataStarted) == true133 }134 135 it("should load next page") {136 viewController.infinityScrollHandler()137 138 expect(viewModelMock.isLoadNextPageStarted) == true139 }140 }141 142 describe("when collection view item selected") {143 var titleView: SearchTitleView!144 145 beforeEach {146 viewController.viewWillAppear(false)147 148 viewModelMock.isNeedToReturnData = true149 viewModelMock.reloadData()150 151 titleView = viewController.navigationController!.navigationBar.subviews.last! as? SearchTitleView152 titleView.textField.sendActions(for: .editingDidBegin)153 154 let indexPath = IndexPath(item: 0, section: 0)155 viewController.collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .top)156 viewController.collectionView.delegate!.collectionView!(viewController.collectionView, didSelectItemAt: indexPath)157 }158 159 it("needs to end editing view") {160 expect(titleView.textField.isEditing) == false161 }162 163 it("needs to setup title view's alpha") {164 expect(titleView.alpha) == 0165 }166 167 it("needs to setup title view's alpha when user returns back") {168 viewController.viewWillAppear(false)169 170 expect(titleView.alpha) == 1171 }172 }173 174 describe("when category selected") {175 it("needs to setup title view's alpha") {176 viewController.viewWillAppear(false)177 178 let categoryListViewController = viewController.children.first! as! CategoryListViewController179 categoryListViewController.collectionProvider = CategoryListCollectionProvider()180 categoryListViewController.collectionProvider.delegate = categoryListViewController181 categoryListViewController.collectionView.dataSource = categoryListViewController.collectionProvider182 categoryListViewController.collectionView.delegate = categoryListViewController.collectionProvider183 184 let repositoryMock = CategoryRepositoryMock()185 let categoryListUseCaseMock = CategoryListUseCaseMock(repository: repositoryMock)186 let viewModelMock = CategoryListViewModelMock(categoryListUseCase: categoryListUseCaseMock)187 categoryListViewController.viewModel = viewModelMock188 viewModelMock.isNeedToReturnData = true189 viewModelMock.reloadData()190 191 categoryListViewController.collectionProvider.categories = viewModelMock.items.value192 categoryListViewController.collectionView.reloadData()193 194 let indexPath = IndexPath(item: 0, section: 0)195 categoryListViewController.collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .top)196 categoryListViewController.collectionView.delegate!.collectionView!(viewController.collectionView, didSelectItemAt: indexPath)197 198 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView199 200 expect(titleView.alpha) == 0201 }202 }203 204 describe("when title view editing begined") {205 it("needs to hide category list") {206 viewController.viewWillAppear(false)207 208 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView209 titleView.textField.sendActions(for: .editingDidBegin)210 211 expect(categoryListContainerView.alpha) == 0212 }213 }214 215 describe("when title view editing changed") {216 it("needs to reload search items") {217 viewController.viewWillAppear(false)218 219 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView220 titleView.textField.sendActions(for: .editingDidBegin)221 222 waitUntil(timeout: 2) { done in223 DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1), execute: {224 done()225 })226 }227 228 titleView.textField.text = "phrase"229 titleView.textField.sendActions(for: .editingChanged)230 231 expect(viewModelMock.isReloadDataStarted).toEventually(equal(true), timeout: 1, pollInterval: 0.3)232 }233 }234 235 describe("when title view's clear button pressed") {236 it("needs to clear search result") {237 viewController.viewWillAppear(false)238 239 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView240 let clearButton = self.findView(withAccessibilityLabel: "clear", in: titleView) as! UIButton241 clearButton.sendActions(for: .touchUpInside)242 243 expect(viewModelMock.isResultCleared) == true244 }245 }246 247 describe("when title view's back button pressed") {248 it("needs to clear search result and show category list") {249 viewController.viewWillAppear(false)250 251 let titleView = viewController.navigationController!.navigationBar.subviews.last! as! SearchTitleView252 let backButton = self.findView(withAccessibilityLabel: "back", in: titleView) as! UIButton253 backButton.sendActions(for: .touchUpInside)254 255 expect(viewModelMock.isResultCleared) == true256 expect(categoryListContainerView.alpha) == 1257 }258 }259 }260}...

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UIViewController+AddBehaviors.swift

Source: UIViewController+AddBehaviors.swift Github

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...10// 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 @available(*, unavailable)52 required init?(coder _: NSCoder) {53 fatalError("init(coder:) has not been implemented")54 }55 override func viewDidLoad() {56 super.viewDidLoad()57 view.isHidden = true58 applyBehaviors { behavior, viewController in59 behavior.viewDidLoad(viewController: viewController)60 }61 }62 override func viewWillAppear(_ animated: Bool) {63 super.viewWillAppear(animated)64 applyBehaviors { behavior, viewController in65 behavior.viewWillAppear(viewController: viewController)66 }67 }68 override func viewDidAppear(_ animated: Bool) {69 super.viewDidAppear(animated)70 applyBehaviors { behavior, viewController in71 behavior.viewDidAppear(viewController: viewController)72 }73 }74 override func viewWillDisappear(_ animated: Bool) {75 super.viewWillDisappear(animated)76 applyBehaviors { behavior, viewController in77 behavior.viewWillDisappear(viewController: viewController)78 }79 }...

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PresenterInterface.swift

Source:PresenterInterface.swift Github

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...6// Copyright © 2021 Iflet.tech. All rights reserved.7//8protocol PresenterInterface: class {9 func viewDidLoad()10 func viewWillAppear(animated: Bool)11 func viewDidAppear(animated: Bool)12 func viewWillDisappear(animated: Bool)13 func viewDidDisappear(animated: Bool)14}15// MARK: - Presenter Interface Helpers16/// PresenterInterface extra capabilities (for checking wether it's properly called on ViewController)17extension PresenterInterface {18 /// Throw an error if presenter called viewDidLoad but hasn't been called inside ViewController19 func viewDidLoad() {20 fatalError("viewDidLoad hasn't been called inside ViewController")21 }22 /// Throw an error if presenter called viewWillAppear but hasn't been called inside ViewController23 func viewWillAppear(animated: Bool) {24 fatalError("viewWillAppear hasn't been called inside ViewController")25 }26 /// Throw an error if presenter called viewDidAppear but hasn't been called inside ViewController27 func viewDidAppear(animated: Bool) {28 fatalError("viewDidAppear hasn't been called inside ViewController")29 }30 /// Throw an error if presenter called viewWillDisappear but hasn't been called inside ViewController31 func viewWillDisappear(animated: Bool) {32 fatalError("viewWillDisappear hasn't been called inside ViewController")33 }34 /// Throw an error if presenter called viewDidDisappear but hasn't been called inside ViewController35 func viewDidDisappear(animated: Bool) {36 fatalError("viewDidDisappear hasn't been called inside ViewController")37 }38}...

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viewWillAppear

Using AI Code Generation

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1import UIKit2class ViewController: UIViewController {3 override func viewDidLoad() {4 super.viewDidLoad()5 }6 override func viewWillAppear(_ animated: Bool) {7 super.viewWillAppear(animated)8 print("View Will Appear")9 }10}11import UIKit12class ViewController: UIViewController {13 override func viewDidLoad() {14 super.viewDidLoad()15 print("View Did Load")16 }17 override func viewWillAppear(_ animated: Bool) {18 super.viewWillAppear(animated)19 print("View Will Appear")20 }21}22import UIKit23class ViewController: UIViewController {24 override func viewDidLoad() {25 super.viewDidLoad()26 print("View Did Load")27 }28 override func viewWillAppear(_ animated: Bool) {29 super.viewWillAppear(animated)30 print("View Will Appear")31 }32 override func viewDidAppear(_ animated: Bool) {33 super.viewDidAppear(animated)34 print("View Did Appear")35 }36}37import UIKit38class ViewController: UIViewController {39 override func viewDidLoad() {40 super.viewDidLoad()41 print("View Did Load")42 }43 override func viewWillAppear(_ animated: Bool) {44 super.viewWillAppear(animated)45 print("View Will Appear")46 }47 override func viewDidAppear(_ animated: Bool) {48 super.viewDidAppear(animated)49 print("View Did Appear")50 }51 override func viewWillDisappear(_ animated: Bool) {52 super.viewWillDisappear(animated)53 print("View Will Disappear")54 }55}56import UIKit57class ViewController: UIViewController {58 override func viewDidLoad() {59 super.viewDidLoad()60 print("View Did Load")61 }62 override func viewWillAppear(_ animated: Bool) {63 super.viewWillAppear(animated)64 print("View Will Appear")65 }66 override func viewDidAppear(_ animated: Bool) {67 super.viewDidAppear(animated)68 print("View Did Appear")69 }

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viewWillAppear

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1import UIKit2class ViewController: UIViewController {3override func viewDidLoad() {4 super.viewDidLoad()5}6override func viewWillAppear(_ animated: Bool) {7 super.viewWillAppear(animated)8 print("viewWillAppear is called")9}10override func viewDidAppear(_ animated: Bool) {11 super.viewDidAppear(animated)12 print("viewDidAppear is called")13}14override func viewWillDisappear(_ animated: Bool) {15 super.viewWillDisappear(animated)16 print("viewWillDisappear is called")17}18override func viewDidDisappear(_ animated: Bool) {19 super.viewDidDisappear(animated)20 print("viewDidDisappear is called")21}22}23import UIKit24class ViewController: UIViewController {25override func viewDidLoad() {26 super.viewDidLoad()27}28override func viewWillAppear(_ animated: Bool) {29 super.viewWillAppear(animated)30 print("viewWillAppear is called")31}32override func viewDidAppear(_ animated: Bool) {33 super.viewDidAppear(animated)34 print("viewDidAppear is called")35}36override func viewWillDisappear(_ animated: Bool) {37 super.viewWillDisappear(animated)38 print("viewWillDisappear is called")39}40override func viewDidDisappear(_ animated: Bool) {41 super.viewDidDisappear(animated)42 print("viewDidDisappear is called")43}44}45import UIKit46class ViewController: UIViewController {47override func viewDidLoad() {48 super.viewDidLoad()49}50override func viewWillAppear(_ animated: Bool) {51 super.viewWillAppear(animated)52 print("viewWillAppear is called")53}54override func viewDidAppear(_ animated: Bool) {55 super.viewDidAppear(animated)56 print("viewDidAppear is called")57}58override func viewWillDisappear(_ animated: Bool) {59 super.viewWillDisappear(animated)60 print("viewWillDisappear is called")61}62override func viewDidDisappear(_ animated: Bool) {63 super.viewDidDisappear(animated)64 print("viewDidDisappear is called")65}66}67import UIKit68class ViewController: UIViewController {69override func viewDidLoad() {70 super.viewDidLoad()71}72override func viewWillAppear(_ animated: Bool) {73 super.viewWillAppear(animated)74 print("

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viewWillAppear

Using AI Code Generation

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1import UIKit2class ViewController: UIViewController {3 override func viewDidLoad() {4 super.viewDidLoad()5 }6 override func viewWillAppear(_ animated: Bool) {7 print("viewWillAppear")8 }9}10import UIKit11class ViewController: UIViewController {12 override func viewDidLoad() {13 super.viewDidLoad()14 }15 override func viewWillDisappear(_ animated: Bool) {16 print("viewWillDisappear")17 }18}19import UIKit20class ViewController: UIViewController {21 override func viewDidLoad() {22 super.viewDidLoad()23 }24 override func viewDidAppear(_ animated: Bool) {25 print("viewDidAppear")26 }27}28import UIKit29class ViewController: UIViewController {30 override func viewDidLoad() {31 super.viewDidLoad()32 }33 override func viewDidDisappear(_ animated: Bool) {34 print("viewDidDisappear")35 }36}37import UIKit38class ViewController: UIViewController {39 override func viewDidLoad() {40 super.viewDidLoad()41 }42 override func viewWillLayoutSubviews() {43 print("viewWillLayoutSubviews")44 }45}46import UIKit47class ViewController: UIViewController {48 override func viewDidLoad() {49 super.viewDidLoad()50 }51 override func viewDidLayoutSubviews() {52 print("viewDidLayoutSubviews")53 }54}55import UIKit56class ViewController: UIViewController {57 override func viewDidLoad() {58 super.viewDidLoad()59 }60 override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {61 print("viewWillTransition")62 }63}

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viewWillAppear

Using AI Code Generation

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1override func viewWillAppear(_ animated: Bool) {2 super.viewWillAppear(animated)3 print("viewWillAppear")4}5override func viewDidAppear(_ animated: Bool) {6 super.viewDidAppear(animated)7 print("viewDidAppear")8}9override func viewWillDisappear(_ animated: Bool) {10 super.viewWillDisappear(animated)11 print("viewWillDisappear")12}13override func viewDidDisappear(_ animated: Bool) {14 super.viewDidDisappear(animated)15 print("viewDidDisappear")16}17override func viewDidLoad() {18 super.viewDidLoad()19 print("viewDidLoad")20}21override func didReceiveMemoryWarning() {22 super.didReceiveMemoryWarning()23 print("didReceiveMemoryWarning")24}25override func loadView() {26 super.loadView()27 print("loadView")28}29override func viewWillLayoutSubviews() {30 super.viewWillLayoutSubviews()31 print("viewWillLayoutSubviews")32}33override func viewDidLayoutSubviews() {34 super.viewDidLayoutSubviews()35 print("viewDidLayoutSubviews")36}37override func viewDidLoad() {38 super.viewDidLoad()39 print("viewDidLoad")40}41override func viewWillAppear(_ animated: Bool) {42 super.viewWillAppear(animated)43 print("viewWillAppear")44}

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viewWillAppear

Using AI Code Generation

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1override func viewWillAppear(_ animated: Bool) {2 super.viewWillAppear(animated)3}4override func viewDidLoad() {5 super.viewDidLoad()6}7override func viewDidAppear(_ animated: Bool) {8 super.viewDidAppear(animated)9}10override func viewWillDisappear(_ animated: Bool) {11 super.viewWillDisappear(animated)12}13override func viewDidDisappear(_ animated: Bool) {14 super.viewDidDisappear(animated)15}16override func viewWillLayoutSubviews() {17 super.viewWillLayoutSubviews()18}19override func viewDidLayoutSubviews() {20 super.viewDidLayoutSubviews()21}22override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {23 super.viewWillTransition(to: size, with: coordinator)24}25override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {26 super.viewWillTransition(to: size, with: coordinator)27}28override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {29 super.viewWillTransition(to: size, with: coordinator)30}31override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {32 super.viewWillTransition(to: size, with: coordinator)33}34override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {35 super.viewWillTransition(to: size, with: coordinator)36}

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viewWillAppear

Using AI Code Generation

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

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viewWillAppear

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1override func viewWillAppear(_ animated: Bool) {2 super.viewWillAppear(animated)3 print("viewWillAppear")4}5override func viewDidAppear(_ animated: Bool) {6 super.viewDidAppear(animated)7 print("viewDidAppear")8}9override func viewDidLoad() {10 super.viewDidLoad()11 print("viewDidLoad")12}13override func viewWillDisappear(_ animated: Bool) {14 super.viewWillDisappear(animated)15 print("viewWillDisappear")16}17override func viewDidDisappear(_ animated: Bool) {18 super.viewDidDisappear(animated)19 print("viewDidDisappear")20}

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viewWillAppear

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1override func viewWillAppear(animated: Bool) {2 super.viewWillAppear(animated)3 if let index = self.tableView.indexPathForSelectedRow() {4 self.tableView.deselectRowAtIndexPath(index, animated: true)5 }6 }7override func viewDidAppear(animated: Bool) {8 super.viewDidAppear(animated)9 if let index = self.tableView.indexPathForSelectedRow() {10 self.tableView.deselectRowAtIndexPath(index, animated: true)11 }12 }13override func viewWillDisappear(animated: Bool) {14 super.viewWillDisappear(animated)15 if let index = self.tableView.indexPathForSelectedRow() {16 self.tableView.deselectRowAtIndexPath(index, animated: true)17 }18 }19override func viewDidDisappear(animated: Bool) {20 super.viewDidDisappear(animated)21 if let index = self.tableView.indexPathForSelectedRow() {22 self.tableView.deselectRowAtIndexPath(index, animated: true)23 }24 }25override func viewWillLayoutSubviews() {26 super.viewWillLayoutSubviews()27 if let index = self.tableView.indexPathForSelectedRow() {28 self.tableView.deselectRowAtIndexPath(index, animated: true)29 }30 }31override func viewDidLayoutSubviews() {32 super.viewDidLayoutSubviews()33 if let index = self.tableView.indexPathForSelectedRow() {34 self.tableView.deselectRowAtIndexPath(index, animated: true)35 }36 }37override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {38 super.willRotateToInterfaceOrientation(toInterfaceOrientation, duration: duration)39 if let index = self.tableView.indexPathForSelectedRow() {40 self.tableView.deselectRowAtIndexPath(index, animated: true)41 }42 }43override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {44 super.willAnimateRotationToInterfaceOrientation(toInterfaceOrientation

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viewWillAppear

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1override func viewWillAppear(_ animated: Bool) {2 super.viewWillAppear(animated)3}4override func viewWillDisappear(_ animated: Bool) {5 super.viewWillDisappear(animated)6}

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viewWillAppear

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1override func viewWillAppear(_ animated: Bool) {2 super.viewWillAppear(animated)3 let currentDate = Date()4 dateTextField.text = "\(currentDate)"5}6override func viewDidAppear(_ animated: Bool) {7 super.viewDidAppear(animated)8 let currentDate = Date()9 dateTextField.text = "\(currentDate)"10}11override func viewDidLoad() {12 super.viewDidLoad()13 let currentDate = Date()14 dateTextField.text = "\(currentDate)"15}

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