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Исследуем жизненный цикл ViewController
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| final class ViewController: UIViewController { | |
| private let name = "🖥️" | |
| private let infoLabel: UILabel = { | |
| let label = UILabel() | |
| label.text = "AppDelegate Life Cycle" | |
| label.translatesAutoresizingMaskIntoConstraints = false | |
| return label | |
| }() | |
| private let switchButton: UIButton = { | |
| let button = UIButton(type: .system) | |
| button.setTitle("Switch to Second VC", for: .normal) | |
| button.translatesAutoresizingMaskIntoConstraints = false | |
| return button | |
| }() | |
| init() { | |
| super.init(nibName: nil, bundle: nil) | |
| Logger.shared.log("\(name) - 1) \(#function)") | |
| } | |
| required init?(coder: NSCoder) { | |
| fatalError("init(coder:) has not been implemented") | |
| } | |
| override func loadView() { | |
| Logger.shared.log("\(name) - 2) \(#function)") | |
| view = UIView() | |
| } | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| Logger.shared.log("\(name) - 3) \(#function)") | |
| view.backgroundColor = .blue | |
| view.addSubview(infoLabel) | |
| view.addSubview(switchButton) | |
| // Настройка автолэйаута для infoLabel и switchButton | |
| NSLayoutConstraint.activate([ | |
| infoLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor), | |
| infoLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor), | |
| switchButton.centerXAnchor.constraint(equalTo: view.centerXAnchor), | |
| switchButton.topAnchor.constraint(equalTo: infoLabel.bottomAnchor, constant: 20) | |
| ]) | |
| switchButton.addTarget(self, action: #selector(switchToSecondVC), for: .touchUpInside) | |
| } | |
| @objc private func switchToSecondVC() { | |
| let secondVC = SecondViewController() | |
| navigationController?.pushViewController(secondVC, animated: true) | |
| } | |
| override func viewWillAppear(_ animated: Bool) { | |
| super.viewWillAppear(animated) | |
| Logger.shared.log("\(name) - 4) \(#function)") | |
| } | |
| override func viewWillLayoutSubviews() { | |
| super.viewWillLayoutSubviews() | |
| Logger.shared.log("\(name) - 5) \(#function)") | |
| } | |
| override func viewDidLayoutSubviews() { | |
| super.viewDidLayoutSubviews() | |
| Logger.shared.log("\(name) - 6) \(#function)") | |
| } | |
| override func viewDidAppear(_ animated: Bool) { | |
| super.viewDidAppear(animated) | |
| Logger.shared.log("\(name) - 7) \(#function)") | |
| } | |
| override func viewWillDisappear(_ animated: Bool) { | |
| super.viewWillDisappear(animated) | |
| Logger.shared.log("\(name) - 8) \(#function)") | |
| } | |
| override func viewDidDisappear(_ animated: Bool) { | |
| super.viewDidDisappear(animated) | |
| Logger.shared.log("\(name) - 9) \(#function)") | |
| } | |
| deinit { | |
| Logger.shared.log("\(name) - 10) \(#function)") | |
| } | |
| } |
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| final class SecondViewController: UIViewController { | |
| private let name = "🖥️🖥️" | |
| init() { | |
| super.init(nibName: nil, bundle: nil) | |
| Logger.shared.log("\(name) - 1) \(#function)") | |
| } | |
| required init?(coder: NSCoder) { | |
| fatalError("init(coder:) has not been implemented") | |
| } | |
| override func loadView() { | |
| Logger.shared.log("\(name) - 2) \(#function)") | |
| view = UIView() | |
| view.backgroundColor = .green | |
| } | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| Logger.shared.log("\(name) - 3) \(#function)") | |
| } | |
| override func viewWillAppear(_ animated: Bool) { | |
| super.viewWillAppear(animated) | |
| Logger.shared.log("\(name) - 4) \(#function)") | |
| } | |
| override func viewWillLayoutSubviews() { | |
| super.viewWillLayoutSubviews() | |
| Logger.shared.log("\(name) - 5) \(#function)") | |
| } | |
| override func viewDidLayoutSubviews() { | |
| super.viewDidLayoutSubviews() | |
| Logger.shared.log("\(name) - 6) \(#function)") | |
| } | |
| override func viewDidAppear(_ animated: Bool) { | |
| super.viewDidAppear(animated) | |
| Logger.shared.log("\(name) - 7) \(#function)") | |
| } | |
| override func viewWillDisappear(_ animated: Bool) { | |
| super.viewWillDisappear(animated) | |
| Logger.shared.log("\(name) - 8) \(#function)") | |
| } | |
| override func viewDidDisappear(_ animated: Bool) { | |
| super.viewDidDisappear(animated) | |
| Logger.shared.log("\(name) - 9) \(#function)") | |
| } | |
| deinit { | |
| Logger.shared.log("\(name) - 10) \(#function)") | |
| } | |
| } |
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