viewWillDisappear

最新推荐文章于 2024-03-28 09:46:04 发布
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本文深入探讨了iOS应用中视图的生命周期管理，包括viewWillAppear、viewDidAppear、viewWillDisappear等方法的作用，以及在屏幕黑屏锁屏后如何避免触发viewWillDisappear事件。

viewWillAppear: 
Called when the view is about to made visible. Default doesnothing
视图即将可见时调用。默认情况下不执行任何操作
viewDidAppear: 
Called when the view has been fully transitioned onto the screen.Default does nothing
视图已完全过渡到屏幕上时调用
viewWillDisappear:
Called when the view is dismissed, covered or otherwise hidden.Default does nothing
视图被驳回时调用，覆盖或以其他方式隐藏。默认情况下不执行任何操作



viewWillDisappear

在屏幕变黑锁屏后，并不会触发这个事件


【iOS知识学习】_视图控制对象生命周期-init、viewDidLoad、viewWillAppear、viewDidAppear、viewWillDisappear等的区别及用途
weasleyqi的专栏
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sunbo1591的专栏
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产生原因是用了UINavigationController. 将UINavigationController的view作为subview添加到了其他viewController的view中。 或者把UINavigationController添加到UITabbarController中了。 此时，NavigationController的stack里面的viewController就收不...
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12-14 307
http://www.cocoachina.com/ios/20151214/14596.html 在了解控制器的生命周期之后，我们都知道viewWillAppear:方法是在控制器的view将要显示的时候调用的，而viewWillDisappear:方法是在控制器的view将要隐藏的时候调用。很多时候我们根据自身需要将相关代码逻辑添加到这两个方法中，我们看下如下代码片段： 监听键盘...
iOS中viewDidLoad, viewWillDisappear, viewWillAppear等加载顺序
你有故事，我囿酒
12-24 7873
viewDidLoad, viewWillDisappear, viewWillAppear等加载顺序     当一个视图控制器被创建，并在屏幕上显示的时候。 代码的执行顺序               1、 alloc                                   创建对象，分配空间               2、init (in
这几个函数是什么意思：override func viewDidLoad() { super.viewDidLoad() outlineView.expandItem(CameraItem, expandChildren: true) if appContext.isCloudLogin && !appContext.isVmsLogin { NotificationCenter.default.addObserver(self, selector: #selector(handleNotifications(notification:)), name: .TPSSEvent, object: nil) } } override func viewWillAppear() { super.viewWillAppear() deviceListManager.loadDevices() deviceListManager.refreshDeviceList() outlineView.reloadData() } override func viewDidAppear() { super.viewDidAppear() scrollView.layoutSubtreeIfNeeded() outlineView.sizeLastColumnToFit() outlineView.reloadData() outlineView.layoutSubtreeIfNeeded() } override func viewWillDisappear() { super.viewWillDisappear() }
09-27
| `viewWillDisappear()` | 每次离开 | ✅ 正在隐藏 | 清理资源、保存状态 | --- ## ✅ 设计模式总结 | 技巧 | 实现方式 | |------|----------| | 数据刷新 | `viewWillAppear` 中调用 manager 刷新 | | 实时通信...
import UIKit class FlowingImageViewController: UIViewController { private let containerView: UIView = { let view = UIView() view.backgroundColor = UIColor.clear view.layer.borderWidth = 2.0 view.layer.borderColor = UIColor.white.withAlphaComponent(0.5).cgColor view.layer.cornerRadius = 10 view.clipsToBounds = true view.translatesAutoresizingMaskIntoConstraints = false return view }() private let imageView: UIImageView = { let imageView = UIImageView() imageView.contentMode = .scaleAspectFill imageView.translatesAutoresizingMaskIntoConstraints = false return imageView }() private var animator: UIViewPropertyAnimator? private var imageSize: CGSize = .zero private var containerSize: CGSize = .zero override func viewDidLoad() { super.viewDidLoad() setupViews() setupImage() } override func viewDidAppear(_ animated: Bool) { super.viewDidAppear(animated) startAnimation() } override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) stopAnimation() } private func setupViews() { view.backgroundColor = .black view.addSubview(containerView) containerView.addSubview(imageView) NSLayoutConstraint.activate([ containerView.centerXAnchor.constraint(equalTo: view.centerXAnchor), containerView.centerYAnchor.constraint(equalTo: view.centerYAnchor), containerView.widthAnchor.constraint(equalToConstant: 300), containerView.heightAnchor.constraint(equalToConstant: 200) ]) } private func setupImage() { // 使用示例图片，你可以替换为你自己的图片 if let image = UIImage(named: "sampleImage") ?? UIImage(systemName: "photo") { imageView.image = image imageSize = image.size containerSize = CGSize(width: 300, height: 200) // 初始位置 - 居中 let initialX = (containerSize.width - imageSize.width) / 2 let initialY = (containerSize.height - imageSize.height) / 2 imageView.frame = CGRect(x: initialX, y: initialY, width: imageSize.width, height: imageSize.height) } } private func startAnimation() { stopAnimation() // 确保没有正在运行的动画 // 计算动画路径 let horizontalRange = imageSize.width - containerSize.width let verticalRange = imageSize.height - containerSize.height // 创建动画 animator = UIViewPropertyAnimator(duration: 10.0, curve: .easeInOut) { // 水平移动 if horizontalRange > 0 { let randomX = CGFloat.random(in: -horizontalRange...0) self.imageView.frame.origin.x = randomX } // 垂直移动 if verticalRange > 0 { let randomY = CGFloat.random(in: -verticalRange...0) self.imageView.frame.origin.y = randomY } } animator?.addCompletion { _ in // 动画完成后重新开始 self.startAnimation() } animator?.startAnimation() } private func stopAnimation() { animator?.stopAnimation(true) animator = nil } // 添加手势可以暂停/继续动画 @objc private func toggleAnimation() { if let animator = animator { if animator.isRunning { animator.pauseAnimation() } else { animator.startAnimation() } } else { startAnimation() } } }
09-18
override func viewWillDisappear(_ animated: Bool) { super.viewWillDisappear(animated) stopAnimation() } private func setupViews() { view.backgroundColor = .black view.addSubview(container...
// // TPGuardDeviceShareMessageController.swift // OmadaSurveillance // // Created by 18908757-BG on 2025/6/3. // import Cocoa class TPGuardDeviceShareMessageController: TPBaseViewController { private var titleLabel = TPBLabel() private var foldButton = TPBButton.iconButton(with: .messageFoldButton) private var closeButton = TPBButton.iconButton(with: .messageCloseButton) private var messageListView = TPGuardMessageListView() private var scrollView = NSScrollView() private var isExpanded = true { didSet { isExpanded.toggle() messageListView.toggleCollapseState() } } override func viewDidLoad() { super.viewDidLoad() // Do view setup here. } override func viewWillAppear() { super.viewWillAppear() messageListView.deviceShareMessages = TPGuardMessageManager.shard.deviceShareMessages NotificationCenter.default.addObserver(self, selector: #selector(messageListDidChange), name: TPGuardNewDeviceShareMessageDidReceiveNotification, object: nil) } override func viewWillDisappear() { super.viewWillDisappear() NotificationCenter.default.removeObserver(self, name: TPGuardNewDeviceShareMessageDidReceiveNotification, object: nil) } @objc func messageListDidChange() { messageListView.deviceShareMessages = TPGuardMessageManager.shard.deviceShareMessages } override func viewDidAppear() { super.viewDidAppear() messageListView.reloadMessages() } override func setupSubviews() { super.setupSubviews() view.wantsLayer = true view.layer?.backgroundColor = NSColor.clear.cgColor titleLabel.font = NSFont.tpm16Medium() titleLabel.textColor = NSColor.tpTextWhite titleLabel.textAlignment = .natural scrollView.backgroundColor = NSColor.clear scrollView.drawsBackground = false scrollView.wantsLayer = true scrollView.layer?.backgroundColor = NSColor.clear.cgColor scrollView.contentView.backgroundColor = NSColor.clear scrollView.documentView = messageListView messageListView.autoresizingMask = [] messageListView.wantsLayer = true messageListView.layer?.masksToBounds = true messageListView.messageListViewStatusDidChangeCallback = { [weak self] height, collapsed in if collapsed { self?.titleLabel.isHidden = true self?.foldButton.isHidden = true self?.closeButton.isHidden = true self?.scrollView.snp.remakeConstraints { make in make.top.equalToSuperview().offset(10) make.leading.equalToSuperview().offset(24) make.trailing.equalToSuperview().offset(-24) make.width.equalTo(420) make.height.equalTo(height) } } else { self?.titleLabel.isHidden = false self?.foldButton.isHidden = false self?.closeButton.isHidden = false let newHeight = min(height, (self?.view.window?.contentView?.bounds.height ?? 0) - 42 - 70 - 56) self?.scrollView.snp.remakeConstraints { make in make.top.equalToSuperview().offset(42) make.leading.equalToSuperview().offset(24) make.trailing.equalToSuperview().offset(-24) make.width.equalTo(420) make.height.equalTo(newHeight) } } } view.addSubview(titleLabel) view.addSubview(foldButton) view.addSubview(closeButton) view.addSubview(scrollView) } override func setupInitialData() { super.setupInitialData() messageListView.deviceShareMessages = TPGuardMessageManager.shard.deviceShareMessages } override func makeConstraints() { super.makeConstraints() updateSubviewStatus() } override func bindActions() { super.bindActions() foldButton.onClickCallback = { [weak self] in print("fold Button") self?.messageListView.toggleCollapseState() } closeButton.onClickCallback = { if self.view.superview != nil { self.view.removeFromSuperview() } print("Close Button") } } override func setupText() { super.setupText() titleLabel.text = LocalizedString(key: omadaSharePush) } private func updateSubviewStatus() { if isExpanded { titleLabel.isHidden = false foldButton.isHidden = false closeButton.isHidden = false titleLabel.snp.remakeConstraints { make in make.top.equalToSuperview().offset(12) make.leading.equalToSuperview().offset(24) } foldButton.snp.remakeConstraints { make in make.top.equalToSuperview().offset(11) make.size.equalTo(24) } closeButton.snp.remakeConstraints { make in make.centerY.equalTo(foldButton) make.leading.equalTo(foldButton.snp.trailing).offset(16) make.size.equalTo(24) make.trailing.equalToSuperview().offset(-24) } scrollView.snp.remakeConstraints { make in make.top.equalToSuperview().offset(42) make.leading.equalToSuperview().offset(24) make.trailing.equalToSuperview().offset(-24) make.bottom.equalToSuperview().offset(-24) make.width.equalTo(420) } } else { titleLabel.isHidden = true foldButton.isHidden = true closeButton.isHidden = true scrollView.snp.remakeConstraints { make in make.top.equalToSuperview().offset(10) make.leading.equalToSuperview().offset(24) make.trailing.equalToSuperview().offset(-24) make.bottom.equalToSuperview().offset(-24) make.width.equalTo(420) make.height.equalTo(10) } } } } 这个controller现在有一个列表，可以折叠展开，扩展一下，实现两个同样的列表，都包含相同的折叠关闭按钮，使用同一个数据源即可
最新发布
10-10
override func viewWillDisappear() { super.viewWillDisappear() NotificationCenter.default.removeObserver(self, name: TPGuardNewDeviceShareMessageDidReceiveNotification, object: nil) } @objc func...
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#pragma mark 视图即将加入窗口时 -(void)viewWillAppear:(BOOL)animated{ NSLog(@"视图即将加入窗口时"); [self getdata];//加载 } #pragma mark 视图已经加入到窗口时 -(void)viewDidAppear:(BOOL)animated{ N...
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viewWillAppear:视图即将可见时调用。默认情况下不执行任何操作 viewDidAppear:视图已完全过渡到屏幕上时调用 viewWillDisappear:Calledafter the view was dismissed, covered or otherwise hidden. Defaultdoesnothing视图被驳回后调用，覆盖或以其他方式隐藏。默认情况下不执行任何...
viewDidUnload,viewDidLoad,viewWillAppear和viewWillDisappear
liliangchw的专栏
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这些方法本身没有逻辑，它们是回调函数，也就是说当系统处于某种状态会自动调用这些方法，里面的逻辑由自己填写。 viewDidLoad:在视图加载后被调用 viewWillAppear:视图即将可见时调用。默认情况下不执行任何操作 viewDidAppear: 视图已完全过渡到屏幕上时调用 viewWillDisappear:视图被驳回时调用，覆盖或以其他方式隐藏。默认情况下不执行任何操作 view
iOS视图控制对象生命周期的区别
UnknownDove的博客
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init－初始化程序 viewDidLoad－加载视图 viewWillAppear－UIViewController对象的视图即将加入窗口时调用； viewDidApper－UIViewController对象的视图已经加入到窗口时调用； viewWillDisappear－UIViewController对象的视图即将消失、被覆盖或是隐藏时调用； viewDidDisappear－U
viewDidLoad、viewDidUnload、viewWillAppear、viewDidAppear、viewWillDisappear 和 -viewDidDisappear的区别和使用
richard_如风的专栏
08-20 2341
首先看一下官方解释： - (void)loadView; // This is where subclasses should create their custom view hierarchy if they aren't using a nib. Should never be called directly. - (void)viewDidUnload NS_DEPRECATED_
xcode viewDidload viewDidUnload viewWillapper viewWilldisapper四个方法的执行
么西的IT世界你不懂
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这些方法本身没有逻辑，他们是回调函数，也就是说当系统处于某种状态会自动调用这些方法，里面的逻辑由你来填写。 viewDidLoad:在视图加载后被调用 viewWillAppear:视图即将可见时调用。默认情况下不执行任何操作 viewDidAppear: 视图已完全过渡到屏幕上时调用 viewWillDisappear:视图被驳回时调用，覆盖或以其他方式隐藏。默认情况下不执行任何操作 viewD
重写viewWillAppear 和 viewWillDisAppear时[super viewWillAppear] 和 [super viewWillDisappear]的调用位置...
weixin_33994429的博客
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参考网址：https://stackoverflow.com/questions/3906704/when-should-i-call-super 在写代码的过程中如果重写了viewWillAppear 和 viewWillDisAppear方法，但是没有调用[super viewWillAppear] 和 [super viewWillDisappear]的话使用静态分析工具(快捷键 comm...
后台运行不进viewWillDisappear
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Home键的时候并不是退出，仅仅是进入后台而已，applicationDidEnterBackground这个进入后台的代理方法会被触发，界面不会进入程序不进viewWillDisappear
iOS开发进阶（十）：viewController 生命周期讲解
IT全栈 华强工作室
03-28 1453
方法：销毁视图，释放资源。不要手动调用此方法，当引用计数值为0的时候，系统会自动调用此方法。可能会被调用多次（View可能会被多次加载），当view被添加到其他view中之前，会调用。当view从其他view中移除之前，调用。当view不再使用时，受到内存警告时，会将view释放并将其指向为。时，view已经生成了，时view还没有生成，分为A和B两个视图。
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