{"id":3178,"date":"2022-08-11T10:33:34","date_gmt":"2022-08-11T08:33:34","guid":{"rendered":"https:\/\/www.albertopasca.it\/whiletrue\/?p=3178"},"modified":"2022-08-11T10:34:39","modified_gmt":"2022-08-11T08:34:39","slug":"swift-simple-full-screen-spinner","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/swift-simple-full-screen-spinner\/","title":{"rendered":"Swift – Simple full screen loader"},"content":{"rendered":"\n

<\/p>\n\n\n\n

Hello,<\/p>\n\n\n\n

resuming an old post, that help you to create an UIAlert extension<\/strong> to show a modal popup, https:\/\/www.albertopasca.it\/whiletrue\/objective-c-modal-view-in-navigation-and-tabbar-controller-projects\/<\/a> , I’ve created a new modern implementation that use UIWindow<\/strong>.<\/p>\n\n\n\n

The scope is to show a spinner (or a Lottie<\/em> spinner, or whatever you prefer), centered in the screen with automatic or manually dismission. Background can be blurred or colored, like this screen:<\/p>\n\n\n\n\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

<\/p>\n\n\n\n

Show me the code 🚧:<\/h2>\n\n\n\n

Create a new SpinnerManager<\/strong> class and make it singleton (singleton because logically, no you can show only one spinner each time…).<\/p>\n\n\n\n

class SpinnerManager {\n    static let shared: SpinnerManager = { SpinnerManager() }()\n    \n    func showAlert() {\n\n    }\n        \n    func dismiss() {\n\n    }\n    \n}<\/code><\/pre>\n\n\n\n
Now you can show or hide the spinner, calling SpinnerManager.shared.showAlert()<\/strong> and dismiss using SpinnerManager.shared.dismiss()<\/strong>.<\/p>\n\n\n\n
<\/p>\n\n\n\n
\n\n\n\n
C<\/strong>reate the real Spinner 🚀:<\/h3>\n\n\n\n
Add a new UIViewController<\/strong>, in the way you prefer, using Storyboards or programmatically.<\/p>\n\n\n\n
In this example we create a simple UIViewController programmatically.<\/p>\n\n\n\n
The next class adds using constraints, two views, a rounded white view<\/strong> and an UIActivityIndicator<\/strong> on top. Nothing else.<\/p>\n\n\n\n
class SpinnerViewController: UIViewController {\n\n    override func loadView() {\n        super.loadView()\n        \n        let spinner = UIView(frame: .zero)\n        spinner.backgroundColor = .white\n        spinner.layer.cornerRadius = 18\n        spinner.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner, .layerMinXMaxYCorner, .layerMaxXMaxYCorner]\n        spinner.layer.shadowOffset = CGSize(width: 0, height: 0)\n        spinner.layer.shadowRadius = 6\n        spinner.layer.shadowOpacity = 0.1\n\n        let activity = UIActivityIndicatorView(frame: spinner.bounds)\n        activity.color = .red\n        activity.style = .large\n        activity.startAnimating()\n        spinner.addSubview(activity)\n\n        self.view.addSubview( spinner )\n        \n        spinner.translatesAutoresizingMaskIntoConstraints = false\n        let horizontalContainerConstraint = NSLayoutConstraint(item: spinner, attribute: .centerX, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: .centerX, multiplier: 1, constant: 0)\n        let verticalContainerConstraint = NSLayoutConstraint(item: spinner, attribute: .centerY, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: .centerY, multiplier: 1, constant: 0)\n        let widthContainerConstraint = NSLayoutConstraint(item: spinner, attribute: .width, relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 100)\n        let heightContainerConstraint = NSLayoutConstraint(item: spinner, attribute: .height, relatedBy: NSLayoutConstraint.Relation.equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 100)\n        NSLayoutConstraint.activate([\n            horizontalContainerConstraint,\n            verticalContainerConstraint,\n            widthContainerConstraint,\n            heightContainerConstraint\n        ])\n\n        activity.translatesAutoresizingMaskIntoConstraints = false\n        let horizontalActivityConstraint = NSLayoutConstraint(item: activity, attribute: .centerX, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: .centerX, multiplier: 1, constant: 0)\n        let verticalActivityConstraint = NSLayoutConstraint(item: activity, attribute: .centerY, relatedBy: NSLayoutConstraint.Relation.equal, toItem: view, attribute: .centerY, multiplier: 1, constant: 0)\n        NSLayoutConstraint.activate([\n            horizontalActivityConstraint,\n            verticalActivityConstraint\n        ])\n    }\n\n}<\/code><\/pre>\n\n\n\n
\n\n\n\n
Now we have the basic SpinnerManager and a new view-controller.<\/p>\n\n\n
\n
\"\"<\/figure>\n<\/div>\n\n\n
<\/p>\n\n\n\n
Let’s add some logic in our manager.<\/p>\n\n\n\n
class SpinnerManager {\n    [...]\n\n    private lazy var spinnerVC: SpinnerViewController = SpinnerViewController()\n    private var blankWindow: UIWindow?\n\n    func showAlert() {      \n        if let currentWindowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene {\n            blankWindow = UIWindow(windowScene: currentWindowScene)\n            blankWindow?.backgroundColor = UIColor.black.withAlphaComponent(0.25)\n            blankWindow?.windowLevel = .alert\n            blankWindow?.rootViewController = spinnerVC\n            blankWindow?.makeKeyAndVisible()\n        }\n    }\n    \n    func dismiss() {\n        blankWindow = nil\n    }\n    \n}<\/code><\/pre>\n\n\n\n
the blankWindow is on “windowLevel<\/strong>” = .alert<\/strong>, this mean that the spinner is shown at the same layer of the system modal alert, or better, on top of all other windows.<\/p>\n\n\n\n
<\/p>\n\n\n\n
Basically this code works<\/em>, you have a new SpinnerViewController<\/strong>, shown or hidden by the two relative functions.<\/p>\n\n\n\n
But we want to add more features, like automatic dismission (timeout).<\/p>\n\n\n\n
<\/p>\n\n\n\n
\n\n\n\n
A<\/strong>dding timeout dismission ⏰<\/h3>\n\n\n\n
We need now to create a Timer<\/strong> and a callback closure:<\/p>\n\n\n\n
class SpinnerManager {\n    [...]\n    private var timeoutCallback: (() -> Void)?\n    private var timeoutHandlerTimer: Timer?\n    [...]<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
and pass it to the showAlert<\/strong> function, using if you prefer a default value (in my case 30 seconds):<\/p>\n\n\n\n
func showAlert(\n    autodismissTimeout: Double = 30.0,\n    timeoutCallback: (() -> Void)? = nil\n) {\n    [...]\n}<\/code><\/pre>\n\n\n\n
Before using the Timer, we need to know if the Spinner is visible on screen or not. To reach this, you can add a isVisible()<\/code> method:<\/p>\n\n\n\n
[...]\nvar isVisible: Bool {\n    get {\n       (UIApplication.topMostKeyWindow?.rootViewController as? SpinnerViewController) != nil\n    }\n}\n[...]<\/code><\/pre>\n\n\n\n
\n\n\n\n
But you need a simple extension to get the topMostKeyWindow<\/strong>, as also explained here<\/a>: <\/p>\n\n\n\n
extension UIApplication {\n    \/\/\/ The top most keyWindow\n    static var topMostKeyWindow: UIWindow? {\n        UIApplication.shared.connectedScenes\n            .first(where: { $0.activationState == .foregroundActive })\n            .map({ $0 as? UIWindowScene })\n            .flatMap({ $0 })?.windows\n            .first(where: { $0.isKeyWindow })\n    }\n}<\/code><\/pre>\n\n\n\n
\n\n\n\n
Well, all is ready, let’s add the timer:<\/p>\n\n\n\n
[...]\n    func showAlert(\n        autodismissTimeout: Double = 30.0, \/\/ both optionals\n        timeoutCallback: (() -> Void)? = nil \/\/ both optionals\n    ) {\n\n        if isVisible {\n            if autodismissTimeout > 0 { \/\/ handle timeout\n                timeoutHandlerTimer?.invalidate()\n                timeoutHandlerTimer = Timer.scheduledTimer(\n                    timeInterval: autodismissTimeout, target: self, selector: #selector(dispatchTimeoutHandlerAndDismiss), userInfo: nil, repeats: false\n                )\n            }\n            return\n        }\n        \n        if autodismissTimeout > 0 {\n            self.timeoutCallback = timeoutCallback\n        }\n       \n        if let currentWindowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene {\n            blankWindow = UIWindow(windowScene: currentWindowScene)\n            blankWindow?.backgroundColor = UIColor.black.withAlphaComponent(0.25)\n            blankWindow?.windowLevel = .alert\n            blankWindow?.rootViewController = spinnerVC\n            blankWindow?.makeKeyAndVisible()\n            \n            if autodismissTimeout > 0 {\n                timeoutHandlerTimer?.invalidate()\n                timeoutHandlerTimer = Timer.scheduledTimer(\n                    timeInterval: autodismissTimeout, target: self, selector: #selector(dispatchTimeoutHandlerAndDismiss), userInfo: nil, repeats: false\n                )\n            }\n        }\n    }\n    \n    @objc private func dispatchTimeoutHandlerAndDismiss() {\n        timeoutCallback?()\n        self.dismiss()\n    }\n    \n    func dismiss() {\n        timeoutHandlerTimer?.invalidate()\n        timeoutHandlerTimer = nil\n        timeoutCallback = nil\n        blankWindow = nil\n    }\n\n\n[...]<\/code><\/pre>\n\n\n\n
\n\n\n\n
T<\/strong>esting code 💥<\/h3>\n\n\n\n
Let’s see if it works, so go back in your main View-Controller and make an example test<\/strong>:<\/p>\n\n\n\n
class ViewController: UIViewController {\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        \n        \/\/ add this if you want to test the manual dismission\n        Timer.scheduledTimer(\n            timeInterval: 5,\n            target: self,\n            selector: #selector(closeSpinner),\n            userInfo: nil,\n            repeats: false\n        )\n    }\n\n    \/\/ example on how to show a spinner\n    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {\n        SpinnerManager.shared.showAlert(autodismissTimeout: 15) {\n            print( \"closed after timeout\" )\n        }\n    }\n\n    \/\/ the timer callback\n    @objc func closeSpinner() {\n        SpinnerManager.shared.dismiss()\n    }\n\n}<\/code><\/pre>\n\n\n\n
Perfect! Work is now complete.<\/p>\n\n\n\n
Nope, I want also a blurred background, that is more cool!<\/p>\n\n\n\n
<\/p>\n\n\n\n
\n\n\n\n
A<\/strong>dding blurred background 🌫<\/h3>\n\n\n\n
The last part of this tutorial is about configuring and adding an optional blurred view as background of our spinner:<\/p>\n\n\n\n
As a commodity, you can reuse this snippet (not mine, founded online), that help you to create a custom UIVisualEffectView<\/strong> in a few row of code:<\/p>\n\n\n\n
class CustomVisualEffectView: UIVisualEffectView {\n    private let theEffect: UIVisualEffect\n    var customIntensity: CGFloat\n    private var animator: UIViewPropertyAnimator?\n\n    init(effect: UIVisualEffect, intensity: CGFloat) {\n        theEffect = effect\n        customIntensity = intensity\n        super.init(effect: nil)\n    }\n    \n    required init?(coder aDecoder: NSCoder) { nil }    \n    deinit { animator?.stopAnimation(true) }\n    \n    override func draw(_ rect: CGRect) {\n        super.draw(rect)\n        effect = nil\n        animator?.stopAnimation(true)\n        animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [unowned self] in\n            effect = theEffect\n        }\n        animator?.fractionComplete = customIntensity\n    }\n}<\/code><\/pre>\n\n\n\n
After that, edit a little bit the previous SpinnerManager<\/em> code, adding the blurred view.<\/p>\n\n\n\n
In particular, declare the CustomVisualEffectView<\/strong><\/p>\n\n\n\n
private var blurEffectView: CustomVisualEffectView?<\/code><\/pre>\n\n\n\n
and add as background:<\/p>\n\n\n\n
    [...]\n    func showAlert(\n        blurBackground: Bool = false,\n        autodismissTimeout: Double = 30.0,\n        timeoutCallback: (() -> Void)? = nil\n    ) {\n        blurEffectView?.removeFromSuperview()\n        [...]\n        blankWindow?.rootViewController = spinnerVC\n\n        \/\/ check if we need to add a blurred view\n        if blurBackground {\n            \/\/ play with effects\n            blurEffectView = CustomVisualEffectView(effect: UIBlurEffect(style: .dark), intensity: 0.0)\n            blurEffectView?.frame = blankWindow!.rootViewController!.view.bounds\n            blurEffectView?.autoresizingMask = [.flexibleWidth, .flexibleHeight]\n            \n            UIView.animate(withDuration: 0.25) {\n                self.blurEffectView!.customIntensity = 0.15 \/\/ play with intensity\n            }\n            \n            blankWindow?.rootViewController?.view.insertSubview(blurEffectView!, at: 0)\n        }\n\n        blankWindow?.makeKeyAndVisible()\n        [...]<\/code><\/pre>\n\n\n\n
We’re really complete now.<\/p>\n\n\n\n
\n\n\n\n
🎉 You can call the new code using these two functions:<\/h4>\n\n\n\n
SpinnerManager.shared.showAlert(blurBackground: true, autodismissTimeout: 15) {\n    print( \"closed after timeout\" )\n}<\/code><\/pre>\n\n\n\n
SpinnerManager.shared.dismiss()<\/code><\/pre>\n\n\n\n
With or without blurred background:<\/p>\n\n\n\n
\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n<\/figure>\n\n\n\n
Have fun.<\/p>\n\n\n\n
As usually, for lazy people, the code is on GitHub<\/a>.<\/em><\/sub><\/p>\n","protected":false},"excerpt":{"rendered":"
Hello, resuming an old post, that help you to create an UIAlert extension to show a modal popup, https:\/\/www.albertopasca.it\/whiletrue\/objective-c-modal-view-in-navigation-and-tabbar-controller-projects\/ , I’ve created a new modern implementation that use UIWindow. The scope is to show a spinner (or a Lottie spinner, or whatever you prefer), centered in the screen with automatic or manually dismission. Background can Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[67,763,11,2,3,30],"tags":[163,961,1061,46,1062],"class_list":["post-3178","post","type-post","status-publish","format-standard","hentry","category-funny","category-ios","category-mobile","category-objectivec","category-swift","category-xcode","tag-background","tag-blur","tag-modal","tag-swift","tag-timeout"],"yoast_head":"\nSwift - Simple full screen loader - while (true) {\u00a0}<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.albertopasca.it\/whiletrue\/swift-simple-full-screen-spinner\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Swift - Simple full screen loader - while (true) {\u00a0}\" \/>\n<meta property=\"og:description\" content=\"Hello, resuming an old post, that help you to create an UIAlert extension to show a modal popup, https:\/\/www.albertopasca.it\/whiletrue\/objective-c-modal-view-in-navigation-and-tabbar-controller-projects\/ , I’ve created a new modern implementation that use UIWindow. 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