How to show custom splash screen on iOS 13 when app enters background?

Question

The question is similar to this one:

Display a view or splash screen before applicationDidEnterBackground (to avoid active view screenshot)

The link above also shows code examples how to implement it.

I need to show for example white screen when the app enters background on "multitasking screen":

The problem is that way doesn't work on iOS 13! How to fix this issue?

score 1 · Answer 1 · answered Oct 09 '19 at 09:08

1

You show that in this UIWindowSceneDelegate method. Implement whatever logic you want in it.

func sceneDidEnterBackground(_ scene: UIScene)

answered Oct 09 '19 at 09:08

Suh Fangmbeng

573
4
16

Maybe. But the project is developed starting with the older Xcode version which didn't know about `UIWindowSceneDelegate` and `SwiftUI`. Should the project be `SwiftUI`-based to use it? – Vyachaslav Gerchicov Oct 09 '19 at 09:26
it does not have to SwiftUI based – Suh Fangmbeng Oct 09 '19 at 09:28
ok, how to add `UIWindowSceneDelegate ` to the existing project? – Vyachaslav Gerchicov Oct 09 '19 at 09:29
you don't have to use UIWindowSceneDelegate for iOS 13 anyways. does your app delegate conform to the `UIApplicationDelegate` – Suh Fangmbeng Oct 09 '19 at 09:35
I subscribed to `UIApplicationDidEnterBackground` in my custom class. The code is executed as in the previous iOS versions but nothing happens in UI. – Vyachaslav Gerchicov Oct 09 '19 at 09:37
is the UI just dark or you're sure nothing happens – Suh Fangmbeng Oct 09 '19 at 09:38
try adding `UIUserInterfaceStyle Light` to your plist lets see what happens – Suh Fangmbeng Oct 09 '19 at 09:39
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/200593/discussion-between-vyachaslav-gerchicov-and-nscoder). – Vyachaslav Gerchicov Oct 09 '19 at 09:40

score 1 · Answer 2 · answered Jan 28 '20 at 13:59

I use this (my own) implementation for functionality you ask for both iOS 12 & iOS 13 support

AppDelegate:

private var blankWindow: BlankWindow?

// MARK: Shared AppDelegate

extension AppDelegate {
    static func blankWindowShouldAppear(blankWindow: inout BlankWindow?) {
        blankWindow = BlankWindow(frame: UIScreen.main.bounds)
        blankWindow?.makeKeyAndVisible()
    }

    static func blankWindowShouldDisappear(window: UIWindow?, blankWindow: inout BlankWindow?) {
        window?.makeKeyAndVisible()
        blankWindow = nil
    }

    @available(iOS 13.0, *)
    static func blankWindowShouldAppear(_ windowScene: UIWindowScene, blankWindow: inout BlankWindow?) {
        blankWindow = BlankWindow(windowScene: windowScene)
        blankWindow?.makeKeyAndVisible()
    }
}

// MARK: Old life cycle methods

extension AppDelegate {
    /// ⚠️ Methods here will not be called under iOS 13 due to new SceneDelegate life cycle

    func applicationWillEnterBackground(_ application: UIApplication) {
        AppDelegate.blankWindowShouldAppear(blankWindow: &blankWindow)
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        AppDelegate.blankWindowShouldDisappear(window: window, blankWindow: &blankWindow)
    }
}

SceneDelegate:

private var blankWindow: BlankWindow?

// MARK: New life cycle methods

@available(iOS 13.0, *)
extension SceneDelegate {
    /// ⚠️ As for now, we use fallback to AppDelegate shared methods to reduce code duplication
    /// Not all of the new life cycle methods are implemented here, yet

    func sceneWillEnterForeground(_ scene: UIScene) {
        AppDelegate.blankWindowShouldDisappear(window: window, blankWindow: &blankWindow)
    }

    func sceneWillEnterBackground(_ scene: UIScene) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        AppDelegate.blankWindowShouldAppear(windowScene, blankWindow: &blankWindow)
    }
}

Where BlankWindow class is a UIWindow you wanna show to a user at this moment

would be nice if you could give the BlankWIndow implementation — Async-, Mar 05 '21 at 13:39
@Async- the BlankWindow may be any subclass of UIWindow, you may customize it however you want. There is now special or universal implementation for that :) — kikiwora, Mar 06 '21 at 14:14

How to show custom splash screen on iOS 13 when app enters background?

2 Answers2