[iOS 26 beta] UIScene migration with loadFileURL:allowingReadAccessToURL: has partial rendering for app BG launch

Question

Created 3w

Replies 2

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We're currently migrating from AppDelegate to UISceneDelegate due to console warnings <UIScene lifecycle will soon be required. Failure to adopt will result in an assert in the future>.

Our application's UI, which is built on a single webpage, functions correctly when launched in the foreground after this migration.

However, we've encountered an issue with partial rendered UI components when launching the application from the background, such as upon receiving a VoIP call.

During a background launch, the following delegate calls occur before the client attempts to load a local webpage:

[08/07 16:25:49:037][ 0x101ea3910]<ALA_SIGNAL>: [OS-PLT] Exit -[AppDelegate application:didFinishLaunchingWithOptions:]
[08/07 16:25:49:084][ 0x10c0c4140]<PushToTalk> [Pushnotif] [] <ALA_SIGNAL>: [OS-CCF]  Enter -[PushNotificationManager pushRegistry:didReceiveIncomingPushWithPayload:forType:withCompletionHandler:] 
[08/07 16:25:49:098][ 0x101ea3910]Begin -[SceneDelegate scene:willConnectToSession:options:]
[08/07 16:25:49:098][ 0x101ea3910]Exit -[SceneDelegate scene:willConnectToSession:options:]

As part of client login process we load the index page in WebKit here:

[08/07 16:25:50:977][ 0x101ea3910]<ALA_SIGNAL>: [PLT-OS] Enter -[SceneDelegate loadUI:] [UI Launch Reason = 1]

Code:

    NSString *path = [[NSBundle mainBundle]pathForResource:@"index" ofType:@"html" inDirectory:@"www"];
    NSURL *urlReq = [NSURL fileURLWithPath:path];
    
    [webView loadFileURL:urlReq allowingReadAccessToURL:urlReq];

The problem we're observing is that the webpage is only partially rendering in this background launch scenario (Seen after brought to FG).

Any insights or assistance you can provide would be greatly appreciated.

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Answer 1

DTS Engineer OP

Apple

3w

The problem we're observing is that the webpage is only partially rendering in this background launch scenario (Seen after brought to FG).

Does the webview stay partially rendered or completes rendering when the App is the foreground and could you share the content of willConnectToSession ? Thanks

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Answer 2

neha24 OP

3w

Its partially rendered(components loaded) even after brought to foreground.

Using Main storyboard and configured with MainViewControlller which adds the webKit to the view with autolayout (No issues on layout)

Hence no code additions handling at willConnectToSession. (Does require any if so)

Part of BG launch, say 2 seconds later post to this willConnectToSession, client is loading local html page using

    [webView loadFileURL:urlReq allowingReadAccessToURL:urlReq];

0