OnSleep / OnResumed called by System Dialogs on iOS [Bug] #13077
Comments
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This is a tricky one @Axemasta hartez explains the behavior in a comment here #8413 (comment) Those application events are just tied to the native equivalents but what's definitely missing here is some better granularity. This is something that we're looking into for MAUI But for this case it's not really a bug. |
PureWeen
added
the
s/needs-info ❓
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Hi @PureWeen yes I saw hartez's comment and am aware its difficult. I really wanted to open up the conversation about lifecycle. Hartez mentioned that the team would help suggest a workaround if these events were causing issues. In my example my app immediately spins up a SignalR connection which I am managing in the App lifecycle methods: protected override void OnStart()
{
base.OnStart();
Connect();
}
protected override void OnResume()
{
base.OnResume();
Connect();
}
protected override void OnSleep()
{
base.OnSleep();
Disconnect();
}
private async void Connect()
{
try
{
await _sessionManager.StartSession();
}
catch (Exception ex)
{
_loggingManager.LogError("An exception occured connecting to starting app session", "Connect", ex);
}
}
private void Disconnect()
{
_sessionManager.EndSession();
}Starting the Signalling service immediately is a requirement as it connects to our systems and allows remote users to view the device screen. The first thing my users do is authenticate with M365 / Gsuite and both logins use webview popups to handle the login. When the login starts the For the time being i've commented out the |
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We are reviewing the cross platform lifecycle API's in Maui: dotnet/maui#30 This should help with implementing patterns like you are attempting. Your best bet for now is to continue on with your custom events in the AppDelegate. |
Description
When certain iOS system dialogs appear the
OnSleepmethod in theAppis called. Events I have noticed include:This is making it difficult to implement a reliable background service using Xamarin Forms events whilst the app is running in the foreground.
This is the same issue as #8413 which had no reproduction so I have provided one here, although as I mention the scope of this issue is wider than just permission requests. If your app is redirected to a microsoft login for example, the
OnSleepmethod will be called.I came across this issue when handling the sleep / wake events for the SignalR service in my companys app. The app will connect to our SignalR client when it loads. I decided to disconnect it when the
OnSleepmethod is called because the app is now "offline", I noticed that when logging for the first time the SignalR service was being disconnected leading me to this issue. I would not consider the app to get asleep at this time, the user is currently going through login!Steps to Reproduce
OnSleep/OnResumemethods inApp.xaml.csExpected Behavior
OnSleepis not called because the app is in the foregroundActual Behavior
OnSleepis called, andOnResumeis called when the system dialog has completed.Basic Information
Environment
Reproduction Link
I have created a reproduction repo that requests photos permission. You will need to delete the app and reinstall to get the permission dialog to show, this was easier than putting something in like Microsoft MSAL which will trigger this issue every-time.
OnSleepRepro.zip
Workaround
The workaround is ignoring the xamarin forms events and implementing your own service that is aware of the native events.
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