AppDelegate.PerformFetch(UIApplication, UIBackgroundFetchResult)': no suitable method found to override

Jassim Al Rahma 1,556 Reputation points
2023-05-06T14:38:23.2066667+00:00

Hi,

I am trying to use background service in .NET MAUI app and here is my AppDelegate:

using Foundation;
using UIKit;
using UserNotifications;

namespace MyApp;

[Register("AppDelegate")]
public class AppDelegate : MauiUIApplicationDelegate
{
    protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();

    protected override async void PerformFetch(UIApplication application, UIBackgroundFetchResult completionHandler)
    {
        // Perform your background fetch here

        completionHandler(UIBackgroundFetchResult.NewData);
    }
}

but I get this error:

/Users/jassim/Projects/MyApp/MyApp/Platforms/iOS/AppDelegate.cs(35,35): Error CS0115: 'AppDelegate.PerformFetch(UIApplication, UIBackgroundFetchResult)': no suitable method found to override (CS0115) (MyApp)

Kindly help..

Thanks

.NET MAUI
.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
3,225 questions
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  1. Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 29,381 Reputation points Microsoft Vendor
    2023-05-08T05:57:21.3566667+00:00

    Hello,

    This is a known issue reported at GitHub. Please see iOS AppDelegate - PerformFetch override #1419 and iOS AppDelegate - Override for PerformFetch is not available #7957

    And it was fixed the in .Net8.0.0-preview.3.8149.

    For the usage of App lifecycle, you could refer to App lifecycle - .NET MAUI | Microsoft Learn.

    Best Regards,

    Wenyan Zhang


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