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Eilon / MauiHybridWebView

MIT License
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Control Throws a Null Exception When Hosted on a ContentView #41

Open RuddySantos opened 10 months ago

RuddySantos commented 10 months ago

I am very new to this. The requirement I have calls for the webview to be hosted in a control (contentView). The HybridView shows fine and callling JS methods etc works. However, when I close the popup window that is hosting the control there is an object reference not set to an instance of an object exception on the OnHandlerChanged --> NavigationCore.

NOTE: This app uses Mopups for pushing/popping pages.

peterblazejewicz commented 9 months ago

Does it happen with regular MAUI BlazorWebView?

rsantos16 commented 9 months ago

We did not try it with the regular BlazorWebView. We are in the process of looking at other solutions but this HybridWebView is the best choice due to our constrains.

Eilon commented 8 months ago

Hi @RuddySantos / @rsantos16 - I tried placing the HybridWebView inside a ContentView and that seemed to work just fine. Do you have a complete repro project that you can share for this?

Or perhaps a full stack trace of the exception?

I saw some places in the code that are possible culprits for a potential bug but it's hard to say without more info.

johandep commented 2 weeks ago

Hi @Eilon , we face the same issue and this is the stack trace:

at ObjCRuntime.Runtime.ThrowException(IntPtr gchandle) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/ObjCRuntime/Runtime.cs:line 2719
   at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) in /Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line 64
   at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) in `/Users/builder/azdo/_work/1/s/xamarin-macios/src/UIKit/UIApplication.cs:line` 96
   at MobileApp.Program.Main(String[] args) in /Users/johan/mobileapp/Platforms/iOS/Program.cs:line 13
2024-11-01 13:59:40.224525+0100 MobileApp[43460:4908687] Unhandled managed exception: Object reference not set to an instance of an object. (System.NullReferenceException)
   at HybridWebView.HybridWebView.get_PlatformWebView()
   at HybridWebView.HybridWebView.NavigateCore(String url)
   at HybridWebView.HybridWebView.Navigate(String url)
   at HybridWebView.HybridWebView.OnHandlerChanged()
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__128_0(Object state)
   at Foundation.NSAsyncSynchronizationContextDispatcher.Apply() in /Users/builder/azdo/_work/1/s/xamarin-macios/src/Foundation/NSAction.cs:line 179

We use the Shell to navigate between pages and when coming back to a page with the HybridWebView component on it, it always crashes in our project.