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iOS crashes with NullReferenceExpcetion in iOS if Camera access is disabled from Settings
See original GitHub issueRepro:
- Create two pages in a Xamarin Forms page, an Entry page and a Scanner page
- Add Zxing to Scanner page but leave IsVisible = false
- On iOS mobile device, in Settings disable Camera access to the app
- Open the App navigate from Entry page to Scanner Page and Navigate Back
Expected: App should navigate back to the entry page
Actual:
Throws ‘Object reference not set to an instance of an object’ - NullReferenceException
Stack Trace:
ZXingScannerViewRenderer.OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs`1[TElement] e)AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state)
NSAsyncSynchronizationContextDispatcher.Apply ()(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)
Application.Main (System.String[] args)
Applies to ZXing.Net.Mobile version 3.0.0-beta5
Issue Analytics
- State:
- Created 3 years ago
- Reactions:1
- Comments:6
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I see it also on 3.0.0-beta5. Is Xamarin.Forms requirement 5.0.0.1874 or above inevitable for the upcoming releases https://github.com/Redth/ZXing.Net.Mobile/commit/c73484446f71859e0183160b14061a40382d87bf ?
Latest “stable” version ZXing.Net.MobileX.Forms 3.0.1. Xamarin.Forms 5.0.0.2012 also have this issue.