This project shows that shell navigation is broken on iOS when using DI, but works for Android.
The reason this is a problem is that some pages in a real world application will require DI in their constructors to carry out thewir purpose.
It seems there is an issue with adding/removing the pages from the navigation stack when building/deploying to iOS only.
GIVEN I am building for iOS simulator or physical device, and within MauiProgram.cs ensure that the DI for the pages, ln 24-26, IS NOT commented out.
WHEN The app loads
THEN I click the buttons to go to Page 2, Page 3 and then Main Page the navigation works, I then go to Page 2, Then Page 3 and back to Page 2, Page 2 will not load, I then go to Main Page, Page 2 and Page 3 buttons work again. The exception us swallowed because of async/await.
GIVEN I am building for iOS simulator or physical device, and within MauiProgram.cs ensure that the DI for the pages, ln 24-26, IS NOT commented out. and I change _Clicked methods to async/await.
WHEN The app loads
THEN I click the buttons to go to Page 2, Page 3 and then Main Page the navigation works, I then go to Page 2, Then Page 3 and back to Page 2, the below exception will be thrown within UIApplication.Main(args, null, typeof(AppDelegate));
Objective-C exception thrown.
Name: NSInvalidArgumentException Reason: <Microsoft_Maui_Controls_Platform_Compatibility_ShellSectionRenderer: 0x7fdb03348000>
is pushing the same view controller instance (<Microsoft_Maui_Platform_PageViewController: 0x7fdb02fef5c0>)
more than once which is not supported and is most likely an error in the application : com.companyname.navigationcrashtest
GIVEN I am building for iOS or Android simulator or physical device, and within MauiProgram.cs ensure that the DI for the pages, ln 24-26, IS commented out
WHEN The app loads
THEN I click the buttons to go to Page 2, Page 3 and then Main Page the navigation works, and pressing any futher buttons the will navigate to the requiered pages.
Microsoft access for the full exception with trace, enjoy!
Objective-C exception thrown. Name: NSInvalidArgumentException Reason: <Microsoft_Maui_Controls_Platform_Compatibility_ShellSectionRenderer: 0x7fa17f5bfe00> is pushing the same view controller instance (<Microsoft_Maui_Platform_PageViewController: 0x7fa17c3d40e0>) more than once which is not supported and is most likely an error in the application : com.companyname.navigationcrashtest
Native stack trace:
0 CoreFoundation 0x000000010c5748cb __exceptionPreprocess + 242
1 libobjc.A.dylib 0x000000011c9f5ba3 objc_exception_throw + 48
2 UIKitCore 0x0000000128229273 -[UINavigationController pushViewController:transition:forceImmediate:] + 3898
3 UIKitCore 0x00000001282281a8 -[UINavigationController pushViewController:animated:] + 669
4 libxamarin-dotnet-debug.dylib 0x000000010994149c xamarin_dyn_objc_msgSendSuper + 220
5 ??? 0x0000000151f76ca7 0x0 + 5670136999
6 libmonosgen-2.0.dylib 0x000000010a10844a ves_pinvoke_method + 474
7 libmonosgen-2.0.dylib 0x000000010a0fb2a9 interp_exec_method + 3737
8 libmonosgen-2.0.dylib 0x000000010a0f8a53 interp_runtime_invoke + 259
9 libmonosgen-2.0.dylib 0x0000000109f1f4cd mono_runtime_try_invoke + 157
10 libmonosgen-2.0.dylib 0x0000000109f2165f mono_runtime_invoke + 95
11 NavigationCrashTest 0x0000000100911b48 _ZL30native_to_managed_trampoline_9P11objc_objectP13objc_selectorPP11_MonoMethodj + 280
12 NavigationCrashTest 0x0000000100957f09 -[UIKit_UIControlEventProxy BridgeSelector] + 41
13 UIKitCore 0x0000000128bf5d05 -[UIApplication sendAction:to:from:forEvent:] + 95
14 UIKitCore 0x0000000128357c74 -[UIControl sendAction:to:forEvent:] + 110
15 UIKitCore 0x0000000128358078 -[UIControl _sendActionsForEvents:withEvent:] + 345
16 UIKitCore 0x0000000128354203 -[UIButton _sendActionsForEvents:withEvent:] + 148
17 UIKitCore 0x00000001283568cf -[UIControl touchesEnded:withEvent:] + 485
18 UIKitCore 0x0000000128c3ae95 -[UIWindow _sendTouchesForEvent:] + 1292
19 UIKitCore 0x0000000128c3cef1 -[UIWindow sendEvent:] + 5304
20 UIKitCore 0x0000000128c107f2 -[UIApplication sendEvent:] + 898
21 UIKit 0x0000000166b3aa90 -[UIApplicationAccessibility sendEvent:] + 85
22 UIKitCore 0x0000000128cb7e61 __dispatchPreprocessedEventFromEventQueue + 9381
23 UIKitCore 0x0000000128cba569 __processEventQueue + 8334
24 UIKitCore 0x0000000128cb08a1 __eventFetcherSourceCallback + 272
25 CoreFoundation 0x000000010c4d4035 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
26 CoreFoundation 0x000000010c4d3f74 __CFRunLoopDoSource0 + 157
27 CoreFoundation 0x000000010c4d3771 __CFRunLoopDoSources0 + 212
28 CoreFoundation 0x000000010c4cde73 __CFRunLoopRun + 927
29 CoreFoundation 0x000000010c4cd6f7 CFRunLoopRunSpecific + 560
30 GraphicsServices 0x0000000120f3a28a GSEventRunModal + 139
31 UIKitCore 0x0000000128bef62b -[UIApplication _run] + 994
32 UIKitCore 0x0000000128bf4547 UIApplicationMain + 123
33 libxamarin-dotnet-debug.dylib 0x00000001098fba5a xamarin_UIApplicationMain + 58
34 libmonosgen-2.0.dylib 0x000000010a109619 do_icall + 345
35 libmonosgen-2.0.dylib 0x000000010a108123 do_icall_wrapper + 291
36 libmonosgen-2.0.dylib 0x000000010a0fb180 interp_exec_method + 3440
37 libmonosgen-2.0.dylib 0x000000010a0f8a53 interp_runtime_invoke + 259
38 libmonosgen-2.0.dylib 0x0000000109f1da18 mono_runtime_invoke_checked + 136
39 libmonosgen-2.0.dylib 0x0000000109f25a2c do_exec_main_checked + 92
40 libmonosgen-2.0.dylib 0x000000010a054a82 mono_jit_exec + 354
41 libxamarin-dotnet-debug.dylib 0x000000010993fe77 xamarin_main + 1927
42 NavigationCrashTest 0x00000001009a50b4 main + 68
43 dyld 0x00000001095192bf start_sim + 10
44 ??? 0x0000000200ee3310 0x0 + 8605545232