5,380 questions
as Xamarin support ends May 1, 2024, you probably should start porting your app to Maui.
Not able to add new view controller to Xamarin ios storyboard kept getting error.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 81%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESC%3C/text%3E%3C/svg%3E)
Shraddha Chauhan
0
Reputation points
{MvvmCross.Exceptions.MvxException: Loading view of type ResultsViewController from storyboard Main failed:
Specified cast is not valid.
at MvvmCross.Platforms.Ios.Views.MvxIosViewsContainer.CreateViewOfType (System.Type viewType, MvvmCross.ViewModels.MvxViewModelRequest request) [0x0003e] in D:\a\1\s\MvvmCross\Platforms\Ios\Views\MvxIosViewsContainer.cs:53
at MvvmCross.Platforms.Ios.Views.MvxIosViewsContainer.CreateView (MvvmCross.ViewModels.MvxViewModelRequest request) [0x0003f] in D:\a\1\s\MvvmCross\Platforms\Ios\Views\MvxIosViewsContainer.cs:29
at MvvmCross.Platforms.Ios.Views.MvxCanCreateIosViewExtensions.CreateViewControllerFor (MvvmCross.Platforms.Ios.Views.IMvxCanCreateIosView view, MvvmCross.ViewModels.MvxViewModelRequest request) [0x00000] in D:\a\1\s\MvvmCross\Platforms\Ios\Views\MvxCanCreateIosViewExtensions.cs:46
at MvvmCross.Platforms.Ios.Presenters.MvxIosViewPresenter.<RegisterAttributeTypes>b__25_1 (System.Type viewType, MvvmCross.Platforms.Ios.Presenters.Attributes.MvxChildPresentationAttribute attribute, MvvmCross.ViewModels.MvxViewModelRequest request) [0x00000] in D:\a\1\s\MvvmCross\Platforms\Ios\Presenters\MvxIosViewPresenter.cs:101
at MvvmCross.Presenters.MvxPresentationAttributeExtensions+<>c__DisplayClass4_0`1[TMvxPresentationAttribute].<Register>b__0 (System.Type view, MvvmCross.Presenters.Attributes.IMvxPresentationAttribute attribute, MvvmCross.ViewModels.MvxViewModelRequest request) [0x00000] in D:\a\1\s\MvvmCross\Presenters\MvxPresentationAttributeExtensions.cs:56
at MvvmCross.Presenters.MvxAttributeViewPresenter.Show (MvvmCross.ViewModels.MvxViewModelRequest request) [0x00000] in D:\a\1\s\MvvmCross\Presenters\MvxAttributeViewPresenter.cs:175
at MvvmCross.Platforms.Ios.Views.MvxIosViewDispatcher+<>c__DisplayClass2_0.<ShowViewModel>b__0 () [0x0001d] in D:\a\1\s\MvvmCross\Platforms\Ios\Views\MvxIosViewDispatcher.cs:29
at MvvmCross.Base.MvxMainThreadAsyncDispatcher+<>c__DisplayClass1_0.<ExecuteOnMainThreadAsync>b__0 () [0x00011] in D:\a\1\s\MvvmCross\Base\MvxMainThreadAsyncDispatcher.cs:27
at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021
at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.4.0.18/src/Xamarin.iOS/Foundation/NSAction.cs:176
at (wrapper managed-to-native) UIKit.UIApplication.xamarin_UIApplicationMain(int,intptr,intptr,intptr,intptr&)
at UIKit.UIApplication.UIApplicationMain (System.Int32 argc, System.String[] argv, System.IntPtr principalClassName, System.IntPtr delegateClassName) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.4.0.18/src/Xamarin.iOS/UIKit/UIApplication.cs:58
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00013] in /Library/Frameworks/Xamarin.iOS.framework/Versions/16.4.0.18/src/Xamarin.iOS/UIKit/UIApplication.cs:84
at PatientApp.Application.Main (System.String[] args) [0x00001] in C:\vssdata\solutions\eMDAccess\eMDAccessPrimary\eMD-Mobile\iOSPatientApp\Main.cs:20 }
Developer technologies .NET Xamarin
{count} votes
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 40%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYL%3C/text%3E%3C/svg%3E)
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff2023-11-20T03:25:05.55+00:00 For further investigation, could you please provide the following information?
- What is your target platform and API level?
- Could you please provide detailed steps and minimized code snippets that can reproduce this issue and update them into the issue?
Please refer to Guidelines for posting a quality question on Microsoft Q&A for more details.
-
Shraddha Chauhan 0 Reputation points
2023-11-20T15:44:36.7266667+00:00 - What is your target platform and API level?
I am using REST API using .Net
- Could you please provide detailed steps and minimized code snippets that can reproduce this issue and update them into the issue?
I have added UIView controller in ios Project and model library project and then I suppose it should be added to storyboard on build project. but its not even I tried to add using xcode then its giving me cast error.
-
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 50,126 Reputation points Microsoft External Staff
2023-11-21T09:14:29.3333333+00:00 it should be added to storyboard on build project. but its not even I tried to add using xcode then its giving me cast error.
Did you follow the instructions in the Creating a Storyboard with Xcode for using storyboard?
-
Shraddha Chauhan 0 Reputation points
2023-11-21T14:40:39.69+00:00 I already have storyboard in my xamarin project do I need to add another one?
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(22.400000000000002, 3%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWZ%3C/text%3E%3C/svg%3E)
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff2023-11-22T07:30:24.99+00:00 I have added UIView controller in ios Project and model library project and then I suppose it should be added to storyboard on build project. but its not even I tried to add using xcode then its giving me cast error.
You only add a UIViewController class into you project, right? Or did you drag a new UIViewController into the Storyboard? What's the 'ResultsViewController', a new class derived from UIViewController, right? Could you describe more details about how you add the UIViewViewController into your project?
-
Shraddha Chauhan 0 Reputation points
2023-11-27T15:09:50.9066667+00:00 I Added the UIViewcontroller through the code in Visual Studio and Build the project.
-
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff
2023-11-28T09:06:51.66+00:00 You are using MvvmCross , right? The error is thrown by this third-party package, please make a sample and remove that package, and then test if the issue still exists.
-
Shraddha Chauhan 0 Reputation points
2023-11-28T13:55:12.3966667+00:00 My viewcontroller class in xamarin ios project only and viewmodel in my library project. not using third party package?
-
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff
2023-11-29T09:19:09.3+00:00 Do you mean you didn't use that package? But the error is thrown in MvvmCross.Platforms.Ios.Views.MvxIosViewsContainer, I still cannot reproduce your issue. Could you provide more steps so that I can reproduce the issue?
-
Shraddha Chauhan 0 Reputation points
2023-11-29T14:37:59.8266667+00:00 So I have one IosApp xamrin project and a library. IOSApp had viewController folders and classes mostly hand written, and library has shared classes with android and it has viewmodels as well.
So what I did I created a UIController class in IosAPP that need to be added in Story board while its not.
Sign in to comment
2 answers
Sort by: Most helpful
-
Deleted
This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
Comments have been turned off. Learn more
-
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
Bruce (SqlWork.com) 77,686 Reputation points Volunteer Moderator2023-11-29T16:34:02.2933333+00:00