我有一个 Xamarin iOS 应用程序,它工作正常,但我不知道我触及了什么,所以当我单击按钮移动到 Storyboard 中的另一个 View 时它开始引发此异常:
System.Exception: Failed to marshal the Objective-C object 0x7ffa72c19570 (type: PropertyListViewController). Could not find an existing managed instance for this object, nor was it possible to create a new managed instance (because the type 'Rental.iOS.PropertyListViewController' does not have a constructor that takes one IntPtr argument).
at at (wrapper managed-to-native) ObjCRuntime.Messaging:void_objc_msgSendSuper_bool_bool (intptr,intptr,bool,bool)
at UIKit.UIViewController.BeginAppearanceTransition (System.Boolean isAppearing, System.Boolean animated) [0x0002c] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/build/ios/native/UIKit/UIViewController.g.cs:168
at XLPagerTabStrip.PagerTabStripViewController.UpdateContent () [0x001c3] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:271
at XLPagerTabStrip.PagerTabStripViewController.Scrolled (UIKit.UIScrollView scrollView) [0x0000e] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:339
at at (wrapper managed-to-native) ObjCRuntime.Messaging:void_objc_msgSend_CGPoint (intptr,intptr,CoreGraphics.CGPoint)
at UIKit.UIScrollView.set_ContentOffset (CoreGraphics.CGPoint value) [0x00010] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/build/ios/native/UIKit/UIScrollView.g.cs:387
at XLPagerTabStrip.PagerTabStripViewController.UpdateContent () [0x00068] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:247
at XLPagerTabStrip.PagerTabStripViewController.Scrolled (UIKit.UIScrollView scrollView) [0x0000e] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:339
at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:63
at Rental.iOS.Application.Main (System.String[] args) [0x00008] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/Main.cs:17
我可以在 Interface Designer 中检查什么以确保我没有做错任何事情?
我添加了这个构造函数:
public partial class PropertyListViewController : UIViewController
{
protected PropertyListViewController(IntPtr handle) : base(handle)
{
// Note: this .ctor should not contain any initialization logic.
}
~~~~
}
但是现在我收到这个错误:
Foundation.MonoTouchException: Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: -[UIViewController _loadViewFromNibNamed:bundle:] loaded the "PropertyListViewController" nib but the view outlet was not set.
Native stack trace:
0 CoreFoundation 0x000000010c73ad4b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000011713a21e objc_exception_throw + 48
2 CoreFoundation 0x000000010c7a42b5 +[NSException raise:format:] + 197
3 UIKit 0x00000001101b6aea -[UIViewController _loadViewFromNibNamed:bundle:] + 679
4 UIKit 0x00000001101b72e7 -[UIViewController loadView] + 177
5 UIKit 0x00000001101b761c -[UIViewController loadViewIfRequired] + 201
6 UIKit 0x00000001101be062 -[UIViewController __viewWillAppear:] + 118
7 Rental.iOS 0x000000010c0c6f9c xamarin_dyn_objc_msgSendSuper + 220
8 ??? 0x0000000130fb7405 0x0 + 5116752901
at at (wrapper managed-to-native) ObjCRuntime.Messaging:void_objc_msgSendSuper_bool_bool (intptr,intptr,bool,bool)
at UIKit.UIViewController.BeginAppearanceTransition (System.Boolean isAppearing, System.Boolean animated) [0x0002c] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/build/ios/native/UIKit/UIViewController.g.cs:168
at XLPagerTabStrip.PagerTabStripViewController.UpdateContent () [0x001c3] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:271
at XLPagerTabStrip.PagerTabStripViewController.Scrolled (UIKit.UIScrollView scrollView) [0x0000e] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:339
at at (wrapper managed-to-native) ObjCRuntime.Messaging:void_objc_msgSend_CGPoint (intptr,intptr,CoreGraphics.CGPoint)
at UIKit.UIScrollView.set_ContentOffset (CoreGraphics.CGPoint value) [0x00010] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/build/ios/native/UIKit/UIScrollView.g.cs:387
at XLPagerTabStrip.PagerTabStripViewController.UpdateContent () [0x00068] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:247
at XLPagerTabStrip.PagerTabStripViewController.Scrolled (UIKit.UIScrollView scrollView) [0x0000e] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/XLPagerTabStrip/PagerTabStripViewController.cs:339
at at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:79
at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00038] in /Users/builder/data/lanes/3969/7beaef43/source/xamarin-macios/src/UIKit/UIApplication.cs:63
at Rental.iOS.Application.Main (System.String[] args) [0x00008] in /Users/abd/Programming/Gits/Rental/Rental/Rental/Rental.iOS/Main.cs:17
最佳答案
PropertyListViewController does not have a constructor that takes one IntPtr argument.
在您的 UIViewController 子类中,添加一个 .ctor,如下所示:
public partial class PropertyListViewController : UIViewController
{
protected PropertyListViewController(IntPtr handle) : base(handle)
{
// Note: this .ctor should not contain any initialization logic.
}
~~~~
}
关于ios - 找不到此对象的现有托管实例,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42373218/
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