Question

当我打电话给这一行时：

((UIImagePickerController)sender).DismissViewController (true, () => {});

我收到此错误。请帮忙

MonoTouch.Foundation.MonoTouchException: Objective-C exception thrown.  Name: NSInvalidArgumentException Reason: -[UIImagePickerController dismissViewControllerAnimated:completion:]: unrecognized selector sent to instance 0xb647ed0
    at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSend_bool_IntPtr (intptr,intptr,bool,intptr)
    at MonoTouch.UIKit.UIViewController.DismissViewController (Boolean animated, MonoTouch.Foundation.NSAction completionHandler) [0x00036] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIViewController.g.cs:678
    at ECPIInstructorObservationForm.Section1.Handle_FinishedPickingMedia (System.Object sender, MonoTouch.UIKit.UIImagePickerMediaPickedEventArgs e) [0x00142] in /Users/kjohnson/Projects/ECPIInstructorObservationForm/ECPIInstructorObservationForm/Section1.cs:298
    at MonoTouch.UIKit.UIImagePickerController+_UIImagePickerControllerDelegate.FinishedPickingMedia (MonoTouch.UIKit.UIImagePickerController picker, MonoTouch.Foundation.NSDictionary info) [0x00014] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIImagePickerController.g.cs:601
    at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
    at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
    at ECPIInstructorObservationForm.Application.Main (System.String[] args) [0x00000] in /Users/kjohnson/Projects/ECPIInstructorObservationForm/ECPIInstructorObservationForm/Main.cs:17

Answer 1

iOS 5.0中引入了dismissViewControllerAnimated:completion:选择器 - 您是否在较早的iOS版本上运行？

<强>更新

我刚尝试运行此代码：

var picker = new UIImagePickerController ();
picker.DismissViewController (true, () => Console.WriteLine ("foo!"));

它在我的机器上运行得很好，这意味着您显示的代码不足以重现您所看到的问题 - 所以也许您可以展示您的创建和使用方式图像选择器？

Answer 2

使用DismissViewController完成处理程序是可行的方法

picker.DismissViewController (true,() => {
    var labelPicsViewController = new LabelPicsViewController();
    PresentViewController(labelPicsViewController,true,null);
});

dismissViewControllerAnimated：completion：]：无法识别的选择器发送到实例 - Monotouch

2 个答案: