Question

我需要创建一个应用程序，当点击注释时，应用程序会从故事板中打开一个新场景但是当我尝试打开一个新场景时，xamarin会出错。以下是相关代码：

class MyMapDelegate : MKMapViewDelegate
    {
        string pId = "PinAnnotation";

        public override MKAnnotationView GetViewForAnnotation (MKMapView mapView, NSObject annotation)
        { 

            // create pin annotation view
            MKAnnotationView pinView = (MKPinAnnotationView)mapView.DequeueReusableAnnotation (pId);

            if (pinView == null)
                pinView = new MKPinAnnotationView (annotation, pId);

            ((MKPinAnnotationView)pinView).PinColor = MKPinAnnotationColor.Green;
            pinView.CanShowCallout = true;
            pinView.RightCalloutAccessoryView = UIButton.FromType (UIButtonType.DetailDisclosure);
            Console.WriteLine ("anotation view");
            return pinView;
        }

        public override void CalloutAccessoryControlTapped (MKMapView mapView, MKAnnotationView view, UIControl control)
        {

            AboutPodnik aboutPodnik = Storyboard.InstantiateViewController ("AboutPodnik") as AboutPodnik; //cannot acces non-static member
            NavigationController.PushViewController (aboutPodnik, true); //cannot acces non-static member
        }
    }

这是我得到的错误：

Cannot access a nonstatic member of outer type `MonoTouch.UIKit.UIViewController' via nested type `Projekt.Mapa.MyMapDelegate'

Answer 1

您收到错误是因为您无法访问地图视图委托中所需的Storyboard对象，因为您位于视图控制器之外，因此您必须以某种方式返回＆＃34;点击＆＃34;到视图控制器上下文。这是一种方法：

在MyMapDelegate课程中：

class MyMapDelegate : MKMapViewDelegate
{
    public event EventHandler AnnotationTapped;

    public override void CalloutAccessoryControlTapped(MKMapView mapView, MKAnootationView view, UIControl control)
    {
        if (AnnotationTapped != null) {
            AnnotationTapped(view, new EventArgs());
        }
    }
}

然后，在您的视图控制器中：

public override void ViewDidLoad()
{
    base.ViewDidLoad();

    var mapViewDelegate = new MyMapDelegate();
    mapViewDelegate.AnnotationTapped += TheMapView_OnAnnotationTapped;

    // Replace 'TheMapView' with whatever your MKMapView control is named
    TheMapView.Delegate = mapViewDelegate;
}

private void TheMapView_OnAnnotationTapped(object sender, EventArgs args)
{
    AboutPodnik aboutPodnik = Storyboard.InstantiateViewController ("AboutPodnik") as AboutPodnik;
    NavigationController.PushViewController (aboutPodnik, true);
}

xamarin ios地图注释打开新场景

1 个答案: