iphone - 单击引脚注释时如何显示另一个 View

Question

我在我的 pin 注释上添加了一个详细信息按钮。我想去另一个 View 。当我点击它时，以下代码不起作用。我不知道问题出在哪里。

- (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKPinAnnotationView *pinAnnotation = nil;
    if(annotation != mapview.userLocation)
    {
        static NSString *defaultPinID = @"myPin";
        pinAnnotation = (MKPinAnnotationView *)[mapview dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinAnnotation == nil )
            pinAnnotation = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];

        pinAnnotation.canShowCallout = YES;

        //instatiate a detail-disclosure button and set it to appear on right side of annotation
        UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinAnnotation.rightCalloutAccessoryView = infoButton;

    }

    return pinAnnotation;
}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{

    if ([(UIButton*)control buttonType] == UIButtonTypeDetailDisclosure){
    annotationViewController *detailView=[[annotationViewController alloc] initWithNibName:@"annotationViewController" bundle:nil];

    [[self navigationController] pushViewController:detailView animated:YES];
    [detailView release];
}
}

Answer 1

方法 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control 是一个委托(delegate)方法。这就是为什么您需要将 mapview 的委托(delegate)设置为实现此方法的类(此处为 self)，以便调用它。

您还需要告诉类您正在实现 MKMapViewDelegate 方法。为此，在您的 .h 中更改此行:

@interface MyViewController : UIViewController

收件人:

@interface MyViewController : UIViewController <MKMapViewDelegate>

现在应该调用您的方法。