将缩略图添加到MKPinAnnotation

时间:2013-05-14 17:33:30

标签: ios uiimage mkpinannotationview

我有这个自定义MKPinAnnotation我需要添加图像(像缩略图)。我也应该能够通过点击它来打开全屏图像。这样做的最佳方法是什么?

1 个答案:

答案 0 :(得分:1)

有几点想法。

  1. 如果您不想在地图上添加图钉,而是需要一些自定义图像,则可以设置地图的委托,然后编写一个viewForAnnotation来执行以下操作:

    - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
    {
        if ([annotation isKindOfClass:[CustomAnnotation class]])
        {
            static NSString * const identifier = @"MyCustomAnnotation";
    
            // if you need to access your custom properties to your custom annotation, create a reference of the appropriate type:
    
            CustomAnnotation *customAnnotation = annotation;
    
            // try to dequeue an annotationView
    
            MKAnnotationView* annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
    
            if (annotationView)
            {
                // if we found one, update its annotation appropriately
    
                annotationView.annotation = annotation;
            }
            else
            {
                // otherwise, let's create one
    
                annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
                                                              reuseIdentifier:identifier];
    
                annotationView.image = [UIImage imageNamed:@"myimage"];
    
                // if you want a callout with a "disclosure" button on it
    
                annotationView.canShowCallout = YES;
                annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    
                // If you want, if you're using QuartzCore.framework, you can add
                // visual flourishes to your annotation view:
                //
                // [annotationView.layer setShadowColor:[UIColor blackColor].CGColor];
                // [annotationView.layer setShadowOpacity:1.0f];
                // [annotationView.layer setShadowRadius:5.0f];
                // [annotationView.layer setShadowOffset:CGSizeMake(0, 0)];
                // [annotationView setBackgroundColor:[UIColor whiteColor]];
            }
    
            return annotationView;
        }
    
        return nil;
    }
    
  2. 如果您使用标准标注(如上所示),您可以告诉地图当用户点击标注的披露按钮时您想要做什么:

    - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
    {
        if (![view.annotation isKindOfClass:[CustomAnnotation class]])
            return;
    
        // do whatever you want to do to go to your next view
    }
    
  3. 如果您真的想要通过其公开按钮绕过标注,而是在点击注释视图时直接转到另一个视图控制器,您会:

  4. 有关详细信息,请参阅位置感知编程指南中的Annotating Maps