Question

我一直关注此tutorial来显示自定义注释标注气泡。如果您只有一个带有自定义注释视图的注释，则它可以完美地工作。

但是，我需要在地图上有更多内容，而且从自定义注释视图切换到另一个注意视图时遇到麻烦。如果我在选择了已经选择的其他引脚并且想要显示新的自定义注释视图时单击另一个引脚，则它不起作用。我首先在mapview上随机点击其他地方。我想我在DidDeselect方法中有一些工作要做，但我不确定......

你会如何解决这个问题？

- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view {
    if (self.calloutAnnotation && [view.annotation isKindOfClass:[MyHomeAnnotation class]]) {
        [self.mapView removeAnnotation: self.calloutAnnotation];
    }
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
     if ([view.annotation isKindOfClass:[MyHomeAnnotation class]]) { 
        if (self.calloutAnnotation == nil) {
            self.calloutAnnotation = [[CalloutMapAnnotation alloc] initWithLatitude:view.annotation.coordinate.latitude
                                                                       andLongitude:view.annotation.coordinate.longitude];
        } else {
            self.calloutAnnotation.latitude = view.annotation.coordinate.latitude;
            self.calloutAnnotation.longitude = view.annotation.coordinate.longitude;
        }
        [self.mapView addAnnotation:self.calloutAnnotation];
        self.selectedAnnotationView = view;
    }
}



- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    if (annotation == self.calloutAnnotation) {
        CalloutMapAnnotationView *calloutMapAnnotationView = (CalloutMapAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:@"CalloutAnnotation"];
        if (!calloutMapAnnotationView) {
            calloutMapAnnotationView = [[[CalloutMapAnnotationView alloc] initWithAnnotation:annotation 
                                                                             reuseIdentifier:@"CalloutAnnotation"] autorelease];
            calloutMapAnnotationView.contentHeight = 78.0f;
            UIImage *asynchronyLogo = [UIImage imageNamed:@"cykelrød1.png"];
            UIImageView *asynchronyLogoView = [[[UIImageView alloc] initWithImage:asynchronyLogo] autorelease];
            asynchronyLogoView.frame = CGRectMake(5, 2, asynchronyLogoView.frame.size.width, asynchronyLogoView.frame.size.height);
            [calloutMapAnnotationView.contentView addSubview:asynchronyLogoView];
        }
        calloutMapAnnotationView.parentAnnotationView = self.selectedAnnotationView;
        calloutMapAnnotationView.mapView = self.mapView;
        return calloutMapAnnotationView;
    } else if ([annotation isKindOfClass:[MyHomeAnnotation class]]) {
        MKPinAnnotationView *annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation 
                                                                               reuseIdentifier:@"CustomAnnotation"] autorelease];
        annotationView.canShowCallout = NO;
        annotationView.pinColor = MKPinAnnotationColorGreen;
        return annotationView;
    }else if ([annotation isKindOfClass:[MyMapAnnotation class]]) {
        MKPinAnnotationView *annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation 
                                                                               reuseIdentifier:@"NormalAnnotation"] autorelease];
        annotationView.canShowCallout = YES;
        annotationView.pinColor = MKPinAnnotationColorPurple;
        return annotationView;
    }


    return nil;
}

Answer 1

这是我的解决方案，我使用纬度和经度来区分应从mapview中删除哪个标注。希望这会有所帮助。

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view {
   NSLog(@"didSelectAnnotationView:%f", view.annotation.coordinate.latitude);

   if (self.calloutAnnotation == nil) {

      CalloutMapAnnotation *tempCallout = [[CalloutMapAnnotation alloc] 
                                         initWithLatitude:view.annotation.coordinate.latitude              
                                         andLongitude:view.annotation.coordinate.longitude];

      self.calloutAnnotation = tempCallout;
      [tempCallout release];

  } else {

      //remove callout when callout already exist
      [self.myMapView removeAnnotation: self.calloutAnnotation];
      self.selectedAnnotationView = nil;

      //reposition
      self.calloutAnnotation.latitude = view.annotation.coordinate.latitude;
      self.calloutAnnotation.longitude = view.annotation.coordinate.longitude;

  }

  [self.myMapView addAnnotation:self.calloutAnnotation];
  self.selectedAnnotationView = view;
}

- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view   {

  NSLog(@"didDeselectAnnotationView:%f", view.annotation.coordinate.latitude);

  //use the latitude and longitude to avoid remove twice

  if (self.calloutAnnotation &&
    self.selectedAnnotationView.annotation.coordinate.latitude == view.annotation.coordinate.latitude &&
    self.selectedAnnotationView.annotation.coordinate.longitude == view.annotation.coordinate.longitude
    ) {

      [self.myMapView removeAnnotation: self.calloutAnnotation];
      self.selectedAnnotationView = nil;
      self.calloutAnnotation.isAddtoMap = NO;
  }

}

在MKMap中从自定义标注跳转到另一个标注

1 个答案: