没有调用ViewForAnnotation [英] ViewForAnnotation is not being called

问题描述

我正在尝试制作一张地图，在这里我可以看到我的当前位置，并看到这条街叫什么.

I am trying to make a map, where I can see my current location, and see what the street is called.

到目前为止，我可以在地图上画图钉，但是由于某种原因，我没有收到标注. 并且我在viewForAnnotation方法中放置了一个NSLog，但是没有被调用，所以我无法对其进行测试.

so far, I am able to put a pin on my map, but for some reason, I am not getting the callout. and I have put a NSLog in my viewForAnnotation method, but it is not being called, so i wasn't able to test it.

有人可以帮助我吗?

-(void)lat:(float)lat lon:(float)lon
{
    CLLocationCoordinate2D location;
    location.latitude = lat;
    location.longitude = lon;
    NSLog(@"Latitude: %f, Longitude: %f",location.latitude, location.longitude);
    //One location is obtained.. just zoom to that location

    MKCoordinateRegion region;
    region.center=location;
    //Set Zoom level using Span
    MKCoordinateSpan span;
    span.latitudeDelta=.005f;
    span.longitudeDelta=.005f;
    region.span=span;
    [map setRegion:region animated:TRUE];

    //MKReverseGeocoder *geocoder=[[MKReverseGeocoder alloc] initWithCoordinate:location];
    //geocoder.delegate=self;
    //[geocoder start];
    if (cPlacemark != nil) {
        [map removeAnnotation:cPlacemark];
    }
    cPlacemark=[[CustomPlacemark alloc] initWithCoordinate:location];
    cPlacemark.title = mPlacemark.thoroughfare;
    cPlacemark.subtitle = mPlacemark.locality;
    [map addAnnotation:cPlacemark];
    [cPlacemark release];

    [mLocationManager stopUpdatingLocation];
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MKUserLocation class]])
    return nil;

// try to dequeue an existing pin view first
if ([annotation isKindOfClass:[CustomPlacemark class]]){
MKPinAnnotationView *pinView=(MKPinAnnotationView *)[map dequeueReusableAnnotationViewWithIdentifier:@"customIdentifier"];

if (!pinView)
{
    // if an existing pin view was not available, create one
    MKPinAnnotationView* cPinAnnoView = [[[MKPinAnnotationView alloc]
                                           initWithAnnotation:annotation reuseIdentifier:@"customIdentifier"] autorelease];
    cPinAnnoView.pinColor = MKPinAnnotationColorPurple;
    cPinAnnoView.animatesDrop = YES;
    cPinAnnoView.canShowCallout = YES;
    // Add button
    UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [leftButton addTarget:self action:@selector(annotationViewClick:) forControlEvents:UIControlEventTouchUpInside];
    cPinAnnoView.leftCalloutAccessoryView = leftButton;

} else
    {
        pinView.annotation = annotation;
    }
    return pinView; 
}
return nil;

}

现在，我已经将我的viewForAnnotation定制为这样. 但是我仍然无法从图钉中收到标注，图钉仍然保持红色. 但这应该是一无所有的紫色

Right now I have customized my viewForAnnotation to be like this. But I still can't get a callout from my pin and the pin remains red. But it should be purple of nothing at all

推荐答案

我遇到了同样的问题，即没有将MapView委托设置为文件所有者.

I had the same problem which was not setting the MapView delegate to the File Owner.

1. 打开笔尖
2. 右键单击MapView
3. 将委托拖动到文件的所有者

这篇关于没有调用ViewForAnnotation的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！