MKAnnotationView不显示标注 [英] MKAnnotationView doesn't show callout

问题描述

我想让一个MKMapView显示一个带有标注气泡的图钉。

I'm trying to get an MKMapView to show a pin with a callout bubble. I get the pin to display, but I just cant figure out how to display the callout.

有我的代码：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation {
    if (annotation == mapView.userLocation) {
        return nil;
    }
    MKPinAnnotationView *pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Pin"];
    pinView.pinColor = MKPinAnnotationColorGreen;
    [pinView setCanShowCallout:YES];
    pinView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    pinView.animatesDrop = YES;
    [self performSelector:@selector(displayPinCallOutView) withObject:nil afterDelay:0.3];
    return pinView;
}

推荐答案

获取要在地图中添加注释后显示的标注，您必须在 didAddAnnotationViews 委托方法中执行：

If you're trying to get the callout to display as soon as the annotation is added to the map, you have to do it in the didAddAnnotationViews delegate method:

-(void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
    //Get reference to annotation you want to select...
    //You could search through mapView.annotations array
    //or keep ivar reference to it.
    id<MKAnnotation> annToSelect = ...

    [mapView selectAnnotation:annToSelect animated:YES];
}

删除 performSelector 从 viewForAnnotation 方法。

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