按下按钮时如何调用此方法

Question

按动态按钮时如何调用以下方法？

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

Answer 1

这是地图视图的委托方法，因此您的代码不会直接调用它。当点击注释视图的rightCalloutAccessoryView或leftCalloutAccessoryView时，地图视图会调用该方法。

创建地图视图时，设置其委托属性，并在viewForAnnotation方法中，创建一个按钮并将其设置为rightCalloutAccessoryView或leftCalloutAccessoryView。

例如：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    static NSString *annotationIdentifier = @"annot";
    MKPinAnnotationView *pav = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];
    if (!pav)
    {
        pav = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationIdentifier] autorelease];
        pav.canShowCallout = YES;
        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pav.rightCalloutAccessoryView = rightButton;
    }
    else {
        pav.annotation = annotation;
    }

    return pav;
}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    //handle tap on annotation...
}