ios - 更改pincolor后无法显示注释标题

Question

我用这段代码改变了注释的颜色，但是之后，标题和副标题无法显示，我该如何解决这个问题？

代码是:

- (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation 
{   
  static NSString *defaultPinID = @"LYB"; 
    MKPinAnnotationView *customPinview = (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID]; 
    if ( customPinview == nil ) {
        customPinview = [[[MKPinAnnotationView alloc] 
                    initWithAnnotation:from reuseIdentifier:defaultPinID] autorelease]; 
    }
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;
    if ([[annotation title] isEqualToString:@"the first"]) {
        customPinview.pinColor = MKPinAnnotationColorGreen;
    }
    return customPinview;
}

Answer 1

在“return customPinview”前新一行添加如下代码:

customPinview.canShowCallout = YES;