在初始加载时,注释显示得很好。但是,如果我滚动地图,它们都会消失,并且仅针对用户位置调用代码,而不是 viewForAnnotation 委托方法中的其他注释。
绘图引脚
-(void)viewDidLoad{
...Download Coordinates and Data from Web here...
[self.mapView addAnnotation:pin];
}
委托方法
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
//Player's Pin
if([annotation class] == MKUserLocation.class) {
return nil;
}
//Cluster Pin
if([annotation isKindOfClass:[REVClusterPin class]]){
REVClusterPin *pin = (REVClusterPin *)annotation;
if( [pin nodeCount] > 0 ){
pin.title = @"___";
MKAnnotationView *annotationView = (REVClusterAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:@"cluster"];
if( !annotationView ){
annotationView = (REVClusterAnnotationView*)
[[REVClusterAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"cluster"];
}
annotationView.image = [UIImage imageNamed:@"cluster.png"];
[(REVClusterAnnotationView*)annotationView setClusterText:
[NSString stringWithFormat:@"%i",[pin nodeCount]]];
annotationView.canShowCallout = NO;
return annotationView;
}
}
//Player Pin
if([annotation isKindOfClass:[ZEPointAnnotation class]]){
ZEPointAnnotation *pin = (ZEPointAnnotation *)annotation;
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"pin"];
if(!annotationView){
annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pin"];
}
annotationView.canShowCallout = YES;
annotationView.draggable = NO;
...Create Pin Data Here...
return annotationView;
}
return nil;
}