使用Blue Marble Drop在Google/Apple地图上显示多个用户的位置

Question

默认用户注释(蓝色大理石下降)必须显示第二个用户的拉动位置，以便用户可以获得第二个用户的位置不是静态的，而是在移动中。Pin Annotation类建议该位置是静态的。

我怎样才能做到这一点呢？

Answer 1

-(void)updateLocation
{// this will update your location
    NSString *latitude = @"0.0";
    NSString *longitude=@"0.0";
    MyAnnotation *ann = [[MyAnnotation alloc] initWithLatitude:latitude Longitude:longitude];
    [self.theMapView removeAnnotations:[self.theMapView annotations]];
    [self.theMapView performSelectorOnMainThread:@selector(addAnnotation:) withObject:ann waitUntilDone:YES];

    MKCoordinateRegion region = MKCoordinateRegionMake(CLLocationCoordinate2DMake(0.0, 0.0), MKCoordinateSpanMake(0.1f, 0.1f));
    [self.theMapView setRegion:region];

}

- (MKAnnotationView *) mapView:(MKMapView *)mapView1 viewForAnnotation:(id <MKAnnotation>) annotation{

    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;
    // try to dequeue an existing pin view first
    static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
    MKAnnotationView *pinView = [[MKAnnotationView alloc]
                                  initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier];
    pinView.image = [UIImage imageNamed:@"BlueMarbleDrop"];

    pinView.annotation = annotation;
    return pinView;
}

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