pin drop animation

Michael picture Michael · Sep 23, 2011 · Viewed 8.2k times · Source

The default pin drop animation doesn't work in my app, here is some code I wrote:

- (void)viewDidLoad {
    /*
        some code...
    */
    [theMapView addAnnotation:addAnnotation];
    [addAnnotation release];
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
    MKPinAnnotationView *annoView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation 
                                                            reuseIdentifier:@"current"];
    annoView.animatesDrop = YES;
    annoView.pinColor = MKPinAnnotationColorGreen;
    return annoView;
}

Right now the pin just appear in the screen as default red one without any animation, the MKMapViewDelegate protocol has been adopted, anyone can see what's wrong here?

Answer

iNoob picture iNoob · Sep 23, 2011

First use:

[yourMap_view setDelegate:self];

in ViewDidLoad

Then call this for the drop animation :

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
MKPinAnnotationView *pinView = nil;
if(annotation!= map_view.userLocation)
{
    static NSString *defaultPin = @"pinIdentifier";
    pinView = (MKPinAnnotationView*)[map_view dequeueReusableAnnotationViewWithIdentifier:defaultPin];
    if(pinView == nil)
        pinView = [[[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:defaultPin]autorelease];
    pinView.pinColor = MKPinAnnotationColorPurple; //Optional
    pinView.canShowCallout = YES; // Optional
    pinView.animatesDrop = YES;
}
else
{
    [map_view.userLocation setTitle:@"You are Here!"];
}
return pinView;
}