用户位置引脚的自定义注释

Question

似乎可以更改用户位置注释图像。 如果...

也许有人能看出我错在哪里

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        NSString* AnnotationIdentifier = @"Annotation";
        MKAnnotationView *annoationView = [mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
        [annoationView setImage:[UIImage imageNamed:@"melocation"] ];
        return annoationView;
    }
}

Answer 1

注解无法出队时第一次忘记初始化：

-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        static NSString* const kAnnotationIdentifier = @"Annotation";
        MKAnnotationView *annoationView = [mapView dequeueReusableAnnotationViewWithIdentifier:kAnnotationIdentifier];
        if (!annoationView) {
            annoationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:kAnnotationIdentifier];
        }
        [annoationView setImage:[UIImage imageNamed:@"melocation"] ];
        return annoationView;
    }
    return nil;
}