在图钉中放置图钉后，如何更新/更改其颜色？
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我正在做一个贴文，将图钉/注释放在mapview中。当用户接近别针时，我希望别针改变颜色。一切正常，将销钉放置在我想要的位置，当距离足够近时，我会收到一条警报消息。但是我不确定如何更新图钉颜色。我是否需要删除注释并替换它们？似乎不必要，我要寻找的只是某种更新/刷新mapview，而不必替换注释。
CLLocation *place =[[CLLocation alloc] initWithCoordinate:location altitude:1 horizontalAccuracy:1 verticalAccuracy:-1 timestamp:nil];
AddresAnnotation *ann = [[AddresAnnotation alloc] initWithCoordinate:place.coordinate];
[ann setTitle:[rows placeName]];
[mapView addAnnotation:ann];
-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation{
if (annotation != self.mapView.userLocation) {
annView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@\"Plats\"] autorelease];
[annView setPinColor:MKPinAnnotationColorRed];
annView.animatesDrop = TRUE;
annView.canShowCallout = YES;
return annView;
} else {
zoomButton.enabled = TRUE;
return nil;
}
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程琶
for (CLLocation *prox in locations) { NSLog(@\"prox %@\", prox); float distanceFromLocation = [mapView.userLocation.location distanceFromLocation:prox]/1609.344; NSLog(@\"distance %f\", distanceFromLocation); if (distanceFromLocation <= 10) { NearbyLocation *nearbyLocation = [[NearbyLocation alloc]init]; NSString *key = [NSString stringWithFormat:@\"%d\", index]; nearbyLocation.title = [storedTitles objectForKey:key]; nearbyLocation.loction = prox; nearbyLocation.subtitle = [NSString stringWithFormat:@\"%.1f miles away\", distanceFromLocation]; nearbyLocation.lat = prox.coordinate.latitude; nearbyLocation.lon = prox.coordinate.longitude; [newArray addObject:nearbyLocation]; [nearbyLocation release]; } index++; } NSLog(@\"new array %d prox %d\", [newArray count], [proximityOutlet.nearbyLocations count]); if ([newArray count] > [proximityOutlet.nearbyLocations count]) { NSLog(@\"set array\"); // if the new array has actually added any objects, set the array and switch views; proximityOutlet.nearbyLocations = newArray; //[self.navigationController pushViewController:proximityOutlet animated:YES]; proximityOutlet.modalPresentationStyle = UIModalPresentationPageSheet; proximityOutlet.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; [self presentModalViewController:proximityOutlet animated:YES]; } [newArray release]; }if ([mapview.userLocation.location distanceFrom:prox]/1609.334 < (however many miles)){ annotationView = x; }