我有一个mapview,其中注释的坐标不断更新,但是当我使用setCoordinate时,注释不会移动.如何刷新注释以反映其坐标？
- (void)updateUnits {
PFQuery *query = [PFQuery queryWithClassName:@"devices"];
[query whereKeyExists:@"location"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects,NSError *error) {
if (!error) {
for (PFObject *row in objects) {
PFGeoPoint *geoPoint = [row objectForKey:@"location"];
CLLocationCoordinate2D coord = { geoPoint.latitude,geoPoint.longitude };
for (id<MKAnnotation> ann in mapView.annotations) {
if ([ann.title isEqualToString:[row objectForKey:@"deviceid"]]) {
[ann setCoordinate:coord];
NSLog(@"latitude is: %f",coord.latitude);
NSLog(@"Is called");
break;
}
else {
//[self.mapView removeAnnotation:ann];
}
}
}
}
else {
}
}];
}
解决方法
更新(以反映解决方案)：
拥有自己的自定义注释并实现setCoordinate和/或合成坐标可能会导致问题.
以前的方案：
[mapView removeAnnotations:[mapView.annotations]]; [mapView addAnnotations:(NSArray *)];
for (id<MKAnnotation> annotation in mapView.annotations)
{
[mapView removeAnnotation:annotation];
// change coordinates etc
[mapView addAnnotation:annotation];
}
