本文介绍了iOS刷新mapview上的注释的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
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？
I have a mapview where the annotation's coordinates are constantly being updated but when I use setCoordinate, the annotation does not move. How do I refresh the annotations to reflect their coordinates?
- (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 {
}
}];
}
推荐答案
更新（以反映解决方案） ）：
Updated (to reflect the solution):
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。
Having your own custom annotations and implementing setCoordinate and/or synthesizing coordinate may cause issues.
来源：
上一个解决方案：
您只需删除所有注释，然后重新添加它们。
You can simply remove all of the annotations and then re-add them.
[mapView removeAnnotations:[mapView.annotations]];
[mapView addAnnotations:(NSArray *)];
或删除它们并逐个重新添加：
or remove them and re-add them one by one:
for (id<MKAnnotation> annotation in mapView.annotations)
{
[mapView removeAnnotation:annotation];
// change coordinates etc
[mapView addAnnotation:annotation];
}
这篇关于iOS刷新mapview上的注释的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！