我想缩放地图视图以显示最近注释中的至少一个注释，并尽可能显示最大的缩放比例和用户位置。我尝试了以下方法:
-(void)zoomToFitNearestAnnotationsAroundUserLocation {
MKMapPoint userLocationPoint = MKMapPointForCoordinate(self.restaurantsMap.userLocation.coordinate);
MKCoordinateRegion region;
if ([self.restaurantsMap.annotations count] > 1) {
for (id<MKAnnotation> annotation in self.restaurantsMap.annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
CLLocationDistance distanceBetweenAnnotationsAndUserLocation = MKMetersBetweenMapPoints(annotationPoint, userLocationPoint);
region = MKCoordinateRegionMakeWithDistance(self.restaurantsMap.userLocation.coordinate, distanceBetweenAnnotationsAndUserLocation, distanceBetweenAnnotationsAndUserLocation);
}
[self.restaurantsMap setRegion:region animated:YES];
}
}
我如何设法保存2-3个最近的距离并根据该信息创建区域？
最佳答案
如果您正在为iOS 7及更高版本进行开发，则可以保存一个注释数组，按用户位置和注释之间的距离排序，然后获取前三个注释。有了这些标签后，您就可以使用showAnnotations:animated:定位地图了，以便所有注释都可见。
这是另一种方式(取自here):
MKMapRect zoomRect = MKMapRectNull;
for (id <MKAnnotation> annotation in mapView.annotations)
{
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
zoomRect = MKMapRectUnion(zoomRect, pointRect);
}
[mapView setVisibleMapRect:zoomRect animated:YES];
//You could also update this to include the userLocation pin by replacing the first line with
MKMapPoint annotationPoint = MKMapPointForCoordinate(mapView.userLocation.coordinate);
MKMapRect zoomRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
当然，您必须更新第二个解决方案以仅使用最接近的注释点，但是您已经知道如何找到这些注释点，因此这不是问题。
关于ios - MKMapView-缩放以适合用户位置附近的最近注释，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21606828/