我在我的 map 上放置了 1-12 个地标。我在计算最外面的两个点时遇到问题,因此我无法缩小 map 以显示所有图钉。
CLLocationDistance distLong = [zoomLocationMax.longitude getDistanceFrom:zoomLocationMin.longitude];
CLLocationDistance distLat = [zoomLocationMax.latitude getDistanceFrom:zoomLocationMin.latitude];
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(m_MapView.userLocation.coordinate, distLat, distLong);
MKCoordinateRegion adjustedRegion = [m_MapView regionThatFits:viewRegion];
m_MapView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
[m_MapView setRegion:adjustedRegion animated:YES];
我一直在愚弄上面的代码,但我可以预见到一些问题:
1) 前两行给我一个 Bad receiver type 'CLLocationDegres' (aka double'} 错误。 2) 我真的不想以用户位置为中心点,理想情况下我希望有两个最远点的中心。
任何代码片段、示例或解释都会有很大帮助!!
谢谢
编辑以显示如何计算 zoomLocatin。我基本上采用对数和纬度并确定最小值和最大值...也不确定这是否正确:
CLLocationCoordinate2D zoomLocationMin;
CLLocationCoordinate2D zoomLocationMax;
if (coordinate.latitude < zoomLocationMin.latitude)
zoomLocationMin.latitude = coordinate.latitude;
if (coordinate.longitude < zoomLocationMin.longitude)
zoomLocationMin.longitude = coordinate.longitude;
if (coordinate.latitude > zoomLocationMax.latitude)
zoomLocationMax.latitude = coordinate.latitude;
if (coordinate.longitude > zoomLocationMax.longitude)
zoomLocationMax.longitude = coordinate.longitude;
最佳答案
也许您应该尝试使用此代码来完美匹配您的地标:
- (void)zoomMapViewToFitAnnotations:(MKMapView *)mapView animated:(BOOL)animated
{
NSArray *annotations = mapView.annotations;
int count = [mapView.annotations count];
if ( count == 0) { return; } //return if no annotations
//convert NSArray of id <MKAnnotation> into an MKCoordinateRegion that can be used to set the map size
//can't use NSArray with MKMapPoint because MKMapPoint is not an id
MKMapPoint points[count]; //C array of MKMapPoint struct
for( int i=0; i<count; i++ ) //load points C array by converting coordinates to points
{
CLLocationCoordinate2D coordinate = [(id <MKAnnotation>)[annotations objectAtIndex:i] coordinate];
points[i] = MKMapPointForCoordinate(coordinate);
}
//create MKMapRect from array of MKMapPoint
MKMapRect mapRect = [[MKPolygon polygonWithPoints:points count:count] boundingMapRect];
//convert MKCoordinateRegion from MKMapRect
MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect);
//add padding so pins aren't scrunched on the edges
region.span.latitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
region.span.longitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
//but padding can't be bigger than the world
if( region.span.latitudeDelta > MAX_DEGREES_ARC ) { region.span.latitudeDelta = MAX_DEGREES_ARC; }
if( region.span.longitudeDelta > MAX_DEGREES_ARC ){ region.span.longitudeDelta = MAX_DEGREES_ARC; }
//and don't zoom in stupid-close on small samples
if( region.span.latitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.latitudeDelta = MINIMUM_ZOOM_ARC; }
if( region.span.longitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.longitudeDelta = MINIMUM_ZOOM_ARC; }
//and if there is a sample of 1 we want the max zoom-in instead of max zoom-out
if( count == 1 )
{
region.span.latitudeDelta = MINIMUM_ZOOM_ARC;
region.span.longitudeDelta = MINIMUM_ZOOM_ARC;
}
[mapView setRegion:region animated:animated];
}
因此,您必须定义 Padding、Maximum degree arc 和 Minimum zoom arc。对于前。应该是这样的:
#define MINIMUM_ZOOM_ARC 0.05 //approximately 1 miles (1 degree of arc ~= 69 miles)
#define ANNOTATION_REGION_PAD_FACTOR 1.25
#define MAX_DEGREES_ARC 360
希望你会喜欢,干杯
关于iphone - 使用CLLocationDistance计算最外层坐标?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14056556/