[英]Distance between 2 points with CLLocationCoordinate2D
I'm trying to measure the distance between two coordinates on a map (longitude, latitude). 我正在尝试测量地图上两个坐标(经度,纬度)之间的距离。 The first coordinate is my current location which is a
CLLocation
, and the other one is a pin on the map which is of type CLLocationCoordinate2D
. 第一个坐标是我当前的位置 ,它是一个
CLLocation
,另一个坐标是地图上的一个类型为CLLocationCoordinate2D
的引脚。
I call distanceFromLocation
to get my current location in CLLocation
but it says bad receiver type from CLLocationCoordinate2D
. 我调用
distanceFromLocation
来获取CLLocation
当前位置,但它表示来自CLLocationCoordinate2D
接收器类型不正确。
CLLocationCoordinate2D locationCoordinate;
// Set the latitude and longitude
locationCoordinate.latitude = [[item objectForKey:@"lat"] doubleValue];
locationCoordinate.longitude = [[item objectForKey:@"lng"] doubleValue];
CLLocationDistance dist = [locationCoordinate distanceFromLocation:locationManager.location.coordinate]; // bad receiver type from CLLocationCoordinate2D
I want to find the distance between these 2 coordinates in metric unit, and I know that types are mismatching, but how to convert them so I can find the distance between these 2 nodes? 我想以公制单位找到这两个坐标之间的距离,我知道类型不匹配,但是如何转换它们以便我可以找到这两个节点之间的距离?
Use the below method for finding distance between two locations 使用以下方法查找两个位置之间的距离
-(float)kilometersfromPlace:(CLLocationCoordinate2D)from andToPlace:(CLLocationCoordinate2D)to {
CLLocation *userloc = [[CLLocation alloc]initWithLatitude:from.latitude longitude:from.longitude];
CLLocation *dest = [[CLLocation alloc]initWithLatitude:to.latitude longitude:to.longitude];
CLLocationDistance dist = [userloc distanceFromLocation:dest]/1000;
//NSLog(@"%f",dist);
NSString *distance = [NSString stringWithFormat:@"%f",dist];
return [distance floatValue];
}
For example: 例如:
+(double)distanceFromPoint:(double)lat lng:(double)lng
{
CLLocation *placeLocation = [[CLLocation alloc] initWithLatitude:lat longitude:lng];
CLLocationCoordinate2D usrLocation = locationManager.location;
CLLocation * userLocation = [[CLLocation alloc] initWithLatitude:usrLocation.latitude longitude:usrLocation.longitude];
double meters = [userLocation distanceFromLocation:placeLocation];
return meters;
}
Try to convert CLLocationCoordinate2D
to CLLocation
, 尝试将
CLLocationCoordinate2D
转换为CLLocation
,
Create a CLLocation
object using, 使用,创建一个
CLLocation
对象,
-(id)initWithLatitude:(CLLocationDegrees)latitude longitude:(CLLocationDegrees)longitude
Based on @manujmv's answer above, here's a Swift extension (returns metres): 基于@ manujmv上面的答案,这里是一个Swift扩展(返回米):
import Foundation
import CoreLocation
extension CLLocationCoordinate2D {
func distanceTo(coordinate: CLLocationCoordinate2D) -> CLLocationDistance {
let thisLocation = CLLocation(latitude: self.latitude, longitude: self.longitude)
let otherLocation = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
return thisLocation.distanceFromLocation(otherLocation)
}
}
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