Question

我有固定位置的纬度和经度。我想检查另一个位置（纬度和经度）是否足够靠近固定位置（50-100米）。我使用iPhone获取当前位置。

Answer 1

CLLocation 的方法– distanceFromLocation:正是您所需要的。

Answer 2

distanceFromCurrentLocation = [userLocation distanceFromLocation:destinationlocation]/convertToKiloMeter;
if(distanceFromCurrentLocation < 100 && distanceFromLocation > .500)
{
    NSLog(@"Yeah, this place is inside my circle");
}
else
{
    NSLog(@"Oops!! its too far");
}

这可以找到空中距离，或者我们可以说是直线距离希望你不要寻找道路距离。

Answer 3

CLLocation *location;// = init...;
double distance = [location distanceFromLocation:otherLoc]; //in meters

Answer 4

虽然我Upvoted Empty Stack答案.. 如果您需要更多帮助，请参阅代码..

成为CLLocationManagerDelegate，然后在您的实现类中。

 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{


            int distance = [newLocation distanceFromLocation:oldLocation];
            if(distance >50 && distance <100)
            {

            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Distance"
                                                            message:[NSString stringWithFormat:@"%i meters",distance]
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles:nil];
            [alert show];
            [alert release];
            }
        }
    }

Answer 5

添加到Deepukjayan的答案，使用CLLocation在使用他的答案之前定义引用：

CLLocation *montreal = [[CLLocation alloc] initWithLatitude:45.521731 longitude:-73.628679];

Answer 6

func distance(from location: CLLocation) -> CLLocationDistance

Documentation

Answer 7

这是在Swift中使用CoreLocation进行操作的方法。您只需使用.distance(from: )类型的CLLocation方法比较两个不同的位置。确保两个位置的类型均为CLLocation

import CoreLocation

let someOtherLocation: CLLocation = CLLocation(latitude: someOtherLat,
                                               longitude: someOtherLon)

guard let usersCurrentLocation: CLLocation = locationManager.location else { return }

                                                       // **the distance(from: ) is right here **
let distanceInMeters: CLLocationDistance = usersCurrentLocation.distance(from: someOtherLocation)

if distanceInMeters < 100 {

    // this user is pretty much in the same area as the otherLocation
} else {

   // this user is at least over 100 meters outside the otherLocation
}

这不是必需的，但也许您需要保存经纬度，以便以后进行其他比较。我知道我需要他们

let usersCurrentLat: CLLocationDegrees = currentLocation.coordinate.latitude // not neccessary but this is how you get the lat
let usersCurrentLon: CLLocationDegrees = currentLocation.coordinate.longitude // not neccessary but this is how you get the lon

let someOtherLocationLat: CLLocationDegrees = someOtherLocationLocation.coordinate.latitude // not neccessary but this is how you get the lat
let someOtherLocationLon: CLLocationDegrees = someOtherLocationtLocation.coordinate.longitude // not neccessary but this is how you get the lon


let usersLocation: CLLocation = CLLocation(latitude: usersCurrentLat,
                                           longitude: usersCurrentLon)

let otherLocation: CLLocation = CLLocation(latitude: someOtherLocationLat,
                                           longitude: someOtherLocationLon)

如何检查当前坐标是否在其他坐标的半径范围内

7 个答案: