使用CLLocation计算距离iOS MapKit [英] Calculating Distance iOS MapKit Using CLLocation

问题描述

我正在尝试使用经度和纬度来查找距离(以英里为单位).我有以下方法:

I am trying to find the distance in miles using the latitude and longitude. I have the following method:

- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation
{
    if(!newLocation) return; 

    if ((oldLocation.coordinate.latitude != newLocation.coordinate.latitude) &&
        (oldLocation.coordinate.longitude != newLocation.coordinate.longitude))
    {



        CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:oldLocation.coordinate.latitude longitude:oldLocation.coordinate.longitude];
        CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.latitude];

        CLLocationDistance distance = ([loc2 distanceFromLocation:loc1]) * 0.000621371192;

        //distance = distance; 

        NSLog(@"Total Distance %f in miles",distance);
    }

}

由于某种原因，它会打印出5678.32英里.该位置几乎是静止不动的.

For some reason it prints out something like 5678.32 miles. The location is pretty much stationary and not moving at all.

推荐答案

CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.(!!!!!)latitude longitude:newLocation.coordinate.(!!!!!)latitude];

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