计算两组坐标之间的距离（NSStrings）

Question

我有两组地理坐标，我试图计算它们之间的距离。我已经做了一些挖掘，但无法弄清楚如何去做。我正在尝试获取用户（userLatitude/userLongitude）和地点（placeLatitude/placeLongitude）之间的英里距离。我的坐标存储为NSStrings，如下所示。有谁知道如何做到这一点？谢谢你们！

NSString *userLatitude =[(PDCAppDelegate *)[UIApplication sharedApplication].delegate 
getUserLatitude]; 

NSString *userLongitude =[(PDCAppDelegate *)[UIApplication sharedApplication].delegate 
getUserLongitude]; 

NSString *placeLatitude = [element1 objectForKey:@"placeLatitude"]; 

NSString *placeLongitude = [element1 objectForKey:@"placeLongitude"]; 

Answer 1

这可以帮助你。尝试从纬度创建CLLocation长你有

CLLocation* Location1; 
CLLocation* Location2; 
CLLocationDistance distance = [Location1 distanceFromLocation:Location2]; 

Answer 2

从下面你可以得到的距离。

CLLocation *locA = [[CLLocation alloc] initWithLatitude:currentLocation.latitude longitude:currentLocation.longitude]; 

CLLocation *locB = [[CLLocation alloc] initWithLatitude:[[element1 objectForKey:@"placeLatitude"] doubleValue] longitude:[[element1 objectForKey:@"placeLongitude"] doubleValue]]; 

CLLocationDistance currentDistance = [locA distanceFromLocation:locB];