iOS 计算两个坐标之间的距离

//第一个坐标

CLLocation *before=[[CLLocation alloc] initWithLatitude:29.553968 longitude:106.538872];

//第二个坐标

CLLocation *current=[[CLLocation alloc] initWithLatitude:29.552959 longitude:106.537199];

// 计算距离

CLLocationDistance meters=[current distanceFromLocation:before];

NSLog(@"-------%lf",meters);