从用户位置查找数组中最接近的经度和纬度 – iOS Swift

发布的问题中,用户问：

I have an array full of longitudes and latitudes. I have two double variables with my users location. I’d like to test the distance between my user’s locations against my array to see which location is the closest. How do I do this?
This will get the distance between 2 location but stuggeling to understand how I’d test it against an array of locations.

作为回应,他得到了以下代码：

NSArray *locations = //your array of CLLocation objects
CLLocation *currentLocation = //current device Location

CLLocation *closestLocation;
CLLocationDistance smallestDistance = DBL_MAX; // set the max value

for (CLLocation *location in locations) {
    CLLocationDistance distance = [currentLocation  distanceFromLocation:location];

    if (distance < smallestDistance) {
        smallestDistance = distance;
        closestLocation = location;
    }
}
NSLog(@"smallestDistance = %f", smallestDistance);

我在我正在处理的应用程序中遇到完全相同的问题,我认为这段代码可以完美地运行.但是,我正在使用Swift,此代码在Objective-C中.

我唯一的问题是：它应该如何看待Swift？

谢谢你的帮助.我是所有这一切的新手,看到Swift中的这段代码可能是一个很大的问题.

var closestLocation: CLLocation?
var smallestDistance: CLLocationDistance?

for location in locations {
  let distance = currentLocation.distanceFromLocation(location)
  if smallestDistance == nil || distance < smallestDistance {
    closestLocation = location
    smallestDistance = distance
  }
}

print("smallestDistance = \(smallestDistance)")

或作为一种功能：

func locationInLocations(locations: [CLLocation], closestToLocation location: CLLocation) -> CLLocation? {
  if locations.count == 0 {
    return nil
  }

  var closestLocation: CLLocation?
  var smallestDistance: CLLocationDistance?

  for location in locations {
    let distance = location.distanceFromLocation(location)
    if smallestDistance == nil || distance < smallestDistance {
      closestLocation = location
      smallestDistance = distance
    }
  }

  print("closestLocation: \(closestLocation), distance: \(smallestDistance)")
  return closestLocation
}