ios - 从用户位置查找数组中最近的经度和纬度 - iOS Swift

Question

在发布的问题中here ，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，他得到了如下代码:

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了完全相同的问题，我认为这段代码可以完美地工作。但是，我使用的是 Swift，并且此代码是在 Objective-C 中。

我唯一的问题是:它在 Swift 中应该是什么样子？

感谢您的帮助。我对这一切都不熟悉，看到这段 Swift 代码可能会大有作为。

Answer 1

对于 Swift 3，我创建了这段“功能性”代码:

let coord1 = CLLocation(latitude: 52.12345, longitude: 13.54321)
let coord2 = CLLocation(latitude: 52.45678, longitude: 13.98765)
let coord3 = CLLocation(latitude: 53.45678, longitude: 13.54455)

let coordinates = [coord1, coord2, coord3]

let userLocation = CLLocation(latitude: 52.23678, longitude: 13.55555)

let closest = coordinates.min(by: 
{ $0.distance(from: userLocation) < $1.distance(from: userLocation) })