[英]Find closest longitude and latitude in array from user location - iOS Swift
在此处发布的问题中,用户询问:
我有一个充满经度和纬度的数组。 我的用户位置有两个双精度变量。 我想根据数组测试用户位置之间的距离,以查看哪个位置最近。 我该怎么做呢?
这将获得2个位置之间的距离,但努力了解如何针对一系列位置对其进行测试。
作为响应,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);
在我正在处理的应用程序中,我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,我正在使用Swift,并且此代码在Objective-C中。
我唯一的问题是:在Swift中应该如何显示?
谢谢你的帮助。 我对所有这些都是新手,看到Swift中的这段代码可能会大有帮助。
对于Swift 3,我创建了这一小段“功能”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) })
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
}
func closestLoc(userLocation:CLLocation){
var distances = [CLLocationDistance]()
for location in locations{
let coord = CLLocation(latitude: location.latitude!, longitude: location.longitude!)
distances.append(coord.distance(from: userLocation))
print("distance = \(coord.distance(from: userLocation))")
}
let closest = distances.min()//shortest distance
let position = distances.index(of: closest!)//index of shortest distance
print("closest = \(closest!), index = \(position)")
}
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