ios - 如何找出坐标之间的距离？

Question

我想让它显示两个 CLLocation 坐标之间的距离。没有复杂的数学公式有没有办法做到这一点？如果没有公式，你会怎么做？

score 227 · Accepted Answer

CLLocation 有一个 distanceFromLocation 方法，所以给定两个 CLLocation：

CLLocationDistance distanceInMeters = [location1 distanceFromLocation:location2];

或在 Swift 4 中：

//: Playground - noun: a place where people can play

import CoreLocation


let coordinate₀ = CLLocation(latitude: 5.0, longitude: 5.0)
let coordinate₁ = CLLocation(latitude: 5.0, longitude: 3.0)

let distanceInMeters = coordinate₀.distance(from: coordinate₁) // result is in meters

你到这里的距离以米为单位所以1 英里= 1609 米

if(distanceInMeters <= 1609)
 {
 // under 1 mile
 }
 else
{
 // out of 1 mile
 }

score 17 · Accepted Answer

斯威夫特 4.1

import CoreLocation

//My location
let myLocation = CLLocation(latitude: 59.244696, longitude: 17.813868)

//My buddy's location
let myBuddysLocation = CLLocation(latitude: 59.326354, longitude: 18.072310)

//Measuring my distance to my buddy's (in km)
let distance = myLocation.distance(from: myBuddysLocation) / 1000

//Display the result in km
print(String(format: "The distance to my buddy is %.01fkm", distance))

score 8 · Accepted Answer

试试这个：

distanceInMeters = fromLocation.distanceFromLocation(toLocation)
distanceInMiles = distanceInMeters/1609.344

来自苹果文档：

返回值：两个位置之间的距离（以米为单位）。

score 4 · Accepted Answer

import CoreLocation

//My location
let myLocation = CLLocation(latitude: 31.5101892, longitude: 74.3440842)

//My Next Destination
let myNextDestination = CLLocation(latitude: 33.7181584, longitude: 73.071358)

//Finding my distance to my next destination (in km)
let distance = myLocation.distance(from: myNextDestination) / 1000

score 3 · Accepted Answer

func calculateDistanceInMiles(){

    let coordinate₀ = CLLocation(latitude:34.54545, longitude:56.64646)
    let coordinate₁ = CLLocation(latitude: 28.4646, longitude:76.65464)
    let distanceInMeters = coordinate₀.distance(from: coordinate₁)
    if(distanceInMeters <= 1609)
    {
        let s =   String(format: "%.2f", distanceInMeters)
        self.fantasyDistanceLabel.text = s + " Miles"
    }
    else
    {
        let s =   String(format: "%.2f", distanceInMeters)
        self.fantasyDistanceLabel.text = s + " Miles"

    }
}

score 3 · Accepted Answer

对于迅捷4

   let locationOne = CLLocation(latitude: lat, longitude: long)
   let locationTwo = CLLocation(latitude: lat,longitude: long)

  let distance = locationOne.distance(from: locationTwo) * 0.000621371

  distanceLabel.text = "\(Int(round(distance))) mi"

score 1 · Accepted Answer

对于目标-c

您可以使用distanceFromLocation来查找两个坐标之间的距离。

代码片段：

CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:lat1 longitude:lng1];

CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:lat2 longitude:lng2];

CLLocationDistance distance = [loc1 distanceFromLocation:loc2];

您的输出将以米为单位。

score 1 · Accepted Answer

import UIKit
import CoreLocation

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        var currentLocation = CLLocation(latitude: 23.1929, longitude: 72.6156)
        var DestinationLocation = CLLocation(latitude: 23.0504, longitude: 72.4991)
        var distance = currentLocation.distance(from: DestinationLocation) / 1000
        print(String(format: "The distance to my buddy is %.01fkm", distance))
    }
}

score 1 · Accepted Answer

您也可以像使用 android 开发人员一样使用HaversineDistance 算法，这在您在 android 中有其他类似的应用程序时很有帮助，否则上面的答案对您来说是正确的。

import UIKit

func haversineDinstance(la1: Double, lo1: Double, la2: Double, lo2: Double, radius: Double = 6367444.7) -> Double {

let haversin = { (angle: Double) -> Double in
    return (1 - cos(angle))/2
}

let ahaversin = { (angle: Double) -> Double in
    return 2*asin(sqrt(angle))
}

// Converts from degrees to radians
let dToR = { (angle: Double) -> Double in
    return (angle / 360) * 2 * .pi
}

let lat1 = dToR(la1)
let lon1 = dToR(lo1)
let lat2 = dToR(la2)
let lon2 = dToR(lo2)

return radius * ahaversin(haversin(lat2 - lat1) + cos(lat1) * cos(lat2) * haversin(lon2 - lon1))
}

let amsterdam = (52.3702, 4.8952)
let newYork = (40.7128, -74.0059)

// Google says it's 5857 km so our result is only off by 2km which could be due to all kinds of things, not sure how google calculates the distance or which latitude and longitude google uses to calculate the distance.
haversineDinstance(la1: amsterdam.0, lo1: amsterdam.1, la2: newYork.0, lo2: newYork.1)

我从参考链接 https://github.com/raywenderlich/swift-algorithm-club/blob/master/HaversineDistance/HaversineDistance.playground/Contents.swift中选择了上面编写的代码

score -1 · Accepted Answer

斯威夫特 5。

func calculateDistance(mobileLocationX:Double,mobileLocationY:Double,DestinationX:Double,DestinationY:Double) -> Double {

        let coordinate₀ = CLLocation(latitude: mobileLocationX, longitude: mobileLocationY)
        let coordinate₁ = CLLocation(latitude: DestinationX, longitude:  DestinationY)

        let distanceInMeters = coordinate₀.distance(from: coordinate₁)

        return distanceInMeters
    }

用来

let distance = calculateDistance("add parameters")

ios - 如何找出坐标之间的距离？

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