CLLocationDistance轉換

Question

我有距離型CLLocationDistance的變量，我需要將其轉換在整型變量我怎麼能做到這一點

我必須使用

CLLocationDistance kilometers; 

int distance = [kilometers intValue]; 

但它給錯誤。

幫助傢伙

Answer 1

https://developer.apple.com/library/mac/#documentation/CoreLocation/Reference/CLLocation_Class/CLLocation/CLLocation.html

distanceFromLocation: 

返回從接收器的位置到指定位置的距離（以米爲單位）。

- (CLLocationDistance)distanceFromLocation:(const CLLocation *)location 

參數

位置的其他位置。

返回值 兩個位置之間的距離（以米爲單位）。

返回類型是double而不是int。而且它不是NSNumber。

Answer 2

這將通過使用CLLocationDistance來計算兩個位置之間的距離。默認情況下，它以米爲單位給出值。要轉換爲公里，請將CLLocationDistance/1000.0分開。要獲得英里數乘以CLLocationDistance*0.62137。

//Pass your current location Latitude and longitude 
        CLLocation *currentlocation = [[CLLocation alloc] initWithLatitude:13.015370f longitude:80.200393f]; 
//Pass your destination location Latitude and longitude 
CLLocation *destination = [[CLLocation alloc] initWithLatitude:37.420948f longitude:-122.09578499999998f]; 
CLLocationDistance meters = [currentlocation distanceFromLocation:destination]; 
//get distance in meters 
    NSLog(@"meters :%f", meters); 
//get distance in kilometers 
    CLLocationDistance kilometers = meters/1000.0; 
    NSLog(@"kilometers :%f", kilometers); 
//Get distance in miles 
    NSLog(@"Miles:%f",kilometers*0.62137); 
//convert kilometers to int value 
    int num=kilometers; 

Answer 3

斯威夫特：

var initialLocation :CLLocation? 
    var updatedUserLocation :CLLocation? 
    var distanceBetweenLocations: CLLocationDistance? 

//MK MapView Delegate 
    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 

    updatedUserLocation = locations.last 
    distanceBetweenLocations = updatedUserLocation!.distanceFromLocation(initialLocation!) 

    //convert To Miles 
    distanceBetweenLocations = Utility.convertCLLocationDistanceToMiles(distanceBetweenLocations) 

//Setting Distance Value 
    distanceLabel.text = String(format: " Distance : %.2f ", distanceBetweenLocations!) 

    } 

注：我有類命名工具，供應整個項目的公共類的方法。這是爲了更好地實現代碼的可重用性和減少。

// Utility.swift 

import UIKit 
import Foundation 
import CoreLocation 

class Utility { 

    class func convertCLLocationDistanceToMiles (var targetDistance : CLLocationDistance?) -> CLLocationDistance { 
    targetDistance = targetDistance!*0.00062137 
    return targetDistance! 
    } 
    class func convertCLLocationDistanceToKiloMeters (var targetDistance : CLLocationDistance?) -> CLLocationDistance { 
    targetDistance = targetDistance!/1000 
    return targetDistance! 
    } 

} 

Answer 4

SWIFT 4

末到本黨，但你也可以創建一個這樣的擴展：

CLLocationDistance.swift

import UIKit 
import CoreLocation 

extension CLLocationDistance { 
    func inMiles() -> CLLocationDistance { 
     return self*0.00062137 
    } 

    func inKilometers() -> CLLocationDistance { 
     return self/1000 
    } 
} 

你可以稱它爲如下：

distance.inKilometers() 

我希望這可以幫助任何人絆倒在這！