swift - 高度数据类型

Question

这可能是一个很奇怪的问题，我正在尝试找出高度的数据类型，但我不确定是否应该这样调用它。但是任何建议都会非常有帮助。所以我需要帮助的代码位在这里:

var latitude:CLLocationDegrees = 0
var longitude:CLLocationDegrees = 0
var speed:CLLocationSpeed = 0
var course:CLLocationDirection = 0
var altitude:CLLocation

如您所见，var altitude:CLLocation 没有完全声明，因为我不确定它的数据类型。我应该写些什么来完成这份声明？只是为了给你一些上下文，这里是完整的代码(我认为没有必要阅读所有代码，但它就在这里):

//
//  ViewController.swift
//  Map Demo My Try
//
//  Created by Jae Hyun Kim on 8/14/15.
//  Copyright © 2015 Jae Hyun Kim. All rights reserved.
//

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    var locationManager = CLLocationManager()

    var latitude:CLLocationDegrees = 0
    var longitude:CLLocationDegrees = 0
    var speed:CLLocationSpeed = 0
    var course:CLLocationDirection = 0
    var altitude:CLLocation

    @IBOutlet weak var longitudeLabel: UILabel!
    @IBOutlet weak var latitudeLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        print(locations)
        let userLocations: CLLocation = locations[0]
        latitude = userLocations.coordinate.latitude
        longitude = userLocations.coordinate.longitude
        let speed = userLocations.speed
    }




    @IBAction func getInformation(sender: AnyObject) {
        longitudeLabel.text = String(latitude)
        latitudeLabel.text = String(longitude)

    }
}

如有任何帮助，我们将不胜感激!

Answer 1

高度的类型是 CLLocationDistance(如 CLLocation Reference 中所述)CLLocationDistance 是 Double 的类型别名。