Swift 如何在我的应用程序的其他位置使用 locationManager 函数的经度和纬度值

Question

我正在使用 CoreLocation 框架在用户打开我的应用程序时获取他们的位置。我使用这个功能：

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    var locValue:CLLocationCoordinate2D = manager.location!.coordinate


    print("locations = \(locValue.latitude) \(locValue.longitude)")

}

获取用户的经纬度位置，我可以通过将它们打印到日志中来查看它们。这很好用。

在我的应用程序的其他地方（但在同一个 viewController.swift 文件中）我有使用 OpenWeatherMap API 的代码，并且我有一个包含 url 的字符串，其中 return JSON。

在我的 viewDidLoad 中，我使用：

getWeatherData("http://api.openweathermap.org/data/2.5/weather?lat=XXXXXX&lon=XXXXXX&appid=(MY-APP-ID)")

我需要将我在 locationManager 函数中获取的 Long 和 Lat 值放入这个字符串中，我知道我可以通过 url 中的 "\()" 来完成] 字符串。

我的问题是，我目前只能在 locationManager 函数中使用这些值。如何将它们存储在此函数之外的值中，以便将它们添加到我的 URL 字符串中？

谢谢

Answer 1

希望这能回答您的问题。

import UIKit
import MapKit

class myClass {

    var userLocation: CLLocationCoordinate2D? // The user location as an Optional stored as a var in class "myClass". 
    // !!! This can be accessed everywhere within the class "myClass" (and deeper)

    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let locValue:CLLocationCoordinate2D = manager.location!.coordinate // Change it from var to let since it's only read not writen
        // !!! This can be accessed everywhere within the func "locationManager" (and deeper)

        userLocation = locValue // !!! Store it if necessary

        // Why would you call this in viewDidLoad? I doubt the user location will be available at this point (but it might). You can move this anywhere if you want
        // note the "\(name)" this will turn the var name into a string
        // if != nil not necessary here since it cannot be nil but still added it regardless
        // Maybe you want to add a check so this only gets called on the first location update. It depends on what you need it for.
        if userLocation != nil {
            getWeatherData("http://api.openweathermap.org/data/2.5/weather?lat=\(userLocation!.latitude)&lon=\(userLocation!.latitude)&appid=(MY-APP-ID)") // Why would you call this in viewDidLoad? I doubt user doubt the user location will be available at this point (but it might)
        }
        else {
            print("Error: User not Located (yet)")
        }
    }
}

Swift 如何在我的应用程序的其他位置使用 locationManager 函数的经度和纬度值

How to use Longitude and Latitude values from locationManager function elsewhere in my app in Swift

core-location

ios

swift

openweathermap