我需要帮助创建一个按钮，用于保存用户当前位置，如果他们移动，则需要多个其他位置，以便我可以通过CSV文件导出这些位置

Posted 2021-04-09

所以我在将当前位置的经度和纬度从我的locationManager函数传递到我的按钮函数时遇到了一些麻烦。我喜欢将用户坐标存储在变量中的按钮，然后将该变量传递给我的任务类，以便我可以通过电子邮件将其作为.csv文件导出。然后该文件将上传到我正在创建的地图上工作。这是我的代码：

//
// ViewController.swift
// project
//
// Created by Tyler Struntz on 6/22/18.
// Copyright © 2018 Tyler Struntz. All rights reserved.
//
import UIKit
import MapKit
import CoreLocation
import MessageUI
class ViewController: UIViewController,CLLocationManagerDelegate
{
@IBAction func saveLocation(_ sender: Any)
{
}
@IBOutlet weak var map: MKMapView!
let locationManager = CLLocationManager()
//creating CSV file
var taskArr = [Task]()
var task: Task!
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations[0]
let span:MKCoordinateSpan = MKCoordinateSpanMake(0.0001, 0.0001)
let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
let _:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)
self.map.showsUserLocation = true
let latCord = location.coordinate.latitude
let lonCord = location.coordinate.longitude
// print("--------------------\n")
// print("\(location.coordinate.latitude)")
// print("--------------------\n")
}
override func viewDidLoad()
{
super.viewDidLoad()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
////////////////////////////////////////
task = Task()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
}
}
class Task: NSObject
{
var name: String = ""
var latitude = Float("")
var longitude = Float("")
}

非常感谢您的帮助！！

答案

为什么不将myLocation定义为可选的var，例如

var myLocation:CLLocationCoordinate2D?

然后在didUpdateLocations函数中，你可以初始化它

myLocation = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)   

在按钮单击内，您有以下代码：

if let location=myLocation {
   /* Code for saving the coordinates to CSV. Make sure to use location (or myLocation!) */
}