如何使用 Mapkit (Swift) 去用户位置

Posted 2023-03-05

【中文标题】如何使用 Mapkit (Swift) 去用户位置

【英文标题】：How to go to user location with Mapkit (Swift)

【发布时间】：2015-07-11 19:24:29

【问题描述】：

我是应用程序开发的新手，我一直在尝试创建一个应用程序，该应用程序将使用核心位置管理器来查找用户位置，然后使用 mapkit 显示它。下面是我想出的代码。我一直无法修复它，有谁知道我做错了什么？谢谢。

//
//  ViewController.swift
//  MapKit Test
//
//  Created by TMT on 7/11/15.
//  Copyright (c) 2015 TMT Inc. All rights reserved.
//

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate 

@IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() 
    super.viewDidLoad()
    mapView.showsUserLocation = true
    mapView.showsPointsOfInterest = true
    mapView.delegate = self

  let locationManager = CLLocationManager()

  // Ask for Authorisation from the User.
  locationManager.requestAlwaysAuthorization()

  // For use in foreground
  locationManager.requestWhenInUseAuthorization()

  if CLLocationManager.locationServicesEnabled() 
     locationManager.delegate = self
     locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
     locationManager.startUpdatingLocation()
  

  @NSCopying var location: CLLocation!  get 


  var span = MKCoordinateSpanMake(0.2
     , 0.2)

  var region = MKCoordinateRegion(center: location, span: span)

  mapView.setRegion(region, animated: true)


  var request = MKLocalSearchRequest()
  request.naturalLanguageQuery = "library"


            // Do any additional setup after loading the view, typically from a nib.


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

【问题讨论】：

查看此示例github.com/talhaqamar/Map-demo-swift

谢谢约翰尼，这对我帮助很大。

【参考方案1】：

您没有处理位置/地图的委托方法。您的代码正在设置地图和位置框架以及委托方法。你已经初始化了它们并告诉编译器你想用 mapkit/corelocation 做一些事情。所以现在你需要处理你包含的委托方法MKMapViewDelegate, CLLocationManagerDelegate，并设置为self

将委托处理和代码放在某处

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) 

    //Get map location
    let location = locations.last as! CLLocation
    let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
    let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta: 0.01))
    self.mapView.setRegion(region, animated: true)

    //Get co ordinates
    CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: (placemarks, error)->Void in

        if (error != nil) 
            println("Error: " + error.localizedDescription)
            return
        

        if placemarks.count > 0 
            let pm = placemarks[0] as! CLPlacemark
            self.displayLocationInfo(pm)
         else 
            println("Error with the data.")
        
    )

func displayLocationInfo(placemark: CLPlacemark) 

//Remove observer
self.locationManager.stopUpdatingLocation()

println(placemark.locality)
println(placemark.postalCode)
println(placemark.administrativeArea)
println(placemark.country)



func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) 
    println("Error: " + error.localizedDescription)

【讨论】：

我需要把这个放在哪里？我尝试将它粘贴到我的代码中，但我得到了一堆错误。