从当前位置添加注释

我想点击一个按钮，从用户位置添加注释。 我猜它接近工作，但是当我点击按钮时，它会在非洲的某个地方添加注释。 （纬度：0，经度：0）。 为什么不显示正确的用户位置？

导入UIKit导入MapKit导入CoreLocation

class ViewController：UIViewController，CLLocationManagerDelegate {

@IBOutlet weak var mapView: MKMapView! var locationManager = CLLocationManager() override func viewDidLoad() { super.viewDidLoad() locationManager.delegate = self locationManager.desiredAccuracy = kCLLocationAccuracyBest locationManager.requestAlwaysAuthorization() locationManager.startUpdatingLocation() } @IBAction func addAnnotation(sender: UIBarButtonItem) { let addPin = MKPointAnnotation() addPin.coordinate = CLLocationCoordinate2D(latitude: self.mapView.userLocation.coordinate.latitude, longitude: self.mapView.userLocation.coordinate.longitude) addPin.title = "Hello world" mapView.addAnnotation(addPin) } 

}

Answer 1

您遇到的问题是您没有获得用户的位置。 您需要在代码中添加一些内容才能实现此目的。 我添加了整个代码，检查注释以获取描述。

 import CoreLocation import MapKit import UIKit class ViewController: UIViewController, CLLocationManagerDelegate { @IBOutlet var mapView: MKMapView! var locationManager = CLLocationManager() // Add two variables to store lat and long var lat = 0.0 var long = 0.0 override func viewDidLoad() { super.viewDidLoad() // Check if you have the right to get the location self.locationManager.requestWhenInUseAuthorization() if CLLocationManager.locationServicesEnabled() { locationManager.delegate = self locationManager.desiredAccuracy = kCLLocationAccuracyBest } } override func viewWillAppear(animated: Bool) { // Start get the location on viewWillAppear locationManager.startUpdatingLocation() } @IBAction func addAnnoation(sender: AnyObject) { locationManager.startUpdatingLocation() let annotation = MKPointAnnotation() // Set the annotation by the lat and long variables annotation.coordinate = CLLocationCoordinate2D(latitude: lat, longitude: long) annotation.title = "User location" self.mapView.addAnnotation(annotation) } // To get the location for the user func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { let location:CLLocationCoordinate2D = manager.location!.coordinate lat = location.latitude long = location.longitude } func locationManager(manager: CLLocationManager, didFailWithError error: NSError) { print("Error") } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } 

您还需要打开info.plist文件并添加此属性： NSLocationWhenInUseUsageDescription并添加一个字符串，以便您获取用户位置（这是必需的，否则您将无法获取用户位置）。