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当前位置未在iOS模拟器中显示

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我'm trying to show the user'在MKMapView中的当前位置， mapView . 我请求许可，我相信我的所有基础都已涵盖，但由于某种原因，当前位置不会显示在 Map 上 .

下面是代码 . 不介意段控件，我只是使用它们来更改 Map 类型 .

import UIKit
import MapKit

let annotationId = "annotationID";

class ViewController: UIViewController, CLLocationManagerDelegate {

@IBOutlet weak var mapView: MKMapView!
@IBOutlet weak var segControls: UISegmentedControl!

let locationManager = CLLocationManager();
var zoomToUserLocation = false;

// Switch statements for the seg controls.

@IBAction func mapType(sender: UISegmentedControl) {
    switch segControls.selectedSegmentIndex {
    case 0:
        mapView.mapType = MKMapType.Standard
    case 1:
        mapView.mapType = MKMapType.Satellite
    case 2:
        mapView.mapType = MKMapType.Hybrid
    default:
        mapView.mapType = MKMapType.Standard 
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    // We are setting the delegate equal to self here to be able to use the indentifier that deques the annotations.
    locationManager.delegate = self

    // Status of user is variable that speaks directly to (in this case) authorization status
    let status = CLLocationManager.authorizationStatus()

    if status == CLAuthorizationStatus.NotDetermined {
        locationManager.requestWhenInUseAuthorization()
    } else if  status != .Denied {
        locationManager.startUpdatingLocation()
    }

    // let annotation = MKPointAnnotation();
}

// If the status changes to authorize when in use or always authorize
// then start updating the location, if not don't do anything.

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    if status == CLAuthorizationStatus.AuthorizedWhenInUse || status == CLAuthorizationStatus.AuthorizedAlways {
        locationManager.startUpdatingLocation()
    }
}

// If the location failed when trying to get users location execute this function
func  locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println("Error: \(error)")
    }
}

extension ViewController: MKMapViewDelegate {
    func mapView(mapView: MKMapView!, didUpdateUserLocation userLocation: MKUserLocation!) {

    let coordinate = userLocation.coordinate; // this sets the var coordinates to the location of the user.

    println("User Location = (\(coordinate.latitude), \(coordinate.longitude))");

    if zoomToUserLocation == true {
        let locationOfDevice: CLLocation = userLocation.location // this determines the location of the device using the users location

        let deviceCoordinate: CLLocationCoordinate2D = locationOfDevice.coordinate // determines the coordinates of the device using the location device variabel which has in it the user location.

        let span = MKCoordinateSpan(latitudeDelta: 1, longitudeDelta: 1) // this determines the span in which its determined that 1 degree is 69 miles.

        let region = MKCoordinateRegion(center: deviceCoordinate, span: span) // set the center equal to the device coordinates and the span equal to the span variable we have created this will give you the region.

        mapView.setRegion(region, animated: true);
    } 
}
}
ios swift location mkmapview

2 回答

  • 0

    您需要将MKMapView的 showsUserLocation 属性设置为 true . 它是一个布尔属性，将显示当前位置（您引用的脉冲蓝点 - 可以着色并且不总是蓝色） .

    以下是Apple如何在他们的documentation中总结

    此属性不指示用户的位置是否在 Map 上实际可见，仅指示 Map 视图是否应尝试显示它 . 将此属性设置为true会导致 Map 视图使用Core Location框架查找当前位置并尝试在 Map 上显示它 . 只要此属性为true， Map 视图就会继续跟踪用户的位置并定期更新 . 此属性的默认值为false . 显示用户的位置并不能保证该位置在 Map 上可见 . 用户可能已将 Map 滚动到不同的点，导致当前位置在屏幕外 . 要确定用户当前位置当前是否显示在 Map 上，请使用userLocationVisible属性 .

    所以在你的 viewDidLoad 函数中，你应该设置这个属性：

    mapView.showsUserLocation = true

    zoomToUserLocation 属性不控制当前位置点 .

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  • 3

    有时您需要首先设置自定义位置以使模拟器更新并实际设置位置（不知道为什么） . 我做的是去 Debug->Location->Apple 只是为了检查 Map 位置的东西是否真的有效 . 然后我设置了一个自定义位置，其中包含我从谷歌 Map 或类似地方找到的坐标 .

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