如何在swift的地图视图上显示位置？我相信我的代码是最新的，但模拟器没有显示位置或蓝点？
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【中文标题】如何在swift的地图视图上显示位置？我相信我的代码是最新的，但模拟器没有显示位置或蓝点？【英文标题】：How to show location on map view on swift? I believe my code is current but simulator doesn't show location or the blue dot? 【发布时间】：2019-04-24 05:54:21 【问题描述】：我正在尝试使用 swift 上的地图视图在我的当前位置和地图上显示一个蓝点。但是它没有显示我的位置，也没有显示蓝点我对我的代码非常肯定，但我无法让它显示！应该是设置的问题吧？
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController
@IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
let regionInMeters: Double = 1000
override func viewDidLoad()
super.viewDidLoad()
checkLocationServices()
func setupLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
func centerViewOnUserLocation()
if let location = locationManager.location?.coordinate
let region = MKCoordinateRegion.init(center: location, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
mapView.setRegion(region, animated: true)
func checkLocationServices()
if CLLocationManager.locationServicesEnabled()
setupLocationManager()
checkLocationAuthorrization()
else
// Show alert letting the user know they have to turn this on.
func checkLocationAuthorrization()
switch CLLocationManager.authorizationStatus()
case .authorizedWhenInUse:
mapView.showsUserLocation = true
centerViewOnUserLocation()
locationManager.startUpdatingLocation()
break
case .denied:
// Show alret instructing them how to turn on permissions
break
case .notDetermined:
break
case .restricted:
// Show alret letting them know what's up
break
case .authorizedAlways:
break
extension ViewController: CLLocationManagerDelegate
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
guard let location = locations.last else return
let center = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
let region = MKCoordinateRegion.init(center: center, latitudinalMeters: regionInMeters, longitudinalMeters: regionInMeters)
mapView.setRegion(region, animated: true)
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus)
checkLocationAuthorrization()
【问题讨论】：
从菜单中选择调试 -> 位置 -> 自定义位置，然后输入您的坐标 在 setupLocationManager 方法中添加 locationManager.requestWhenInUseAuthorization() 首先为您的地图设置 self.mapView.showsUserLocation = true 并在启动应用程序后调试 -> 位置 -> 输入自定义位置或从列表中选择一个 我在添加后收到此错误消息 [11334:14070810] 致命错误：在隐式展开可选值时意外发现 nil 添加异常断点并检查它在哪里崩溃 【参考方案1】：您必须在Info.plist 文件中添加以下权限
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Usage Description</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Usage Description</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Usage Description</string>
导入库：
import MapKit
import CoreLocation
设置委托：
CLLocationManagerDelegate,MKMapViewDelegate
添加变量：
private var locationManager: CLLocationManager!
private var currentLocation: CLLocation?
在viewDidLoad()上写下代码：
mapView.delegate = self
mapView.showsUserLocation = true
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
// Check for Location Services
if CLLocationManager.locationServicesEnabled()
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
为位置编写委托方法：
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
defer currentLocation = locations.last
if currentLocation == nil
// Zoom to user location
if let userLocation = locations.last
let viewRegion = MKCoordinateRegion(center: userLocation.coordinate, latitudinalMeters: 2000, longitudinalMeters: 2000)
mapView.setRegion(viewRegion, animated: false)
就是这样，现在您可以看到您当前的位置和蓝点了。
【讨论】：
【参考方案2】：要在地图上显示用户位置，请执行以下步骤：
试试这条路- 转到产品->编辑方案->选项->选择允许位置模拟并选择默认位置。 在这里您还可以使用 GPX 文件添加自定义位置。 设置干净后运行应用程序。
【讨论】：
不幸的是仍然没有蓝点或我的位置【参考方案3】：问题似乎出在方法checkLocationAuthorrization，这里你必须在状态为notDetermined时询问locationManager.requestWhenInUseAuthorization()，像这样：
func checkLocationAuthorization(authorizationStatus: CLAuthorizationStatus? = nil)
switch (authorizationStatus ?? CLLocationManager.authorizationStatus())
case .authorizedAlways, .authorizedWhenInUse:
locationManager.startUpdatingLocation()
mapView.showsUserLocation = true
case .restricted, .denied:
// show alert instructing how to turn on permissions
print("Location Servies: Denied / Restricted")
case .notDetermined:
locationManager.requestWhenInUseAuthorization()
还要更改委托方法以传递接收到的当前状态
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus)
self.checkLocationAuthorization(authorizationStatus: status)
还要注意locationManager.requestWhenInUseAuthorization() 将不起作用，如果Info.plist 没有以下使用说明，请编辑Info.plist 文件并确保：
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Message for AlwaysAndWhenInUseUsageDescription</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Message for AlwaysUsageDescription</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Message for WhenInUseUsageDescription</string>
最后，您必须等待位置更新才能调用centerViewOnUserLocation，就像这样
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
guard let location = locations.last else return
let span = MKCoordinateSpan(latitudeDelta: 0.05, longitudeDelta: 0.05)
let region = MKCoordinateRegion(center: location.coordinate, span: span)
mapView.setRegion(region, animated: true)
【讨论】：
【参考方案4】：模拟器不显示当前位置，但您可以通过以下方式手动添加位置：
Debug -> Location -> Custom Location 然后给出坐标。
【讨论】：
我试过了，但我还是看不到蓝点，真的不工作【参考方案5】：在您的viewDidLoad 方法中，请编写以下代码。
showsUserLocation 的默认值是false. 所以，我们必须更新它的默认值。
override func viewDidLoad()
super.viewDidLoad()
self.mapView.showsUserLocation = true
checkLocationServices()
参考我更新的代码。
【讨论】：
【参考方案6】：import UIKit
import MapKit
class ViewController: UIViewController
@IBOutlet weak var mapview: MKMapView!
override func viewDidLoad()
super.viewDidLoad()
let location = CLLocationCoordinate2D(latitude: "", longitude: "")
let span = MKCoordinateSpanMake(0.5, 0.5)
let region = MKCoordinateRegion(center: location, span: span)
mapview.setRegion(region, animated: true)
let annotation = MKPointAnnotation()
annotation.coordinate = location
annotation.title = "your title"
mapview.addAnnotation(annotation)
【讨论】：
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