Question

我正在开发一个简单的应用程序，它将显示一个地图和一些标记。我还希望在此应用中显示用户的当前位置。到目前为止，这是我的代码：

import UIKit
import MapKit
import CoreLocation

class HomePageViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    @IBOutlet weak var templabelforlocationtesting: UILabel!
    @IBOutlet weak var map: MKMapView!
    let locationManager = CLLocationManager()
    @IBOutlet weak var menuButton: UIBarButtonItem!

    override func viewDidLoad() {
        super.viewDidLoad()

        if self.revealViewController() != nil {
            menuButton.target = self.revealViewController()
            menuButton.action = "revealToggle:"
            self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
        }

        // Do any additional setup after loading the view.
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()
        self.map.showsUserLocation = true

        //temporary nearby locations list

        //temple tooth
        let templeToothMarker = MKPointAnnotation()
        let templeToothLocation = CLLocationCoordinate2D(latitude: 7.294715, longitude: 80.639858)
        templeToothMarker.coordinate = templeToothLocation
        templeToothMarker.title = "Kandy Dalada Maligawa"
        templeToothMarker.subtitle = "Historic Religious place"

        //botanical gardens

        let botanicalGardenMarker = MKPointAnnotation()
        let botanicalGardenLocation = CLLocationCoordinate2D(latitude: 7.273346, longitude: 80.595140)
        botanicalGardenMarker.coordinate = botanicalGardenLocation
        botanicalGardenMarker.title = "Royal Botanical Gardens"
        botanicalGardenMarker.subtitle = "Botanical Garden in Kandy"

        //load markers to map
        map.addAnnotations([templeToothMarker, botanicalGardenMarker])

    }

    func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location = locations.last! as CLLocation

        let centerLocation = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
        templabelforlocationtesting.text = "Location: " + String(location.coordinate.latitude) + " , " + String(location.coordinate.longitude)

        let mapSpan = MKCoordinateSpanMake(0.06, 0.06)

        let mapRegion = MKCoordinateRegion(center: centerLocation, span: mapSpan)

        self.map.setRegion(mapRegion, animated: true)
        self.locationManager.stopUpdatingLocation()
    }


}

地图正在运行且标记正在显示，但以下问题仍然存在。

我无法让地图缩放到更高级别（到let mapSpan = MKCoordinateSpanMake(0.06, 0.06)中设置的级别）
应获取用户的当前位置并将其设置为地图的中心，并且还应显示带有注释的当前位置。要检查位置是否已加载，我也设置了标签，但这也不起作用。

我在这里做错了什么？

Answer 1

这段代码结构总是错误的：

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    // ...
    self.locationManager.stopUpdatingLocation()
}

问题是在获得可用位置之前需要多次调用locationManager:didUpdateLocations:。但是在第一次调用之后你无条件地停止了，这几乎肯定是没用的。

另外，如果你还告诉self.map.setRegion(mapRegion, animated: true)，你永远不应该告诉地图self.map.showsUserLocation = true。如果showsUserLocation为true，地图将设置本身以显示正确的区域。实际上，如果您只想将地图设置为用户的位置，则根本不应使用位置管理器更新位置。让地图视图完成所有工作。

缩放和当前位置未在地图swift中显示

1 个答案: