Xcode 6.3.2 - 无法通过 MapKit 获取位置

Question

我正在将应用从 Xcode 6.2 重建到 6.3.2

在我的 info.plist 中，我使用字符串消息设置 NSLocationWhenInUseUsageDescription，并使用另一个字符串消息设置 Privacy - Location Usage Description。

我打开了功能/地图 我打开了功能/背景模式/位置更新

在构建阶段导入 MapKit 和 CoreLocation 框架

我需要获取单个纬度和经度，因为 Parse 需要它们。

Imas145 回答后更新

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    var locationManager = CLLocationManager()

    @IBOutlet weak var mapView: MKMapView!

    @IBOutlet weak var anotationsCountLabel: UILabel!
    @IBOutlet weak var distanceFilterLabel: UILabel!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()

        locationManager.distanceFilter = 100.0      //tot horizontal meters before sending an update on location
        mapView.userTrackingMode = .Follow
        locationManager.startUpdatingLocation()


    }

    //MARK: - Helper - CLLocationManagerDelegate

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

        if let location = locationManager.location {

        var myLatitude = locationManager.location.coordinate.latitude
        var myLongitude = locationManager.location.coordinate.longitude

        var location = CLLocationCoordinate2D(latitude: myLatitude, longitude: myLongitude)
        let span = MKCoordinateSpanMake(0.05, 0.05)             //how much to show
        let region = MKCoordinateRegionMake(location, span)     //how much to show
        mapView.setRegion(region, animated: true)

//        let anotation = MKPointAnnotation()
//        anotation.coordinate = location                         //was : anotation.setCoordinate(location)
//        anotation.title = "you are here"
//        anotation.subtitle = "City name"


//        mapView.removeAnnotation(anotation)
//        mapView.addAnnotation(anotation)


        var totalAnotations = mapView.annotations.count
        anotationsCountLabel.text = "\(totalAnotations)"
        distanceFilterLabel.text = "\(locationManager.distanceFilter)"
        println("latitude is: \(myLatitude)")
        println("longitude is: \(myLongitude)")


//        locationManager.stopUpdatingLocation()

        }

    }



    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        println("problem1: error" + error.localizedDescription)

    }



}

Answer 1

在您使用startUpdatingLocation() 开始位置更新后，您无法立即访问location。正如文档所说：

The last location received. Will be nil until a location has been received.

因此，您需要在确定位置后进行处理。你可以在locationManager:didUpdateLocations:

这是一个快速的实现：

    class ViewController: UIViewController, CLLocationManagerDelegate {

    @IBOutlet weak var mapView: MKMapView!


    var locationManager = CLLocationManager()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.



        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.distanceFilter = 100.0      //distance before notifing a change
        locationManager.startUpdatingLocation()     //really starts monitoring position

        // move the code to delegate method

    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        if let location = locationManager.location {
            var myLatitutde = location.coordinate.latitude
            var myLongitude = location.coordinate.longitude

            var myLocation = CLLocationCoordinate2D()
            let span = MKCoordinateSpanMake(0.05, 0.05)                 //how much to show
            let region = MKCoordinateRegionMake(myLocation, span)       //how much to show
            mapView.setRegion(region, animated: true)

            let anotation = MKPointAnnotation()

            anotation.coordinate = myLocation                       //XC 6.3.2
            anotation.title = "you are here"
            anotation.subtitle = "city name"

            mapView.addAnnotation(anotation)
        }

    }
}

您还应该处理locationManager:didFailWithError:，以防出现问题。

编辑：

要使大头针下落动画，您需要执行以下操作：

1. 将MKMapViewDelegate 协议添加到您的班级

   class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate
   

2. 将代理添加到您的mapView

   override func viewDidLoad() {
       super.viewDidLoad()
       // Do any additional setup after loading the view, typically from a nib.
   
       mapView.delegate = self
   
       // rest of the code, location manager setup etc...
   }
   

3. 实现mapView:viewForAnnotation:委托方法

   func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
       let pin = MKPinAnnotationView(annotation: annotation, reuseIdentifier: nil)
       pin.pinColor = .Red // or .Green or .Purple
       pin.animatesDrop = true
       pin.canShowCallout = true
       return pin
   }
   

现在大头针掉落动画了。