MapView不会要求位置权限

Question

我试图在Swift中构建一个mapView。它已经有效但在我改变了一些我无法记住的东西之后，我现在收到了以下错误：

Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.

NSLocationAlwaysUsageDescription位于我的.plist文件中。

以下是代码：

import UIKit
import MapKit

class AwesomeMap : UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
    var map: MKMapView?
    var manager: CLLocationManager?

    func setup() {

        manager = CLLocationManager()
        manager!.delegate = self

        map!.delegate = self // map is being set from another controller

        manager!.requestAlwaysAuthorization()
        manager!.startUpdatingLocation()
    }

    func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
        println("permisison did change")
        if(status == CLAuthorizationStatus.AuthorizedWhenInUse || status == CLAuthorizationStatus.Authorized) {
          map!.showsUserLocation = true
        }
    }

    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
        for location in (locations as Array) {
            var loc = (location as CLLocation)
            println(loc.coordinate.latitude)

            let region = MKCoordinateRegion(center: loc.coordinate, span: MKCoordinateSpanMake(0.05, 0.05))
            map!.setRegion(region, animated: true)
        }
    }

    func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
        println("fail")
    }

}

在实施一些建议之前的旧代码：

import UIKit
import MapKit

class AwesomeMap : UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
var manager = CLLocationManager()
var map: MKMapView?

func setup(mapView: MKMapView) { // passing the IBOutlet from another controller

    // the change I made was around the following six lines I think...

    map = mapView
    map!.delegate = self

    manager.delegate = self
    manager.requestAlwaysAuthorization()

    map!.showsUserLocation = true
    manager.startUpdatingLocation()
}

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
    for location in (locations as Array) {
        var loc = (location as CLLocation)
        println(loc.coordinate.latitude)

        let region = MKCoordinateRegion(center: loc.coordinate, span: MKCoordinateSpanMake(0.05, 0.05))
        map!.setRegion(region, animated: true)
    }
}

func locationManager(manager: CLLocationManager!, didFailWithError error: NSError!) {
    println("fail") // nothing happens here
}

}

Answer 1

您只能拨打电话

map!.showsUserLocation = true

在您的位置管理器获得使用用户位置的权限后

。

喜欢（没有快速版本，但你可能会明白这一点）

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
     if(status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusAuthorizedAlways)
    {
        self.mapView.showsUserLocation = YES;
    }
}

Answer 2

当授权状态未确定时，请勿调用showsUserLocation。

func setup(mapView: MKMapView) { // passing the IBOutlet from another controller

    map = mapView
    map!.delegate = self

    manager.delegate = self
    manager.requestAlwaysAuthorization() // Does not if status is determined.

    self.locationManager(manager: manager, status: CLLocationManager.authorizationStatus())
}

func locationManager(manager: CLLocationManager!, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    if status == .Authorized {
        map!.showsUserLocation = true
        manager.startUpdatingLocation()
    }
}

Answer 3

转到模拟器设置

之后进入位置服务并打开。如果您需要MapView中的位置蓝色dote，请输入＆lt;＆gt;并设置＆lt;＆lt;使用应用程序时＆gt;＆gt;

Answer 4

我在我的应用程序中有这个工作代码（简化）：

if CLLocationManager.authorizationStatus() == CLAuthorizationStatus.Authorized {
    manager.startUpdatingLocation()
}

此外，您可以对任何用户的授权状态更改做出反应：

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