Question

当我运行代码时，窗口会弹出，要求获得使用位置的权限，但几乎立即消失，而不是让用户有机会点击“允许”。有没有办法在继续之前强制执行此操作？

import UIKit
import MapKit
import CoreLocation

class MapViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate{

var map:MKMapView?
var manager:CLLocationManager!

convenience init(frame:CGRect){
    self.init(nibName: nil, bundle: nil)
    self.view.frame = frame

    self.map = MKMapView(frame: frame)
    self.map!.delegate = self

    self.view.addSubview(self.map!)

}

override func viewDidLoad() {
    super.viewDidLoad()

    // Core Location
    manager = CLLocationManager()
    manager.delegate = self
    manager.desiredAccuracy = kCLLocationAccuracyBest

}

func locationManager(manager: CLLocationManager!,
    didChangeAuthorizationStatus status: CLAuthorizationStatus){

        print("The authorization status of location services is changed to: ")

        switch CLLocationManager.authorizationStatus(){
        case .Denied:
            println("Denied")
        case .NotDetermined:
            println("Not determined")
        case .Restricted:
            println("Restricted")
        default:
            println("Authorized")
        }

}

func displayAlertWithTitle(title: String, message: String){
    let controller = UIAlertController(title: title,
        message: message,
        preferredStyle: .Alert)

    controller.addAction(UIAlertAction(title: "OK",
        style: .Default,
        handler: nil))

    presentViewController(controller, animated: true, completion: nil)

}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    if CLLocationManager.locationServicesEnabled(){
        switch CLLocationManager.authorizationStatus(){
        case .Denied:
            displayAlertWithTitle("Not Determined",
                message: "Location services are not allowed for this app")
        case .NotDetermined:
                manager.requestWhenInUseAuthorization()
                manager.startUpdatingLocation()
        case .Restricted:
            displayAlertWithTitle("Restricted",
                message: "Location services are not allowed for this app")
        default:
            println("Default")
        }

    } else {
        println("Location services are not enabled")
    }

}


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

    var userLocation:CLLocation = locations[0] as! CLLocation
    var latitude:CLLocationDegrees = userLocation.coordinate.latitude
    var longitude:CLLocationDegrees = userLocation.coordinate.longitude
    var latDelta:CLLocationDegrees = 1.0
    var lonDelta:CLLocationDegrees = 1.0

    var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, lonDelta)
    var location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    var region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)
    map!.setRegion(region, animated: true)
    manager.stopUpdatingLocation()

}

Answer 1

这是因为您在从manager.startUpdatingLocation()获得结果之前正在调用manager.requestWhenInUseAuthorization()。即使你打电话给requestWhenInUseAuthorization，你也会在获得该方法的结果之前更新用户的位置（实际上，我确实有same question！）

该问题的答案很好地解释了解决方案。基本上，您需要实现locationManager:didChangeAuthorizationStatus委托方法，该方法在授权状态根据用户输入更改时调用。如果用户授权进行跟踪，则可以拨打manager.startUpdatingLocation()。

另外，对于如何实现这些方法的Swift示例，请查看此guide。

Answer 2

请试试这个：

select id,NearestTo(TempPoint.geo_point,Points) from TempPoints;

成功。

NSLocation不等我点击允许

2 个答案: