xcode - MKMapView 不被称为 Swift ios 8

Question

嗨，我只是想知道为什么我的 MapView 函数没有被调用。我试图在点之间画一条线，但所有显示的只是中心位置。提前致谢。 导入 UIKit导入核心位置导入MapKit

类 ThirdViewController: UIViewController , CLLocationManagerDelegate {

@IBOutlet weak var theMap: MKMapView!

@IBOutlet weak var theLabel: UILabel!

    var manager:CLLocationManager!
    var myLocations: [CLLocation] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        //Setup our Location Manager
        manager = CLLocationManager()
        self.manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.requestAlwaysAuthorization()
        manager.startUpdatingLocation()


        //Setup our Map View
       // theMap.delegate = self
        theMap.mapType = MKMapType.Standard
        theMap.showsUserLocation = true
    }


    func locationManager(manager:CLLocationManager, didUpdateLocations locations:[AnyObject]) {
        theLabel.text = "\(locations[0])"
        myLocations.append(locations[0] as CLLocation)

        let spanX = 0.007
        let spanY = 0.007
        var newRegion = MKCoordinateRegion(center: theMap.userLocation.coordinate, span: MKCoordinateSpanMake(spanX, spanY))
        theMap.setRegion(newRegion, animated: true)
        println("not yet ")
        if (myLocations.count > 1){
            println("here ")
            var sourceIndex = myLocations.count - 1
            var destinationIndex = myLocations.count - 2
            let c1 = myLocations[sourceIndex].coordinate
            let c2 = myLocations[destinationIndex].coordinate
            var a = [c1, c2]
            var polyline = MKPolyline(coordinates: &a, count: a.count)
            theMap.addOverlay(polyline)
        }
}
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
    println("sad")
    if overlay is MKPolyline {
        println("aadsfsad")
        var polylineRenderer = MKPolylineRenderer(overlay: overlay)
        polylineRenderer.strokeColor = UIColor.blueColor()
        polylineRenderer.lineWidth = 4
        return polylineRenderer
    }
    return nil
}

}

Answer 1

在 ios8+ 中，MapView 没有自动加载位置坐标。如果我们想使用 MKMapView 通过“mapView:didUpdateUserLocation”加载更准确的位置:

前提:
1.设置mapView委托(delegate)。
2.setShowsUserLocation:YES
3.mapView必须在容器中(addSubview:mapView)!!!!!!

例如:

self.mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
_mapView.delegate = self;
[_mapView setShowsUserLocation:YES];
[[UIApplication sharedApplication].keyWindow addSubview:_mapView];