我正在尝试将MKOverlay(我的MKRoute)添加到我的MapView中,但我无法弄清楚我做错了什么。这非常草率,因为我在我的应用程序中实现它之前我正在尝试它。
以下是代码:
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
@IBOutlet var map: MKMapView!
var geocoder:CLGeocoder = CLGeocoder()
var location:CLLocation = CLLocation(latitude: 38, longitude: -77)
var next:CLLocation = CLLocation(latitude: 38.9, longitude: -77.61)
var locMark:MKPlacemark?
var destMark:MKPlacemark?
var manager:CLLocationManager = CLLocationManager()
var source:MKMapItem?
var destination:MKMapItem?
var request:MKDirectionsRequest = MKDirectionsRequest()
var directions:MKDirections = MKDirections()
var directionsResponse:MKDirectionsResponse = MKDirectionsResponse()
var route:MKRoute! = MKRoute()
override func viewDidLoad() {
super.viewDidLoad()
self.map.delegate = self
manager.requestAlwaysAuthorization()
let latDelt = 0.05
let lonDelt = 0.05
let span:MKCoordinateSpan = MKCoordinateSpan(latitudeDelta: latDelt, longitudeDelta: lonDelt)
let region:MKCoordinateRegion = MKCoordinateRegion(center: CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude), span: span)
map.setRegion(region, animated: true)
map.mapType = MKMapType.Satellite
locMark = MKPlacemark(coordinate: CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude), addressDictionary: nil)
destMark = MKPlacemark(coordinate: CLLocationCoordinate2DMake(next.coordinate.latitude, next.coordinate.longitude), addressDictionary: nil)
source = MKMapItem(placemark: locMark)
destination = MKMapItem(placemark: destMark)
request.setSource(source)
request.setDestination(destination)
request.transportType = MKDirectionsTransportType.Automobile
request.requestsAlternateRoutes = true
let directions = MKDirections(request: request)
directions.calculateDirectionsWithCompletionHandler { (response:MKDirectionsResponse?, error:NSError?) -> Void in
if error == nil {
self.directionsResponse = response!
self.route = self.directionsResponse.routes[0] as! MKRoute
self.map.addOverlay(self.route.polyline)
} else {
println(error)
}
}
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
if overlay is MKPolyline {
var pr = MKPolylineRenderer(overlay: overlay)
pr.strokeColor = UIColor.purpleColor()
pr.lineWidth = 5
return pr
}
return nil
}
}
我没有打印任何错误,但根本没有路线显示在地图上。
答案 0 :(得分:2)
问题是rendererForOverlay
内的viewDidLoad
函数嵌套:
override func viewDidLoad() {
//your viewDidLoad code is here...
//rendererForOverlay is declared here inside viewDidLoad...
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
...
}
} // <-- closing brace of viewDidLoad
因此,rendererForOverlay
功能在地图视图中隐藏,并且不会调用它,导致不显示叠加效果。
要解决此问题,请将rendererForOverlay
功能移到viewDidLoad
之外,以便其他人可以看到它:
override func viewDidLoad() {
//your viewDidLoad code is here...
} // <-- closing brace of viewDidLoad
//put rendererForOverlay here outside viewDidLoad...
func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
...
}