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我是Xcode和Swift的新手,我試圖製作一張地圖,顯示用戶當前的位置並更新它。我有這個至今:MKMapView似乎是零?
import UIKit
import MapKit
import CoreLocation
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
@IBOutlet weak var map: MKMapView!
let locationManager = CLLocationManager()
var mapp = MKMapView.self
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if (CLLocationManager.locationServicesEnabled())
{
self.locationManager.delegate = self
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.startUpdatingLocation()
self.map.showsUserLocation = true
}
else
{
print("Location services are not enabled")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func loadView() {
//let camera = GMSCameraPosition.camera(withLatitude: 36.2108, longitude: -81.6774, zoom: 15.0)
//let mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
//mapView.isMyLocationEnabled = true
//view = mapView
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
let location = locations.last
let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: location!.coordinate.longitude)
let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.002, longitudeDelta: 0.002))
self.map.setRegion(region, animated: true)
self.locationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error)
{
print("Errors: " + error.localizedDescription)
}
}
我曾在故事板一個MapView和CTRL其拖動到文件(因此@IBOutlet弱VAR圖:的MKMapView)。但是,當我插入手機並模擬應用程序時,它給了我一個「意外發現的零,同時解開可選值」,並且在某些打印語句後,我發現每當引用地圖變量時都會發生這種情況。爲什麼是這樣?謝謝!
你檢查你的應用程序的功能選項卡?地圖應該在那裏(默認關閉)。 – lithium
刪除'loadView'方法。僅當您以編程方式創建視圖時才使用它。在使用故事板(或NIB)時,您將配置代碼放在'viewDidLoad'中,而不是'loadView'。 – Rob
@Rob是對的。刪除'loadView',它應該工作。 –