我试图向用户显示其在地图上的当前位置,但没有什么工作。我要去哪里错了?
import UIKit
import CoreLocation
import MapKit
class MapViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate {
var window: UIWindow?
var mapView: MKMapView?
let locationManager = CLLocationManager()
let distanceSpan: Double = 500
override func viewDidLoad() {
super.viewDidLoad()
setupNavBar()
setupMapView()
setupLocationManager()
}
fileprivate func setupNavBar() {
self.navigationItem.title = "Near By"
self.navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Back", style: .done, target: self, action: #selector(handleDissmiss))
}
fileprivate func setupLocationManager() {self.locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
}
}
fileprivate func setupMapView() {
self.window = UIWindow(frame: UIScreen.main.bounds)
self.view.backgroundColor = UIColor.white
self.mapView?.showsUserLocation = true
self.mapView = MKMapView(frame: CGRect(x: 0, y: 20, width: (self.window?.frame.width)!, height: view.frame.height))
self.view.addSubview(self.mapView!)
}
分配好自己的MapView之前,务必设置showUserLocation
财产。
今后,为了避免这种错误,你可以使用不同的编码风格,你不使用的可选例如
fileprivate func setupMapView() {
let mView = MKMapView(frame: CGRect(x: 0, y: 20, width: view.frame.width, height: view.frame.height))
mView.showsUserLocation = true
view.addSubview(mView)
self.mapView = mView
}
此外,请确保您的Info.plist
包含NSLocationWhenInUseUsageDescription关键 - 如记录https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html