如何将红色Pin更改为自定义图像？ iOS

Question

我创建了一个简单的地图，从变量中获取引脚的位置。由于测试目的，我只使用用户位置。现在我想将红色Pin更改为自定义图像。我怎么做？ 图像有多大？ 我知道这是一个简单的问题，但我是新来的迅速编码，并希望你能帮助我。

这里是我的代码：

import UIKit 
import CoreLocation 
import MapKit 

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate{ 
var locationService = CLLocationManager() 

@IBOutlet weak var ly: UILabel! 

@IBOutlet weak var lx: UILabel! 
var reuseID = "myposition"; 
var annotation: MKAnnotation? 
var pinAnnotationView:MKPinAnnotationView! 

@IBOutlet weak var mapView: MKMapView! 


override func viewDidLoad() { 
    super.viewDidLoad() 
    mapView.showsUserLocation = false 
    locationService.desiredAccuracy = kCLLocationAccuracyNearestTenMeters 
    locationService.delegate = self 
    locationService.requestAlwaysAuthorization() 
} 
override func viewWillAppear(_ animated: Bool) { 
    super.viewWillAppear(animated) 
    locationService.startUpdatingLocation() 
} 
override func viewWillDisappear(_ animated: Bool) { 
    super.viewWillDisappear(animated) 
    locationService.stopUpdatingLocation() 
} 
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 
    locations.forEach { location in 
     print("location changed: (\(location.coordinate.latitude), \(location.coordinate.longitude))") 
     lx.text = String(location.coordinate.latitude) 
     ly.text = String(location.coordinate.longitude) 
    } 
    if (locations.count > 0) { 
     if let an = annotation { 
      mapView.removeAnnotation(an) 
      annotation = nil 
     } 
     let loc = locations[0] 
     let location2D = CLLocationCoordinate2D(latitude:loc.coordinate.latitude, longitude:loc.coordinate.longitude) 
     centerMap(location: location2D) 
     let pointAnnotation = MKPointAnnotation() 
     pointAnnotation.coordinate = location2D 
     annotation = pointAnnotation 
     mapView.addAnnotation(pointAnnotation) 
         } 
} 
func centerMap(location: CLLocationCoordinate2D) { 
    let span = MKCoordinateSpanMake(0.1, 0.1) 
    let region = MKCoordinateRegionMake(location, span); 
    mapView.setRegion(region, animated: true) 

} 

} 

Answer 1

import UIKit 
import MapKit 

class AlarmMapViewController: UIViewController { 
    @IBOutlet weak var map: MKMapView! 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     showAlarms() 
     map.showsUserLocation = true 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
    } 

    func showAlarms(){ 

     map.region.center.latitude = 49 
     map.region.center.longitude = 12 
     map.region.span.latitudeDelta = 1 
     map.region.span.longitudeDelta = 1 

     for alarm in Alarms.sharedInstance.alarms { 

      let location = CLLocationCoordinate2D(
       latitude: Double(alarm.latitude), 
       longitude: Double(alarm.longtitude) 
      ) 

      let annotation = MKPointAnnotation() 
      annotation.setCoordinate(location) 
      annotation.title = alarm.name 
      annotation.subtitle = alarm.description 
      mapView(map, viewForAnnotation: annotation).annotation = annotation 
      map.addAnnotation(annotation) 
     } 
    } 

    @IBAction func zoomIn(sender: AnyObject) { 
    } 

    @IBAction func changeMapType(sender: AnyObject) { 
    } 

    func mapView(mapView: MKMapView!, 
     viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! { 

     if annotation is MKUserLocation { 
      //return nil so map view draws "blue dot" for standard user location 
      return nil 
     } 

     let reuseId = "pin" 
     var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView 
     if pinView == nil { 
      pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId) 
      pinView!.canShowCallout = true 
      pinView!.animatesDrop = true 
      pinView!.image = UIImage(named:"GreenDot")! 

     } 
     else { 
      pinView!.annotation = annotation 
     } 

     return pinView 
    } 
}