@H_502_1@我试图在
Swift中改变MKMapView上的图像,但遗憾的是它不起作用.任何想法我做错了什么？我在这里看到了一些例子,但没有奏效.
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
}
}
GreenDot图片可在其他地方使用.
解决方法
别忘了设置：
map.delegate = self
并确保您的UIViewController实现MKMapViewDelegate协议.
如果您忘记执行此操作,则不会为您的地图调用mapView：viewForAnnotation：的实现.
此外,它看起来像pinView！.animatesDrop = true打破自定义图像.您必须将其设置为false,或使用MKAnnotationView(没有animatesDrop属性).
如果要实现自定义拖放动画,请参阅this related question.
