自定义图像作为带有两个不同颜色图像的注释图钉

Question

我正在尝试为我的图钉注释添加自定义图像，并为某些注释更改自定义图像的颜色。颜色改变了。但是，图像不会显示。改为显示默认引脚。

这是我的代码：

class MyPointAnnotation : MKPointAnnotation {
    var pinTintColor: UIColor?
}

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate{
    @IBOutlet weak var map: MKMapView!

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "myAnnotation") as? MKPinAnnotationView

        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myAnnotation")
            annotationView?.canShowCallout = true
        } else {
            annotationView?.annotation = annotation
        }

        if annotation is MKUserLocation {
            return nil
        }

        if let annotation = annotation as? MyPointAnnotation {
            annotationView?.pinTintColor = annotation.pinTintColor
            annotationView?.image = UIImage(named: "BLog.png")
        }

        return annotationView
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.map.delegate = self  

        let annotation1 = MyPointAnnotation()
        annotation1.coordinate = CLLocationCoordinate2DMake([LatArray], [LonArray])
        annotation1.title = NameArray
        annotation1.pinTintColor = .red

        let annotation2 = MyPointAnnotation()
        annotation2.coordinate = CLLocationCoordinate2DMake([LatArray2], [LonArray2])
        annotation2.title = NameArray2
        annotation2.pinTintColor = .green
    } 
}

图像 "BLog.png" 位于主包中。我已将 MKMapView 指定为委托。

但是图像还是不会变。

Answer 1

您需要使用 MKAnnotationView 而不是 MKPinAnnotationView 来为您的图钉注释添加自定义图像。

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if annotation is MKUserLocation {
        return nil
    }

    if // Image pin // {
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "image")
        if annotationView == nil {
            annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "image")
            annotationView?.canShowCallout = true
            annotationView?.image = UIImage(named: "BLog.png")

            let rightButton: AnyObject! = UIButton(type: UIButtonType.detailDisclosure)
            annotationView?.rightCalloutAccessoryView = rightButton as? UIView
        }
        else {
            annotationView?.annotation = annotation
        }
        return annotationView
    } else {
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "myAnnotation") as? MKPinAnnotationView
        if annotationView == nil {
            annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myAnnotation")
            annotationView?.canShowCallout = true
        } else {
            annotationView?.annotation = annotation
        }
        if let annotation = annotation as? MyPointAnnotation {
            annotationView?.pinTintColor = annotation.pinTintColor
        }
        return annotationView
    }
}

自定义图像作为带有两个不同颜色图像的注释图钉

Custom image as annotation pin with two different colour images

swift

uiimage

mkmapview

mkannotation