Error: Could not cast value of type NSKVONotifying_MKUserLocation to Park_View.AttractionAnnotation

Question

When using this func:

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
    let annotationView = AttractionAnnotationView(annotation: annotation, reuseIdentifier: "Attraction")
    annotationView.canShowCallout = true
    return annotationView
}

This error occured:

Could not cast value of type 'NSKVONotifying_MKUserLocation' (0x7e8a62b0) to 'Park_View.AttractionAnnotation' (0xf7948).

It is working well but when I try to add CoreLocation to find the user location to my code I start having this error.

Answer 1

我发现MKUserLocation也是一个注释。

这是我出来的解决方案，它解决了错误。

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
    if (annotation is MKUserLocation) {
        return nil
    }
    else {
        let annotationView = AttractionAnnotationView(annotation: annotation, reuseIdentifier: "Attraction")
        annotationView.canShowCallout = true
        return annotationView
    }
}

Answer 2

可能是函数＆＃34; AttractionAnnotationView：＆＃34;返回MKUserLocation对象而不是＆＃39; AttractionAnnotation＆＃39;对象

Answer 3

您的AttractionAnnotation类中是否有自定义重写的isEqual()函数？如果是这样，请在比较之前检查它是否未将比较对象（函数参数）强制转换为AttractionAnnotation。

Answer 4

当您单击/轻按用户位置时，Xcode 10.2中也会发生相同的事情，因此请尝试以下操作：

func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {

    if (view.annotation is MKUserLocation) {
        return
    }
    ...
}