我怎样才能让我的图钉落在带有动画的 MKMapView 上（并且可能 - 比平时慢）

Question

我有一个代码可以在 MKMapView 的可见部分显示 10 个自定义图钉：

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

    if !(annotation is MKPointAnnotation) {
        return nil
    }

    var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: "demo")
    if annotationView == nil {
        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "demo")
        annotationView!.canShowCallout = true
    }
    else {
        annotationView!.annotation = annotation
    }

    annotationView!.image = UIImage(named: "OtherPin")
    return annotationView

}

生成随机图钉的函数是：

func addPinsToMap(mapView: MKMapView, amount howMany:Int) {

//First we need to calculate the corners of the map so we get the points
    let nePoint:CGPoint = CGPoint(mapView.bounds.origin.x + mapView.bounds.size.width, mapView.bounds.origin.y);
    let swPoint:CGPoint = CGPoint((mapView.bounds.origin.x), (mapView.bounds.origin.y + mapView.bounds.size.height));

//Then transform those point into lat,lng values
    let neCoord:CLLocationCoordinate2D = mapView.convert(nePoint, toCoordinateFrom: mapView)
    let swCoord:CLLocationCoordinate2D = mapView.convert(swPoint, toCoordinateFrom: mapView)

// Loop
for _ in 0 ..< howMany {

    let latRange:Double = Double(self.randomBetweenNumbers(firstNum: CGFloat(neCoord.latitude), secondNum: CGFloat(swCoord.latitude)))
    let longRange:Double = Double(self.randomBetweenNumbers(firstNum: CGFloat(neCoord.longitude), secondNum: CGFloat(swCoord.longitude)))

// Add new waypoint to map
    let location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latRange, longRange);

    let annotation = MKPointAnnotation()
    //let centerCoordinate = CLLocationCoordinate2D(latitude: 41, longitude:29)
    annotation.coordinate = location
    annotation.title = "Title"
    mapView.addAnnotation(annotation)

}//end

}//end

使用上面的代码，当用户打开地图时，他会看到图钉已经放置在一些随机位置。我的问题是 - 我怎样才能让大头针一个接一个地掉落，如果可能的话 - 我可以让它们慢慢掉落，让每个大头针掉落 1-2 秒而不是立即移动吗？

Answer 1

有一个属性的动画注释 animatesDrop 你可以这样设置它

annotationView!.canShowCallout = true
annotationView!.animatesDrop = true

勾选this

我怎样才能让我的图钉落在带有动画的 MKMapView 上（并且可能 - 比平时慢）

how can I make my pins drop on the MKMapView with animation (and possibly - slower than normally)

mapkit

mkannotationview

ios

mkpointannotation

swift