如何防止自动取消选择注释 swift

Question

我有一个视图，里面有一张地图。我想实现以下目标：当用户点击地图时显示并选择注释（因此显示标注气泡）直到用户点击地图上的另一个点（在这种情况下，应该删除之前的注释).

问题是，当我点击地图时，注释被添加并被选中了一小会儿，然后它以某种方式被取消选择（因此标注消失）。我希望标注气泡持续存在，直到用户点击另一个点

下面是我的尝试，请问有没有大佬帮帮我？

@objc func handleTap(_ sender: UITapGestureRecognizer){

    //...some code that computes the country code starting from latitude and longitude

            var countryCurrency = ""

            func countryRequest(countryLabel: String, completion: @escaping (String)->()){
                //api request that receives the currency name of the country
                completion(countryCurrency)
            }
            countryRequest(countryLabel: countryLabel){ countryCurrency in

                DispatchQueue.main.async {

                    let locat:CLLocationCoordinate2D = CLLocationCoordinate2DMake(locationCoord.latitude, locationCoord.longitude)
                    let annotation = MKPointAnnotation()
                    annotation.coordinate = locat
                    annotation.title = countryCurrency
                    annotation.subtitle = "subtitle"
                    self.mapView.addAnnotation(annotation)
                    self.mapView.selectAnnotation(annotation, animated: true)

                }

            }
}

我还有一个 MKMapViewDelegate 的扩展来自定义标注：

extension MapsItem: MKMapViewDelegate {

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

    if !(annotation is MKPointAnnotation){
        return nil
    }

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

    return annotationView

}
}

提前致谢！！

Answer 1

试试这个

在添加注释之前将 isTappingNow 设置为 true，在选择它之后设置为 false

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

      if(!isTappingNow)
      {

           self.mapView.selectAnnotation(view.annotation, animated: false)
      } 

    }

Answer 2

一直在寻找解决方案，不知道为什么会这样，是不是bug？到现在为止，我做了一个技巧来延迟它出现。 @Sh_Khan的方案会再闪一次callout，我的方案会让用户等一会

DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {

    let locat:CLLocationCoordinate2D = CLLocationCoordinate2DMake(locationCoord.latitude, locationCoord.longitude)
    let annotation = MKPointAnnotation()
    annotation.coordinate = locat
    annotation.title = countryCurrency
    annotation.subtitle = "subtitle"
    self.mapView.addAnnotation(annotation)
    self.mapView.selectAnnotation(annotation, animated: true)
}

如何防止自动取消选择注释 swift

how to prevent deselection of an annotation automatically swift

mapkit

ios

mkmapviewdelegate

swift