如何在调用函数时自动显示 MKPointAnnotation 标题？

Question

我正在创建一个函数，当它被调用时，它会放大自定义图钉注释坐标并显示其标题和副标题。缩放部分很好用，我唯一做不到的是标题和副标题部分。

 private func addCustomPinRectoría1() {
        let pin1 = MKPointAnnotation()
        pin1.coordinate = coordinatesRectoría1
        pin1.title = "Rectoría"
        pin1.subtitle = "Parada TigreBus"
        map.addAnnotation(pin1)

  func selectAnnotation(_ vc: ContentViewController, didSelectLocationWith coordinates: CLLocationCoordinate2D?) {
        guard let coordinates = coordinates else {
            return
        }
        map.removeAnnotations(map.annotations)
        let selectedPin = MKPointAnnotation()
        selectedPin.coordinate = coordinates
        map.addAnnotation(selectedPin)

        // Here is where I need to display the pin's title and subtitle automatically

        map.setRegion(MKCoordinateRegion(
        center: coordinates,
        span: MKCoordinateSpan(latitudeDelta: 0.008, longitudeDelta: 0.008)),
                      animated: true)
        
    }

不知道有没有用，我也把这部分代码留下来：

  func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard !(annotation is MKUserLocation) else {
            return nil
        }
        var annotationView = map.dequeueReusableAnnotationView(withIdentifier: "custom")
        if annotationView == nil {
            annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: "custom")
            annotationView?.canShowCallout = true
        }
        else {
            annotationView?.annotation = annotation
        }
        annotationView?.image = UIImage(named: "TigreBusParada")
        annotationView?.frame.size = CGSize(width: 35, height: 100)
        return annotationView
    }

Answer 1

Select 添加到 mapView 后的注释。这是代码。

func selectAnnotation(_ vc: ContentViewController, didSelectLocationWith coordinates: CLLocationCoordinate2D?) {
    guard let coordinates = coordinates else {
        return
    }
    map.removeAnnotations(map.annotations)
    let selectedPin = MKPointAnnotation()
    selectedPin.coordinate = coordinates
    map.addAnnotation(selectedPin)
    
    //add this line to show the title and subtitle
    map.selectAnnotation(selectedPin, animated: false)
    
    map.setRegion(MKCoordinateRegion(
        center: coordinates,
        span: MKCoordinateSpan(latitudeDelta: 0.008, longitudeDelta: 0.008)),
                  animated: true)
    
}

如何在调用函数时自动显示 MKPointAnnotation 标题？

How to automatically show a MKPointAnnotation title when a function is called?

xcode

uikit

ios

swift