在swift中长按时将图钉注释添加到地图视图中

Question

我正在尝试制作一个iPhone应用程序,要求用户能够长时间按下地图视图上的某个位置以放置针.有谁知道这是怎么做的？

当您长按屏幕时,可以在Apple地图中观察到该行为.它将丢弃一个引脚并提供一个注释说"掉针"

Answer 1

1. 添加UILongPressGestureRecognizer到MapView

   var uilgr = UILongPressGestureRecognizer(target: self, action: "addAnnotation:")
   uilgr.minimumPressDuration = 2.0
   
   map.add (uilgr)
   
   //IOS 9
   map.addGestureRecognizer(uilgr) 
   

2. 在Long press detect - func上添加注释:

   func addAnnotation(gestureRecognizer:UIGestureRecognizer){
       if gestureRecognizer.state == UIGestureRecognizerState.Began {
           var touchPoint = gestureRecognizer.locationInView(map)
           var newCoordinates = map.convertPoint(touchPoint, toCoordinateFromView: map)
           let annotation = MKPointAnnotation()
           annotation.coordinate = newCoordinates
   
           CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: newCoordinates.latitude, longitude: newCoordinates.longitude), completionHandler: {(placemarks, error) -> Void in
               if error != nil {
                   println("Reverse geocoder failed with error" + error.localizedDescription)
                   return
               }
   
           if placemarks.count > 0 {
               let pm = placemarks[0] as! CLPlacemark
   
               // not all places have thoroughfare & subThoroughfare so validate those values
               annotation.title = pm.thoroughfare + ", " + pm.subThoroughfare
               annotation.subtitle = pm.subLocality
               self.map.addAnnotation(annotation)
               println(pm)
           }
           else {
               annotation.title = "Unknown Place"
               self.map.addAnnotation(annotation)
               println("Problem with the data received from geocoder")
           }
           places.append(["name":annotation.title,"latitude":"\(newCoordinates.latitude)","longitude":"\(newCoordinates.longitude)"])
       })
   }
   }
   

3. 或者您可以添加没有任何标题的注释:

   func action(gestureRecognizer:UIGestureRecognizer){
       var touchPoint = gestureRecognizer.locationInView(map)
       var newCoordinates = map.convertPoint(touchPoint, toCoordinateFromView: map)
       let annotation = MKPointAnnotation()
       annotation.coordinate = newCoordinates
       map.addAnnotation(annotation)
   }
   

Answer 2

1)实例化a UILongPressGestureRecognizer并将其添加到MKMapView.

2)当用户长按后调用选择器时,使用适当的标题和坐标调用addAnnotation方法MKMapView.

3)然后确保在添加注释并返回a之后符合MKMapViewDelegate并实现viewForAnnotation:将被调用的权限MKPinAnnotationView

Answer 3

首先UIGestureRecognizer在viewDidLoad

let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(addWaypoint(longGesture:)))
mapView.addGestureRecognizer(longGesture)

第二个为longPress添加功能

@objc func addWaypoint(longGesture: UIGestureRecognizer) {

    let touchPoint = longGesture.location(in: mapView)
    let wayCoords = mapView.convert(touchPoint, toCoordinateFrom: mapView)
    let location = CLLocation(latitude: wayCoords.latitude, longitude: wayCoords.longitude)
    myWaypoints.append(location)

    let wayAnnotation = MKPointAnnotation()
    wayAnnotation.coordinate = wayCoords
    wayAnnotation.title = "waypoint"
    myAnnotations.append(location)
}

我建议在数组中创建注释，以便以后删除时为您服务，例如...

var myAnnotations = [CLLocation]()

如果具有不同的注释，则只能删除所需的注释，为此，当您向数组中添加新注释时会添加该注释。要仅删除一组注释，只需执行以下操作

for dots in myAnnotations{
    mapView.removeAnnotation(dots)
}

要删除所有注释，请尝试

mapView.removeAnnotations(mapView.annotations)

抱歉，翻译...。