ios 在 swift 中长按时向地图视图添加图钉注释

Adding a pin annotation to a map view on a long press in swift

提问by Matt Spoon

I'm trying to make an iPhone app which requires users to be able to long press on a place on a map view to drop a pin there. Does anybody know how this is done?

我正在尝试制作一个 iPhone 应用程序，它要求用户能够长按地图视图上的某个位置以在那里放置图钉。有人知道这是怎么做的吗？

The behaviour is observable in apple maps when you long press on the screen. It will drop a pin and present an annotation saying "dropped pin"

当您长按屏幕时，在苹果地图中可以观察到这种行为。它将掉落一个大头针并显示一个注释，上面写着“掉下的大头针”

采纳答案by Josh Hamet

1) Instantiate a UILongPressGestureRecognizerand add it to the MKMapView.

1) 实例化 aUILongPressGestureRecognizer并将其添加到MKMapView.

2) When the selector gets called after the user has a long press, call the addAnnotation methodin MKMapViewwith the appropriate title and coordinate.

2）当用户有一长按之后的选择器被调用，调用addAnnotation方法在MKMapView用适当的标题和坐标。

3) Then make sure you conform to the MKMapViewDelegateand implement viewForAnnotation:which will be called right after you add the annotation and return a MKPinAnnotationView

3）然后确保您符合将在添加注释并返回后立即调用的MKMapViewDelegate和实现viewForAnnotation:MKPinAnnotationView

回答by itzhar

1. add UILongPressGestureRecognizerto your MapView

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

2. Add annotation on Long press detect - func:

   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. or you can add annotation without any title:

   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)
   }
   

1. 添加UILongPressGestureRecognizer到您的 MapView

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

2. 在长按检测上添加注释 - 功能：

   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)
   }
   

回答by oscar castellon

First declare UIGestureRecognizerin viewDidLoad

首先声明UIGestureRecognizer在viewDidLoad

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

Second add the function for longPress

二、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(wayAnnotation)
}

I recommend creating the annotations in an array that will serve you later if you want to delete it, like this...

我建议在一个数组中创建注释，如果你想删除它，稍后将为你服务，就像这样......

var myAnnotations = [MKPointAnnotation]()

If you have different annotations, you can delete only the annotations you want, for that when you add a new annotation add to the array. To delete only one group of annotations just do the following

如果您有不同的注释，您可以只删除您想要的注释，因为当您添加新注释时将其添加到数组中。要仅删除一组注释，只需执行以下操作

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

To delete all annotations try

要删除所有注释，请尝试

mapView.removeAnnotations(mapView.annotations)

Apologies for the translation....

为翻译道歉......

回答by K. Sergey

Update Swift3

更新 Swift3

func action(gestureRecognizer:UIGestureRecognizer){
    let touchPoint = gestureRecognizer.location(in: mapView)
    let newCoordinates = mapView.convert(touchPoint, toCoordinateFrom: mapView)
    let annotation = MKPointAnnotation()
    annotation.coordinate = newCoordinates
    mapView.addAnnotation(annotation)
}