在 swift 中通过长按向地图视图添加图钉注释

Question

我正在尝试制作一个 iPhone 应用程序，该应用程序要求用户能够长按地图视图上的某个位置以在该位置放置图钉。有人知道这是怎么做到的吗？

当您长按屏幕时，在苹果地图中可以观察到该行为。它会放下一个图钉并显示一个注释 "dropped pin"

Answer 1

1) 实例化一个UILongPressGestureRecognizer并将其添加到MKMapView。

2）当用户长时间按下选择器时，请使用适当的标题和坐标来调用 addannotation方法 in MKMapView。

3) 然后确保您符合 MKMapViewDelegate 并实施 viewForAnnotation:，这将在您添加注释和 return 后立即调用 MKPinAnnotationView

Answer 2

将 UILongPressGestureRecognizer 添加到您的 MapView

var uilgr = UILongPressGestureRecognizer(target: self, action: "addAnnotation:")
uilgr.minimumPressDuration = 2.0

map.add (uilgr)

//IOS 9
map.addGestureRecognizer(uilgr)

在长按检测上添加注释 - 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)"])
    })
}
}

或者您可以添加不带任何标题的注释：

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 3

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)
}

Answer 4

首先在viewDidLoad

中声明UIGestureRecognizer

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

第二次添加长按功能

@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)
}

我建议在一个数组中创建注释，如果您想删除它，稍后将为您服务，就像这样...

var myAnnotations = [MKPointAnnotation]()

如果你有不同的注释，你可以只删除你想要的注释，因为当你添加一个新的注释添加到数组中时。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)

对翻译表示歉意....

在 swift 中通过长按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

maps

annotations

mkmapview

ios

swift