Question

我正在尝试制作一款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一个针脚。有人知道这是怎么做的吗？

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“drop pin”

Answer 1

将UILongPressGestureRecognizer添加到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 - 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)"])
    })
}
}

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MKMapView中的 addAnnotation方法。

3）然后确保您符合MKMapViewDelegate并实施viewForAnnotation:，您将在添加注释后立即调用MKPinAnnotationView

Answer 3

首先在UIGestureRecognizer

中声明viewDidLoad

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

第二次添加longPress函数

@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，如果你想删除它，将在以后为你服务，就像这样......

var myAnnotations = [CLLocation]()

如果您有不同的注释，则只能删除所需的注释，以便在向阵列添加新的注释添加时。要仅删除一组注释，请执行以下操作

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

要删除所有注释，请尝试

mapView.removeAnnotations(mapView.annotations)

道歉......

Answer 4

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)
}

在swift中长按时将图钉注释添加到地图视图中

4 个答案: