带 LongPressGestureRecognizer 的 Mapkit 间歇性工作

Question

我有一个非常简单的设置，我有一个 MapKit，我希望每次用户在地图上长按时都能将图钉放到它上面。它适用于第一个引脚。但是，如果用户尝试再次长按（在另一个位置），则无法识别该手势。第三次成功，第四次失败，依此类推（每一次奇怪的尝试都会被识别）。

我有一个示例项目可以证明这一点： https://github.com/alexwibowo/SimpleLocationMarker

基本上，我的视图控制器如下所示：

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView! {
        didSet{
            let gestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.addNewAnnotation(recognizer:)))
            gestureRecognizer.minimumPressDuration = 0.5
            mapView.addGestureRecognizer(gestureRecognizer)
        }
    }
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @objc func addNewAnnotation(recognizer: UILongPressGestureRecognizer){
        if (recognizer.state != .began) {
            return
        }

        let touchPoint = recognizer.location(in: mapView)
        let wayCoords = mapView.convert(touchPoint, toCoordinateFrom: mapView)

        let annotation = MKPointAnnotation()
        annotation.title = "New"
        annotation.coordinate = wayCoords
        mapView.addAnnotation(annotation)
    }
}

extension ViewController: MKMapViewDelegate {

    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        let identifier = "locationMarkerIdentifier"
        var view: MKPinAnnotationView

        if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
            as? MKPinAnnotationView {
            dequeuedView.annotation = annotation
            view = dequeuedView
        } else {
            view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            view.annotation = annotation
            view.canShowCallout = true
            view.isDraggable = true
            view.calloutOffset = CGPoint(x: -5, y: 5)
            view.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
        }
        return view
    }


}

我确定这是我犯的一个非常简单的错误！

Answer 1

首先，将其委托设置为自己。

@IBOutlet weak var mapView: MKMapView! {
    didSet{
        let gestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.addNewAnnotation(recognizer:)))
        gestureRecognizer.minimumPressDuration = 0.5
        mapView.addGestureRecognizer(gestureRecognizer)
        gestureRecognizer.delegate = self
    }
}

第二，

extension ViewController : UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

带 LongPressGestureRecognizer 的 Mapkit 间歇性工作

Mapkit with LongPressGestureRecognizer working intermittently

mapkit

uigesturerecognizer

ios

swift