使用注释引脚创建长按手势识别器

Question

到目前为止我所做的是创建一张地图.然后显示用户位置并居中,以便地图在旅行时居中(汽车等)

但是现在我想添加一个长按手势,这样如果用户输入一个引脚就会被丢弃.我一直在努力学习教程和模拟器崩溃.

我如何添加,longPressGesturerecognizer以便它在我的上面放一个别针mapView.

这是我的代码 -

import UIKit
import MapKit
import CoreLocation

class Page2: UIViewController, MKMapViewDelegate,  CLLocationManagerDelegate{

    @IBOutlet var mapView: MKMapView!
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.requestWhenInUseAuthorization()
        self.locationManager.startUpdatingLocation()
        //blue dot on the map
        self.mapView.showsUserLocation = true
        //tracking mode on
        self.mapView.userTrackingMode = .follow
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // location Manager Delegate center user on map
    private func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

        let location = locations.last
        let center = CLLocationCoordinate2D(latitude: location!.coordinate.latitude, longitude: (location?.coordinate.longitude)!)
        let region = MKCoordinateRegion(center: center, span: MKCoordinateSpan(latitudeDelta: 0.005, longitudeDelta: 0.005)) //zoom on map
        self.mapView.setRegion(region, animated: true)
        self.locationManager.stopUpdatingLocation()
    }

    // print errors
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error){
        print("Errors: " + error.localizedDescription)
    }
}

Answer 1

首先在Swift 3 中更改CLLocationManagerDelegate方法的签名locationManager(_:didUpdateLocations:),因此您需要更改该方法,如下所示.

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
     //your code and don't forgot to remove private
}

你可以用longGesture与mapView这样的,首先addGestureRecognizer在你mapView的viewDidLoad.

let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(addAnnotationOnLongPress(gesture:)))
longPressGesture.minimumPressDuration = 1.0
self.mapView.addGestureRecognizer(longPressGesture)

现在为此添加操作UILongPressGestureRecognizer.

func addAnnotationOnLongPress(gesture: UILongPressGestureRecognizer) {

    if gesture.state == .ended {
        let point = gesture.location(in: self.mapView)
        let coordinate = self.mapView.convert(point, toCoordinateFrom: self.mapView)
        print(coordinate)
        //Now use this coordinate to add annotation on map.
        var annotation = MKPointAnnotation()
        annotation.coordinate = coordinate
        //Set title and subtitle if you want
        annotation.title = "Title" 
        annotation.subtitle = "subtitle" 
        self.mapView.addAnnotation(annotation)
    }
}