[iOS]How to Show Pin on Map

今回はMKMapView上で長押しされた場所にPinを立てる方法についてご紹介します。
I introduce how to show Pin on the place which is done with a long press of MKMapView this time.

[写真はPocket Note(This pic is Pocket Note)]

環境[Environment]：Xcode8, Swift3

まずは 長押しを検出するUILongPressGestureRecognizerを宣言します。
At first,declare UILongPressGestureRecognizer for detecting Long Press.

let longtapGesture = UILongPressGestureRecognizer(target:self, action:#selector(self.longPress(sender:)))

mkMapView.addGestureRecognizer(longtapGesture)

次に長押し後のイベントの中で、長押しされた位置を取得します。
Pinを立てる為に最終的にはCLLocationCoordinate2Dにします。
Next, get location of the place which is done with a long press in the event after a long press.
Get CLLocationCoordinate2D for showing Pin on the map.

let location = sender.location(in: mkMapView)

let locationCoordinate2D:CLLocationCoordinate2D = mkMapView.convert(location, toCoordinateFrom: mkMapView)

次にPinを立てる為のMKPointAnnotationを作成し、位置情報をセットして、MKMapViewに設定します。
Next, make MKPointAnnotation, and set location to MkPointAnnotation, and add MKPointannotation to MKMapView.

let annotation = MKPointAnnotation()

annotation.coordinate  = locationCoordinate2D

mkMapView.addAnnotation(annotation)

ではソースコード全文です。
Full text of code is below.

ViewController.swift

import UIKit

import MapKit

import CoreLocation

class ViewController: UIViewController,CLLocationManagerDelegate {

    let mkMapView:MKMapView = MKMapView()

    let buttonCurrentPlace:UIButton = UIButton()

    let buttonScaleUp:UIButton = UIButton()

    let buttonScaleDown:UIButton = UIButton()

    var locationManager: CLLocationManager?

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        

        mkMapView.frame = CGRect(x:10,y:50,width:350,height:500)

        let longtapGesture = UILongPressGestureRecognizer(target:self, action:#selector(self.longPress(sender:)))

        mkMapView.addGestureRecognizer(longtapGesture)

        self.view.addSubview(mkMapView)

        

        buttonCurrentPlace.frame = CGRect(x:10,y:600,width:350,height:50)

        buttonCurrentPlace.setTitle("Show Current Place", for: .normal)

        buttonCurrentPlace.setTitleColor(UIColor.blue, for: .normal)

        buttonCurrentPlace.titleLabel?.adjustsFontSizeToFitWidth = true

        buttonCurrentPlace.addTarget(self, action: #selector(self.touchUpButtonCurrentPlace), for: .touchUpInside)

        self.view.addSubview(buttonCurrentPlace)

        

        buttonScaleUp.frame = CGRect(x:10,y:660,width:350,height:50)

        buttonScaleUp.setTitle("Scale Up", for: .normal)

        buttonScaleUp.setTitleColor(UIColor.blue, for: .normal)

        buttonScaleUp.titleLabel?.adjustsFontSizeToFitWidth = true

        buttonScaleUp.addTarget(self, action: #selector(self.touchUpButtonScaleUp), for: .touchUpInside)

        self.view.addSubview(buttonScaleUp)

        

        buttonScaleDown.frame = CGRect(x:10,y:720,width:350,height:50)

        buttonScaleDown.setTitle("Scale Down", for: .normal)

        buttonScaleDown.setTitleColor(UIColor.blue, for: .normal)

        buttonScaleDown.titleLabel?.adjustsFontSizeToFitWidth = true

        buttonScaleDown.addTarget(self, action: #selector(self.touchUpButtonScaleDown), for: .touchUpInside)

        self.view.addSubview(buttonScaleDown)

        

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

    //Tap Show Current Place Button

    func touchUpButtonCurrentPlace(){

        locationManager = CLLocationManager()

        locationManager!.requestAlwaysAuthorization()

        locationManager!.delegate = self

        

        if CLLocationManager.locationServicesEnabled(){

            locationManager!.startUpdatingLocation()

        }

    }

    

    //Get Current Place

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

        //Get Details of Current Place

        let location = locations[0]

        let latitude = location.coordinate.latitude

        let longitude = location.coordinate.longitude

        let newlocation = CLLocationCoordinate2DMake(latitude,longitude)

        let span = MKCoordinateSpan(latitudeDelta: 0.005,longitudeDelta: 0.005)

        let region = MKCoordinateRegion(center: newlocation,span: span)

        

        //Show Current Place on Map

        mkMapView.setRegion(region, animated: true)

        locationManager!.stopUpdatingLocation()

        locationManager = nil

        mkMapView.showsUserLocation = false

    }

    

    //The scale of MapKitView is upped

    func touchUpButtonScaleUp(){

        var latitudeDelta = mkMapView.region.span.latitudeDelta

        var longitudeDelta = mkMapView.region.span.longitudeDelta

        latitudeDelta = latitudeDelta/5

        if (latitudeDelta < 0.0001){

            latitudeDelta = 0.0001

        }

        longitudeDelta = longitudeDelta/5

        if (longitudeDelta < 0.0001){

            longitudeDelta = 0.0001

        }

        

        let span = MKCoordinateSpan(latitudeDelta: latitudeDelta,longitudeDelta: longitudeDelta)

        let region = MKCoordinateRegion(center: mkMapView.region.center,span: span)

        mkMapView.setRegion(region, animated: true)

    }

    

    //The scale of MapKitView is downed

    func touchUpButtonScaleDown(){

        var latitudeDelta = mkMapView.region.span.latitudeDelta

        var longitudeDelta = mkMapView.region.span.longitudeDelta

        latitudeDelta = latitudeDelta*5

        if (latitudeDelta > 27.77){

            latitudeDelta = 27.77

        }

        longitudeDelta = longitudeDelta*5

        if (longitudeDelta > 16.69){

            longitudeDelta = 16.69

        }

        

        let span = MKCoordinateSpan(latitudeDelta: latitudeDelta,longitudeDelta: longitudeDelta)

        let region = MKCoordinateRegion(center: mkMapView.region.center,span: span)

        mkMapView.setRegion(region, animated: true)

    }

    

    //Detect Long Press

    func longPress(sender: UILongPressGestureRecognizer){

        

        if(sender.state != .began){

            return

        }

        

        //Get Location

        let location = sender.location(in: mkMapView)

        let locationCoordinate2D:CLLocationCoordinate2D = mkMapView.convert(location, toCoordinateFrom: mkMapView)

        

        //Create Pin

        let annotation = MKPointAnnotation()

        annotation.coordinate  = locationCoordinate2D

        

        //Delete Existing Pin

        if (mkMapView.annotations.count > 0){

            mkMapView.removeAnnotations(mkMapView.annotations)

        }

        

        //Show Pin on Map

        mkMapView.addAnnotation(annotation)

    }

}

[関連記事(Articles)]
[iOS]How to show current place on Map

[iOS]How to change the scale of the Map

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