[iOS]How to change the scale of the Map

さて前回に続いてMkMapViewのお話です。
今回はプログラムでMkMapViewの縮尺を変更する方法についてご紹介します。
I'm writing the method of MkMapView from last time.
I introduce how to change the scale of MkMapView in program this time.

写真はPocket Note(These are pictures of Pocket Note.)

環境(Environtment)：Xcode 8,Swift 3

MkMapViewの縮尺はregion.span.latitudeDelta(上下の緯度の差)、region.span.longitudeDelta(左右の経度の差)で定義されています。
これらの値を小さくするとMkMapViewの縮尺が大きくなり、値を大きくするとMkMapViewの縮尺が小さくなります。
The scale of MkMapView is decided by region.span.latitudeDelta(distance between the top of the latitude and bottom of the latitude) and region.span.longitudeDelta(distance between the right of the longitude and the left of the longitude).
If these values are downed, the scale of MkMapView is upped.
If these values are upped, the scale of MkMapView is downed.

・地図の縮尺を拡大(The scale of MkMapView is upped)

import MapKit

・・・・・・・・

let mkMapView:MKMapView = MKMapView()

・・・・・・・・

var latitudeDelta = mkMapView.region.span.latitudeDelta

var longitudeDelta = mkMapView.region.span.longitudeDelta

latitudeDelta = latitudeDelta/5

longitudeDelta = longitudeDelta/5

        

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

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

mkMapView.setRegion(region, animated: true)

・地図の縮尺を縮小(The scale of MkMapView is downed)

import MapKit

・・・・・・・・

let mkMapView:MKMapView = MKMapView()

・・・・・・・・

var latitudeDelta = mkMapView.region.span.latitudeDelta

var longitudeDelta = mkMapView.region.span.longitudeDelta

latitudeDelta = latitudeDelta*5

longitudeDelta = longitudeDelta*5

        

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

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

mkMapView.setRegion(region, animated: true)

コード全文は以下の様になります。
The 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)

        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)

    }

}

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