My Solutions to the Silver and Golden Challenges

iOS Programming: The Big Nerd Ranch Guide (6th Edi 6. Programming Views
1

Here you are my solutions to the Silver and Golden Challenges as they are tightly connected.

Show here only the source code related to these solutions.

import MapKit
import CoreLocation

class MapViewController: UIViewController, CLLocationManagerDelegate {

var mapView: MKMapView!
let locationManager = CLLocationManager()
var pins: [MKAnnotation]?
var pinItem = 1

override func loadView() {
    super.loadView()
    mapView = MKMapView()
    mapView.showsUserLocation = false
    view = mapView
    
    let locationButton = UIButton(type: .system)
    locationButton.backgroundColor = UIColor.clear
    let image = UIImage(named: "Tag.png")
    locationButton.setImage(image, for: .normal)
    locationButton.sizeToFit()
    locationButton.addTarget(self, action: #selector(showUserLocation), for: .touchUpInside)
    locationButton.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(locationButton)
    let bottomLocationButtonConstrain = locationButton.bottomAnchor.constraint(equalTo: bottomLayoutGuide.topAnchor, constant: -16)
    bottomLocationButtonConstrain.isActive = true
    let trailingLocationButtonConstrain = locationButton.trailingAnchor.constraint(equalTo: magins.trailingAnchor)
    trailingLocationButtonConstrain.isActive = true
    
    let pinsButton = UIButton(type: .system)
    pinsButton.backgroundColor = UIColor.clear
    let pinsImage = UIImage(named: "Pin.png")
    pinsButton.setImage(pinsImage, for: .normal)
    pinsButton.sizeToFit()
    pinsButton.addTarget(self, action: #selector(showPins), for: .touchUpInside)
    pinsButton.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(pinsButton)
    let bottomPinsButtonConstrain = pinsButton.bottomAnchor.constraint(equalTo: locationButton.topAnchor, constant: -16)
    bottomPinsButtonConstrain.isActive = true
    let trailingPinsButtonConstrain = pinsButton.trailingAnchor.constraint(equalTo: magins.trailingAnchor)
    trailingPinsButtonConstrain.isActive = true
}

//MARK: - MKMapViewDelegate
func requestStatus() -> Bool {
    let authStatus = CLLocationManager.authorizationStatus()
    if authStatus == .notDetermined {
        locationManager.requestWhenInUseAuthorization()
        return true
    }
    if authStatus == .denied || authStatus == .restricted {
        showLocationServicesDeniedAlert()
        return true
    }
    return false
}

@objc func showUserLocation() {
    if requestStatus() {
        return
    }
    if let pins = pins {
        mapView.removeAnnotations(pins)
    }
    mapView.userTrackingMode = .follow
    mapView.showsUserLocation = true
}

@objc func showPins() {
    if requestStatus() {
        return
    }
    if pins == nil {
        pins = [MKAnnotation]()
        mapView.showsUserLocation = false
        pins!.append(mapView.userLocation)
        let bacotaPin = Pin(title: "Bacota Bay", coordinate: CLLocationCoordinate2D(latitude: 48.585714, longitude: 26.998488), subtitle: "Love to come here")
        pins!.append(bacotaPin)
        let maliyivtsiPin = Pin(title: "Maliyivtsi", coordinate: CLLocationCoordinate2D(latitude: 48.991991, longitude: 26.996249), subtitle: "Nice place to visit")
        pins!.append(maliyivtsiPin)
        mapView.addAnnotation(pins![0] as MKAnnotation)
        mapView.userTrackingMode = .follow
    } else {
        mapView.showsUserLocation = false
        if pinItem == 3 {
            pinItem = 0
        }
        mapView.removeAnnotations(pins!)
        mapView.addAnnotation(pins![pinItem])
        let region = MKCoordinateRegionMakeWithDistance(pins![pinItem].coordinate, 1000, 1000)
        mapView.setRegion(mapView.regionThatFits(region), animated: true)
        pinItem += 1
    }
}

func showLocationServicesDeniedAlert() {
    let alertController = UIAlertController(title: "Location Services Disabled", message: "Please enable location services for this app in Settings", preferredStyle: .alert)
    let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
    alertController.addAction(okAction)
    present(alertController, animated: true, completion: nil)
}

}

class Pin: NSObject, MKAnnotation {
var title: String?
var coordinate: CLLocationCoordinate2D
var subtitle: String?

init(title: String?, coordinate: CLLocationCoordinate2D, subtitle: String?) {
    self.title = title
    self.coordinate = coordinate
    self.subtitle = subtitle
}

}