OptionalなどSwiftとObjective-Cの違いを意識してPhotos Frameworkを使う：iPhone 6／6 Plusアプリ開発入門（4）（1/3 ページ）

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
 
    self.mapView.rotateEnabled = false
    self.mapView.pitchEnabled = false
 
    let centerCoordinate = CLLocationCoordinate2D(latitude: 35.681382, longitude: 139.766084)
    let initialSpan = MKCoordinateSpan(latitudeDelta: 0.4, longitudeDelta: 0.4)
    let initialRegion = MKCoordinateRegion(center: centerCoordinate, span: initialSpan)
    self.mapView.setRegion(initialRegion, animated: true)
}

func メソッド名 (仮引数: 型) -> 戻り値の型 {
  // 処理
}

private func prepareMapView() {
    self.mapView.rotateEnabled = false
    self.mapView.pitchEnabled = false
 
    let centerCoordinate = CLLocationCoordinate2D(latitude: 35.681382, longitude: 139.766084)
    let initialSpan = MKCoordinateSpan(latitudeDelta: 0.4, longitudeDelta: 0.4)
    let initialRegion = MKCoordinateRegion(center: centerCoordinate, span: initialSpan)
    self.mapView.setRegion(initialRegion, animated: true)
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
 
    self.prepareMapView()
}

import UIKit
import MapKit
import Photos // 追加

private func checkAuthorizationStatus() {
    let status = PHPhotoLibrary.authorizationStatus()
 
    switch status {
    case .Authorized:
        self.prepareAnnotations()
    default:
        PHPhotoLibrary.requestAuthorization{ status in
            if status == .Authorized {
                self.prepareAnnotations()
            }
        }
    }
}
 
private func prepareAnnotations() {
    // 処理
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    
    self.prepareMapView()
    self.checkAuthorizationStatus()
}

enum PHAuthorizationStatus : Int {
    case NotDetermined
    case Restricted
    case Denied
    case Authorized
}