[Swift]AVFoundationでカメラを使う

ソース元

https://akira-watson.com/iphone/camera.html
https://sites.google.com/a/gclue.jp/swift-docs/ni-yinki100-ios/3-avfoundation/002-kamerano-qi-dongto-hua-xiangno-bao-cun

この2つのソースコードを使いました。

コード

ViewController

import UIKit
import AVFoundation

class ViewController: UIViewController {
    
    //カメラセッション
    var captureSession: AVCaptureSession!
    //デバイス
    var cameraDevices: AVCaptureDevice!
    //画像のアウトプット
    var imageOutput: AVCaptureStillImageOutput!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        //セッションの作成
        captureSession = AVCaptureSession()
        
        //デバイス一覧の取得
        let devices = AVCaptureDevice.devices()
        
        //バックカメラをcameraDevicesに格納
        for device in devices {
            if device.position == AVCaptureDevicePosition.Back {
                cameraDevices = device as! AVCaptureDevice
            }
        }
        
        //バックカメラからVideoInputを取得
        let videoInput: AVCaptureInput!
        do {
            videoInput = try AVCaptureDeviceInput.init(device: cameraDevices)
        } catch {
            videoInput = nil
        }
        
        //セッションに追加
        captureSession.addInput(videoInput)
        
        //出力先を生成
        imageOutput = AVCaptureStillImageOutput()
        
        //セッションに追加
        captureSession.addOutput(imageOutput)
        
        //画像を表示するレイヤーを生成
        let captureVideoLayer: AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer.init(session: captureSession)
        captureVideoLayer.frame = self.view.bounds
        captureVideoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        
        //Viewに追加
        self.view.layer.addSublayer(captureVideoLayer)
        
        //セッション開始
        captureSession.startRunning()
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func cameraStart(sender: AnyObject) {
        //ビデオ出力に接続
        let captureVideoConnection = imageOutput.connectionWithMediaType(AVMediaTypeVideo)
        
        //接続から画像を取得
        self.imageOutput.captureStillImageAsynchronouslyFromConnection(captureVideoConnection) { (imageDataBuffer, error) -> Void in
            //取得したImageのDataBufferをJPEGを変換
            let capturedImageData: NSData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataBuffer)
            //JPEGからUIImageを作成
            let Image: UIImage = UIImage(data: capturedImageData)!
            //アルバムに追加
            UIImageWriteToSavedPhotosAlbum(Image, self, nil, nil)
        }
    }


}

GitHub