Question

我正在制作自定义相机。我有2个用于相机的视图控制器（一个用于实际捕获，另一个用于照片预览）。这是每个中的代码，我已经对其进行了检查，但没有发现任何错误！我的XCODE项目是启用了CoreData的单个视图。编辑：我已经添加了适当的Info.Plist相机权限。

下面是我的用于拍照的ViewController：

 import UIKit
import AVFoundation

class ViewController: UIViewController {

    var captureSession = AVCaptureSession()

    var backCamera: AVCaptureDevice?
    var frontCamera: AVCaptureDevice?
    var currentCamera: AVCaptureDevice?

    var photoOutput: AVCapturePhotoOutput?

    var cameraPreviewlayer: AVCaptureVideoPreviewLayer?

    var image: UIImage?

    override func viewDidLoad() {
        super.viewDidLoad()

        setupCaptureSession()
        setupDevice()
        setupInputOutput()
        setupPreviewLayer()
        startRunningCaptureSession()

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

    func setupCaptureSession() {
        captureSession.sessionPreset = AVCaptureSession.Preset.photo
    }

    func setupDevice() {
        let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)

        let devices = deviceDiscoverySession.devices

        for device in devices {
            if device.position == AVCaptureDevice.Position.back {
                backCamera = device
            } else if device.position == AVCaptureDevice.Position.front {
                frontCamera = device
            }
        }

        currentCamera = backCamera
    }

    func setupInputOutput() {
        do {
            let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
            captureSession.addInput(captureDeviceInput)
            photoOutput = AVCapturePhotoOutput()
            photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])], completionHandler: nil)
            captureSession.addOutput(photoOutput!)
        } catch {
            print(error)
        }
    }

    func setupPreviewLayer(){
        cameraPreviewlayer = AVCaptureVideoPreviewLayer(session: captureSession)
        cameraPreviewlayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
        cameraPreviewlayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
        cameraPreviewlayer?.frame = self.view.frame
        self.view.layer.insertSublayer(cameraPreviewlayer!, at: 0)
    }

    func startRunningCaptureSession() {
        captureSession.startRunning()
    }

    @IBAction func CameraButton_TouchUpInside(_ sender: Any) {
        let settings = AVCapturePhotoSettings()

        photoOutput?.capturePhoto(with: settings, delegate: self)

       // performSegue(withIdentifier: "showPhoto_Segue", sender: nil)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showPhoto_Segue" {
            let previewVC = segue.destination as! PreviewViewController
            previewVC.image = self.image
        }
    }

    override var prefersStatusBarHidden: Bool {
        return true
    }

}

extension ViewController: AVCapturePhotoCaptureDelegate{
    func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
        if let imageData = photo.fileDataRepresentation() {
            print(imageData)
            image = UIImage(data: imageData)
            performSegue(withIdentifier: "showPhoto_Segue", sender: nil)
        }
    }


}

这是“预览”的代码，当我按“取消”或“保存”按钮进行用户刚刚拍摄的捕获时，会发生错误：

    import UIKit

class PreviewViewController: UIViewController {

    @IBOutlet weak var photo: UIImageView!

    var image: UIImage!

    override func viewDidLoad() {
        super.viewDidLoad()
        photo.image = self.image

    }

    @IBAction func cancelButton_TouchUpInside(_ sender: Any) {
        dismiss(animated: true, completion: nil)
    }

    @IBAction func saveButton_TouchUpInside(_ sender: Any) {

    }

    override var prefersStatusBarHidden: Bool {
        return true
    }

}

我没有在AppDelegate内更改或添加任何代码。这是在XCODE 9和Swift 4中提供的。谢谢您的帮助。

Answer 1

您的代码很好，您只是忘记在info.plist文件中询问对摄像机使用的许可，请添加此“隐私-摄像机使用说明”

Answer 2

如果您已经更新了.plist文件，则应检查“相机使用权限”。

func checkPermissions() {
    let authStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)

    switch authStatus {
    case .authorized:
        setupCamera()
    case .denied:
        alertPromptToAllowCameraAccessViaSetting()
    default:
        // Not determined fill fall here - after first use, when is't neither authorized, nor denied
        // we try to use camera, because system will ask itself for camera permissions
        setupCamera()
    }
}

func alertPromptToAllowCameraAccessViaSetting() {
    let alert = UIAlertController(title: "Error", message: "Camera access required to...", preferredStyle: UIAlertControllerStyle.alert)

    alert.addAction(UIAlertAction(title: "Cancel", style: .default))
    alert.addAction(UIAlertAction(title: "Settings", style: .cancel) { (alert) -> Void in
        UIApplication.shared.openURL(URL(string: UIApplicationOpenSettingsURLString)!)
    })

    present(alert, animated: true)
}

制作自定义相机，我的应用程序委托中出现“线程1：信号SIGBRT”错误

2 个答案: