ios - 制作自定义相机，在我的应用程序委托(delegate)中收到 "Thread 1: signal SIGBRT"错误

Question

我正在制作一个定制相机。我有 2 个用于相机的 View Controller (一个用于实际捕获，另一个用于照片预览)。这是每个代码，我已经检查过但没有发现任何错误!我的 XCODE 项目是启用了 CoreData 的单一 View 。编辑:我已经添加了适当的 Info.Plist 相机权限。

下面是我用于拍照的 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)
        }
    }


}

这是我的预览代码，当我按下用户刚刚捕获的“取消”或“保存”按钮时，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 中更改或添加任何代码。这是 XCODE 9 和 Swift 4 中的内容。感谢您的帮助。

Answer 1

您的代码没问题，只是忘记在 info.plist 文件中请求相机使用权限，添加此“隐私 - 相机使用说明”