Question

我在Swift3中构建了一个相机应用程序。当我尝试在iPhone上运行我的应用程序时，它会显示以下错误。不知道为什么或做什么。

    import UIKit
    import AVFoundation

class ViewController: UIViewController {

    @IBOutlet weak var previewView:UIView!

    var session = AVCaptureSession()
    var photoOutput = AVCapturePhotoOutput()

    let notification = NotificationCenter.default

    override func viewDidLoad() {
        super.viewDidLoad()

        if session.isRunning {
            return
        }

    setupInputOutput()

    setPreviewLayer()

    session.startRunning()
        notification.addObserver(self,
                                 selector: #selector(self.changedDeviceOrientation(_:)),
                                 name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
    }

    @IBAction func takePhoto(_ sender: AnyObject) {
        let captureSetting = AVCapturePhotoSettings()
        captureSetting.flashMode = .auto
        captureSetting.isAutoStillImageStabilizationEnabled = true
        captureSetting.isHighResolutionPhotoEnabled = false

        photoOutput.capturePhoto(with: captureSetting, delegate: self)
    }



    func setupInputOutput(){

        session.sessionPreset = AVCaptureSessionPresetPhoto



        do {

            let device = AVCaptureDevice.defaultDevice(
                withDeviceType: AVCaptureDeviceType.builtInWideAngleCamera,
                mediaType: AVMediaTypeVideo,
                position: .back)

            let input = try AVCaptureDeviceInput(device: device)
            if session.canAddInput(input){
                session.addInput(input)
            }else {
                print("セッションに入力を追加できなかった")
                return
            }
        } catch let error as NSError {
            print("カメラがない\(error)")
            return
        }


        if session.canAddOutput(photoOutput) {
            session.addOutput(photoOutput)
        } else {
            print("セッションに出力をできなかった")
            return
        }
    }


    func setPreviewLayer(){

        let previewLayer = AVCaptureVideoPreviewLayer(session: session)
        guard let videoLayer = previewLayer else {
            print("プレビューレイヤーを作れなかった")
            return
        }
        videoLayer.frame = view.bounds
        videoLayer.masksToBounds = true
        videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        //previewViewに追加する
        previewView.layer.addSublayer(videoLayer)
    }


    func changedDeviceOrientation(_ notification :Notification) {

        if let photoOutputConnection = self.photoOutput.connection(withMediaType: AVMediaTypeVideo) {
            switch UIDevice.current.orientation {
            case .portrait:
                photoOutputConnection.videoOrientation = .portrait
            case .portraitUpsideDown:
                photoOutputConnection.videoOrientation = .portraitUpsideDown
            case .landscapeLeft:
                photoOutputConnection.videoOrientation = .landscapeRight
            case .landscapeRight:
                photoOutputConnection.videoOrientation = .landscapeLeft
            default:
                break
            }
        }
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

它无法运行。当我尝试运行时，＆＃34; ETC_BREAKPOINT（代码= 1，子代码= 0x1002b51fc＆＃34;出现。没有代码错误。

Answer 1

向您添加uncaughtExceptionHandler应用委托并打印出堆栈有关详情，请参阅此帖子：Register UncaughtExceptionHandler in Objective C using NSSetUncaughtExceptionHandler

如果你知道异常的位置

，你也可以添加一个try-catch-finally块

iOS应用中的例外情况。不知道从哪里开始调试这个

1 个答案: