在定制相机(Swift)期间，App正在悄然崩溃。

Question

这个应用程序在这个函数中随机点崩溃。我认为我需要缩小规模，但我不确定。我对图像的唯一要求是，它保持一个正方形，并且保持体面的大小，因为我需要它足够大，以获得整个屏幕的宽度。

这里有一个错误，有时伴随着崩溃：

警告:无法加载任何目标-C类信息。这将大大降低现有类型信息的质量。

@IBAction func didPressTakePhoto(sender: UIButton) {
    self.previewLayer?.connection.enabled = false
    if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {
        videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {(sampleBuffer, error) in
            if (sampleBuffer != nil) {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let dataProvider = CGDataProviderCreateWithCFData(imageData)
                let cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, CGColorRenderingIntent.RenderingIntentDefault)
                var image = UIImage()

                if UIDevice.currentDevice().orientation == .Portrait{
                    image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
                }else if UIDevice.currentDevice().orientation == .LandscapeLeft{
                    image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Up)
                }else if UIDevice.currentDevice().orientation == .LandscapeRight{
                    image = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Down)
                }

                //Crop the image to a square
                let imageSize: CGSize = image.size
                let width: CGFloat = imageSize.width
                let height: CGFloat = imageSize.height
                if width != height {
                    let newDimension: CGFloat = min(width, height)
                    let widthOffset: CGFloat = (width - newDimension) / 2
                    let heightOffset: CGFloat = (height - newDimension) / 2
                    UIGraphicsBeginImageContextWithOptions(CGSizeMake(newDimension, newDimension), false, 0.0)
                    image.drawAtPoint(CGPointMake(-widthOffset, -heightOffset), blendMode: .Copy, alpha: 1.0)
                    image = UIGraphicsGetImageFromCurrentImageContext()
                    let imageData: NSData = UIImageJPEGRepresentation(image, 0.1)!
                    UIGraphicsEndImageContext()
                    self.captImage = UIImage(data: imageData)!
                }

            }
            self.performSegueWithIdentifier("fromCustomCamera", sender: self)
        })

    }


}

这段代码在我的viewDidAppear中运行，当我拍照时，stillImageOutput返回零。

if self.isRunning == false{
        captureSession = AVCaptureSession()
        captureSession!.sessionPreset = AVCaptureSessionPresetPhoto

        let backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)

        var error: NSError?

        do {
            input = try AVCaptureDeviceInput(device: backCamera)
        } catch let error1 as NSError {
            error = error1
            print(error)
            input = nil
        }

        if error == nil && captureSession!.canAddInput(input) {
            captureSession!.addInput(input)
            stillImageOutput = AVCaptureStillImageOutput()
            stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
            if captureSession!.canAddOutput(stillImageOutput) {
                captureSession!.addOutput(stillImageOutput)
                previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
                previewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.Portrait
                previewView.layer.addSublayer(previewLayer!)

                captureSession!.startRunning()
                self.isRunning = true



            }
        }

    }

Answer 1

修好了。它崩溃的原因实际上是因为我的图像太大了。我得把它们压缩。