为什么我的照片会变得更大？，Swift，iOS

Question

我正在使用AVFoundation拍照，但是当我拍照时，回来的照片比我拍的照片更大。

有谁知道为什么会这样？

我让相机处于横向模式。

下面是我拍摄图像然后将其分配给新变量的代码。

    var cropArea:CGRect{
    get{
        let factor = backImage.image!.size.width/view.frame.width
        let scale = CGFloat(1)
        let imageFrame = viewFinder.imageFrame()
        let x = (cropAreaView.frame.origin.x - imageFrame.origin.x) * scale * factor
        let y = (cropAreaView.frame.origin.y - imageFrame.origin.y) * scale * factor
        let width = cropAreaView.frame.size.width * scale * factor
        let height = cropAreaView.frame.size.height * scale  * factor
        return CGRect(x: x, y: y, width: width, height: height)
    }
}

func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
    if let imageData = photo.fileDataRepresentation() {
        print(imageData)

        image = UIImage(data: imageData)

        backImage.image = image


        let croppedCGImage = self.backImage.image?.cgImage?.cropping(to: self.cropArea)
        let croppedImage = UIImage(cgImage: croppedCGImage!)

        self.pictureView.image = croppedImage