如何将相机设置为横向模式？每次我拍照时，图像都会保存为肖像图像。当设备处于横向模式时，照片看起来不错，但如果我在相机胶卷中看到它，它仍然是纵向模式。 这是我的拍照功能:

// take a photo
@IBAction func takePhoto(sender: AnyObject) {
self.fullScreenView.hidden = false
self.recordButton.enabled = false
self.takephoto.enabled = false
self.recordButton.hidden = true
self.takephoto.hidden = true

session.startRunning()

// customize the quality level or bitrate of the output photo
session.sessionPreset = AVCaptureSessionPresetPhoto

// add the AVCaptureVideoPreviewLayer to the view and set the view in fullscreen
fullScreenView.frame = view.bounds
videoPreviewLayer.frame = fullScreenView.bounds
fullScreenView.layer.addSublayer(videoPreviewLayer)

// add action to fullScreenView
gestureFullScreenView = UITapGestureRecognizer(target: self, action: #selector(ViewController.takePhoto(_:)))
self.fullScreenView.addGestureRecognizer(gestureFullScreenView)

// add action to myView
gestureView = UITapGestureRecognizer(target: self, action: #selector(ViewController.setFrontpage(_:)))
self.view.addGestureRecognizer(gestureView)

if (preview == true) {
    if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {
        // code for photo capture goes here...

        stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: { (sampleBuffer, error) -> Void in
            // process the image data (sampleBuffer) here to get an image file we can put in our view

            if (sampleBuffer != nil) {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let image = UIImage(data: imageData, scale: 1.0)

                self.fullScreenView.hidden = true
                self.fullScreenView.gestureRecognizers?.forEach(self.fullScreenView.removeGestureRecognizer)
                self.session.stopRunning()

                // save image to the library
                UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)

                self.imageViewBackground = UIImageView(frame: self.view.bounds)
                self.imageViewBackground.image = image
                self.imageViewBackground.tag = self.key

                self.view.addSubview(self.imageViewBackground)
            }
        })
    }
}
else {
    preview = true
}
}

我的预览看起来像这样，没关系:

http://img5.fotos-hochladen.net/uploads/bildschirmfotom4s7diaehy.png

但最后看起来是这样的:

http://img5.fotos-hochladen.net/uploads/bildschirmfoto3c2rlwtevf.png

提前致谢!

最佳答案

因为无论您的设备是纵向还是横向，您的videoConnection 的方向 始终是纵向的。所以你应该在拍摄静态照片之前将 videoConnection 的方向调整到正确的方向

添加以下方法获取当前设备方向的videoOrientation

func videoOrientation(for deviceOrientation: UIDeviceOrientation) -> AVCaptureVideoOrientation {
    switch deviceOrientation {
    case UIDeviceOrientation.portrait:
        return AVCaptureVideoOrientation.portrait
    case UIDeviceOrientation.landscapeLeft:
        return AVCaptureVideoOrientation.landscapeRight
    case UIDeviceOrientation.landscapeRight:
        return AVCaptureVideoOrientation.landscapeLeft
    case UIDeviceOrientation.portraitUpsideDown:
        return AVCaptureVideoOrientation.portraitUpsideDown
    default:
        return AVCaptureVideoOrientation.portrait
    }
}

在下一行之后

if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {

添加以下行

videoConnection.videoOrientation = videoOrientation(for: UIDevice.current.orientation)

注意:如果您的应用仅支持纵向或横向模式，此问题仍然会发生，因为 UIDevice.current.orientation 将始终返回支持的方向。为了克服这个问题，您可以使用 CoreMotion 检测设备方向，然后将其传递给 videoOrientation(for:) 方法。

希望这有帮助:)

关于ios - 相机仅以人像模式快速拍照，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38720553/