我已经看到了这个问题的其他几乎答案，但似乎无法让它发挥作用。我从AVMediaTypeVideo捕获图像，它的方向始终是UIImageOrientation 3（我不知道这实际意味着什么）。
我已尝试使用状态栏方向进行更正，但似乎没有任何效果。我不需要将这些图像保存到相机胶卷，它现在就在那里进行验证。我不确定这是否对方向有任何影响。
import UIKit
import AVFoundation
class ViewController: UIViewController {
let captureSession = AVCaptureSession()
let stillImageOutput = AVCaptureStillImageOutput()
var avCaptureVideoPreview : AVCaptureVideoPreviewLayer?
var error: NSError?
override func viewDidLoad() {
super.viewDidLoad()
let devices = AVCaptureDevice.devices().filter{ $0.hasMediaType(AVMediaTypeVideo) }
if let captureDevice = devices.first as? AVCaptureDevice {
captureSession.addInput(AVCaptureDeviceInput(device: captureDevice, error: &error))
captureSession.sessionPreset = AVCaptureSessionPresetMedium
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
avCaptureVideoPreview = AVCaptureVideoPreviewLayer(session: captureSession)
if let previewLayer = avCaptureVideoPreview {
previewLayer.bounds = CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height)
previewLayer.position = CGPointMake(view.bounds.midX, view.bounds.midY)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
let cameraPreview = UIView(frame: CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height))
cameraPreview.layer.addSublayer(previewLayer)
cameraPreview.addGestureRecognizer(UITapGestureRecognizer(target: self, action:"saveToCamera:"))
view.addSubview(cameraPreview)
}
}
// Add a selfie button if device is capable
for device in devices {
if device.position == AVCaptureDevicePosition.Front {
// Add selfie button
println("selfie capable")
}
}
}
override func viewWillLayoutSubviews() {
if avCaptureVideoPreview != nil {
// Orientation
if (avCaptureVideoPreview!.connection.supportsVideoOrientation == true) {
avCaptureVideoPreview!.connection.videoOrientation = interfaceOrientationToVideoOrientation(UIApplication.sharedApplication().statusBarOrientation)
}
// Frame
avCaptureVideoPreview!.bounds = CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height)
avCaptureVideoPreview!.position = CGPointMake(view.bounds.midX, view.bounds.midY)
avCaptureVideoPreview!.videoGravity = AVLayerVideoGravityResizeAspectFill
}
}
func interfaceOrientationToVideoOrientation(orientation: UIInterfaceOrientation) -> AVCaptureVideoOrientation {
switch orientation {
case UIInterfaceOrientation.Portrait:
return AVCaptureVideoOrientation.Portrait
case UIInterfaceOrientation.PortraitUpsideDown:
return AVCaptureVideoOrientation.PortraitUpsideDown
case UIInterfaceOrientation.LandscapeLeft:
return AVCaptureVideoOrientation.LandscapeLeft
case UIInterfaceOrientation.LandscapeRight:
return AVCaptureVideoOrientation.LandscapeRight
default:
return AVCaptureVideoOrientation.Portrait
}
}
func saveToCamera(sender: UITapGestureRecognizer) {
if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {
stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
(imageDataSampleBuffer, error) -> Void in
var image = UIImage(data: AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer))
// this is not working
var orientation : UIImageOrientation?
switch UIApplication.sharedApplication().statusBarOrientation.rawValue {
case 1:
orientation = UIImageOrientation.Up
case 3:
orientation = UIImageOrientation.Left
case 4:
orientation = UIImageOrientation.Right
default:
orientation = UIImageOrientation.Up
}
let newImage = UIImage(CGImage: image?.CGImage, scale: 1.0, orientation: orientation!)
UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
答案 0 :(得分：3)
编辑，这不适用于使用前置摄像头拍摄的照片，它们在原生照片应用程序中显示正常，但在Mac上的照片中共享或从parse.com加载时不能显示。
感谢@XJones在这里的回答Why does AVCaptureVideoOrientation landscape modes result in upside down still images?
import UIKit
import AVFoundation
class ViewController: UIViewController {
let captureSession = AVCaptureSession()
let stillImageOutput = AVCaptureStillImageOutput()
var avCaptureVideoPreview : AVCaptureVideoPreviewLayer?
var error: NSError?
override func viewDidLoad() {
super.viewDidLoad()
let devices = AVCaptureDevice.devices().filter{ $0.hasMediaType(AVMediaTypeVideo) }
if let captureDevice = devices.first as? AVCaptureDevice {
captureSession.addInput(AVCaptureDeviceInput(device: captureDevice, error: &error))
captureSession.sessionPreset = AVCaptureSessionPresetMedium
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput) {
captureSession.addOutput(stillImageOutput)
}
avCaptureVideoPreview = AVCaptureVideoPreviewLayer(session: captureSession)
if let previewLayer = avCaptureVideoPreview {
previewLayer.bounds = CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height)
previewLayer.position = CGPointMake(view.bounds.midX, view.bounds.midY)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
let cameraPreview = UIView(frame: CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height))
cameraPreview.layer.addSublayer(previewLayer)
cameraPreview.addGestureRecognizer(UITapGestureRecognizer(target: self, action:"saveToCamera:"))
view.addSubview(cameraPreview)
}
}
// Add a selfie button if device is capable
for device in devices {
if device.position == AVCaptureDevicePosition.Front {
// Add selfie button
println("selfie capable")
}
}
}
override func viewWillLayoutSubviews() {
if avCaptureVideoPreview != nil {
// Orientation
if (avCaptureVideoPreview!.connection.supportsVideoOrientation == true) {
var newOrientation : AVCaptureVideoOrientation?
switch UIDevice.currentDevice().orientation {
case UIDeviceOrientation.Portrait:
newOrientation = AVCaptureVideoOrientation.Portrait
case UIDeviceOrientation.PortraitUpsideDown:
newOrientation = AVCaptureVideoOrientation.PortraitUpsideDown
case UIDeviceOrientation.LandscapeLeft:
newOrientation = AVCaptureVideoOrientation.LandscapeRight;
case UIDeviceOrientation.LandscapeRight:
newOrientation = AVCaptureVideoOrientation.LandscapeLeft
default:
newOrientation = AVCaptureVideoOrientation.Portrait
}
avCaptureVideoPreview!.connection.videoOrientation = newOrientation!
}
// Frame
avCaptureVideoPreview!.bounds = CGRectMake(0.0, 0.0, view.bounds.size.width, view.bounds.size.height)
avCaptureVideoPreview!.position = CGPointMake(view.bounds.midX, view.bounds.midY)
avCaptureVideoPreview!.videoGravity = AVLayerVideoGravityResizeAspectFill
}
}
func saveToCamera(sender: UITapGestureRecognizer) {
if let videoConnection = stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) {
stillImageOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
(imageDataSampleBuffer, error) -> Void in
var image = UIImage(data: AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer))
var imageOrientation : UIImageOrientation?
switch UIDevice.currentDevice().orientation {
case UIDeviceOrientation.PortraitUpsideDown:
imageOrientation = UIImageOrientation.Left
case UIDeviceOrientation.LandscapeRight:
imageOrientation = UIImageOrientation.Down
case UIDeviceOrientation.LandscapeLeft:
imageOrientation = UIImageOrientation.Up
case UIDeviceOrientation.Portrait:
imageOrientation = UIImageOrientation.Right
default:
imageOrientation = UIImageOrientation.Right
}
var newImage = UIImage(CGImage: image!.CGImage, scale: 1.0, orientation: imageOrientation!)
UIImageWriteToSavedPhotosAlbum(newImage!, nil, nil, nil)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}