我是 Swift 的新手，我没有太多的编程练习，所以也许这个问题对你来说很容易解决 O:-)...
我只需要一个带有 AVFoundation 的简单相机来拍摄照片，不需要实时模式或视频录制。 我对视频方向有疑问，目前无法在论坛中找到答案。我知道很多人都有这个问题，但我尝试的所有方法都没有用，我无法在我的代码中解决这个问题。我真的不明白用 AVFoundation 捕获图片是如何工作的以及图片的确切拍摄位置......
你能告诉我如何为图片设置设备图像方向，以便在 ImageView 中使用图片时它会以设备方向显示吗？
这是我的代码:
import UIKit
import AVFoundation
import Photos
class ViewController: UIViewController {
@IBOutlet weak var cameraView: UIView!
@IBOutlet weak var imageProcessedView: UIImageView!
var imageProcessed: UIImage?
let captureSession = AVCaptureSession()
var captureDevice: AVCaptureDevice?
var previewLayer: AVCaptureVideoPreviewLayer?
var stillImageOutput: AVCaptureStillImageOutput = AVCaptureStillImageOutput()
override func viewDidLoad() {
super.viewDidLoad()
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
imageProcessedView.alpha = 1.0
captureSession.sessionPreset = AVCaptureSessionPresetPhoto
backCamera()
}
func backCamera()
{
let devices = AVCaptureDevice.devices()
for device in devices! {
if ((device as AnyObject).hasMediaType(AVMediaTypeVideo)){
captureDevice = device as? AVCaptureDevice
do {
try captureSession.addInput(AVCaptureDeviceInput(device: captureDevice))
} catch {
print("error")
}
break
}
}
}
//Session starts and preview appears:
@IBAction func takePhoto(_ sender: Any) {
if captureDevice != nil
{
imageProcessedView.alpha = 0.0
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
self.cameraView.layer.addSublayer(previewLayer!)
previewLayer?.frame = self.cameraView.layer.bounds
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput){
captureSession.addOutput(stillImageOutput)
}
}else{
print("No captureDevice")
}
}
@IBAction func capturePicture(_ sender: Any) {
if let videoConnection = stillImageOutput.connection(withMediaType: AVMediaTypeVideo){
var currentDevice: UIDevice
currentDevice = .current
var deviceOrientation: UIDeviceOrientation
deviceOrientation = currentDevice.orientation
//variables to set the orientation as parameter like "portrait" and as rawValue like the integer 0 for portrait mode
var avCaptureOrientation: AVCaptureVideoOrientation
avCaptureOrientation = .portrait
var orientationValue: Int
orientationValue = 0
if deviceOrientation == .portrait {
avCaptureOrientation = .portrait
orientationValue = 0
print("Device: Portrait")
}else if (deviceOrientation == .landscapeLeft){
avCaptureOrientation = .landscapeLeft
orientationValue = 3
print("Device: LandscapeLeft")
}else if (deviceOrientation == .landscapeRight){
avCaptureOrientation = .landscapeRight
orientationValue = 2
print("Device LandscapeRight")
}else if (deviceOrientation == .portraitUpsideDown){
avCaptureOrientation = .portraitUpsideDown
orientationValue = 1
print("Device PortraitUpsideDown")
}else{
print("Unknown Device Orientation")
}
stillImageOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: {(imageDataSampleBuffer, error) in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
let image = UIImage(data: imageData!)
self.imageProcessed = image!
//In this print command always "3" appears
print("Metadata Orientation: \(image!.imageOrientation.rawValue)")
//in this view the orientation is correct but later when I use the picture to display it in an imageView it is wrong
self.cameraView.backgroundColor = UIColor(patternImage: image!)
self.captureSession.stopRunning()
})
}
}
非常感谢!!!
码头
好的，现在我稍微更改了我的代码。我可以看到正确的 DeviceOrientation，并且 imageOrientation 似乎也是正确的，如打印命令中所示。
但我仍然有问题，当我将图片放入 imageView 时，图片的方向是错误的(它也缩放得太大了)。
我想把图片设置到image view中的函数是:
@IBAction func showCirclesInPic(_ sender: Any) {
if imageProcessed != nil {
previewLayer!.removeFromSuperlayer()
cameraView.addSubview(imageProcessedView)
if (imageProcessed!.imageOrientation != .up){
UIGraphicsBeginImageContextWithOptions(imageProcessed!.size, false, imageProcessed!.scale)
imageProcessed!.draw(in: CGRect(x:0, y:0, width: imageProcessed!.size.width, height: imageProcessed!.size.height))
imageProcessed = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
}
imageProcessedView.contentMode = .scaleAspectFit
imageProcessedView.image = imageProcessed
//print("ImageProcessed: \(ImageProcessingCV.showCircles(imageProcessed)!)")
}
}
这是我更改后的代码的其余部分:
import UIKit
import AVFoundation
import Photos
class ViewController: UIViewController {
@IBOutlet weak var cameraView: UIView!
@IBOutlet weak var imageProcessedView: UIImageView!
var imageProcessed: UIImage?
let captureSession = AVCaptureSession()
var captureDevice: AVCaptureDevice?
var previewLayer: AVCaptureVideoPreviewLayer?
var stillImageOutput: AVCaptureStillImageOutput = AVCaptureStillImageOutput()
override func viewDidLoad() {
super.viewDidLoad()
imageProcessedView.alpha = 1.0
captureSession.sessionPreset = AVCaptureSessionPresetPhoto
backCamera()
}
func backCamera()
{
let devices = AVCaptureDevice.devices()
for device in devices! {
if ((device as AnyObject).hasMediaType(AVMediaTypeVideo)){
captureDevice = device as? AVCaptureDevice
do {
try captureSession.addInput(AVCaptureDeviceInput(device: captureDevice))
} catch {
print("error")
}
break
}
}
}
@IBAction func takePhoto(_ sender: Any) {
if captureDevice != nil
{
imageProcessedView.alpha = 0.0
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
self.cameraView.layer.addSublayer(previewLayer!)
previewLayer?.frame = self.cameraView.layer.bounds
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
captureSession.startRunning()
stillImageOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if captureSession.canAddOutput(stillImageOutput){
captureSession.addOutput(stillImageOutput)
}
}else{
print("No captureDevice")
}
}
@IBAction func capturePicture(_ sender: Any) {
if let videoConnection = stillImageOutput.connection(withMediaType: AVMediaTypeVideo){
var currentDevice: UIDevice
currentDevice = .current
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
var deviceOrientation: UIDeviceOrientation
deviceOrientation = currentDevice.orientation
var imageOrientation: UIImageOrientation?
if deviceOrientation == .portrait {
imageOrientation = .up
print("Device: Portrait")
}else if (deviceOrientation == .landscapeLeft){
imageOrientation = .left
print("Device: LandscapeLeft")
}else if (deviceOrientation == .landscapeRight){
imageOrientation = .right
print("Device LandscapeRight")
}else if (deviceOrientation == .portraitUpsideDown){
imageOrientation = .down
print("Device PortraitUpsideDown")
}else{
print("Unknown Device Orientation")
}
stillImageOutput.captureStillImageAsynchronously(from: videoConnection, completionHandler: {(imageDataSampleBuffer, error) in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
let dataProvider = CGDataProvider(data: imageData! as CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent )
self.imageProcessed = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: imageOrientation!)
//print("Image Orientation: \(self.imageProcessed?.imageOrientation.rawValue)")
print("ImageO: \(imageOrientation!.rawValue)")
self.cameraView.backgroundColor = UIColor(patternImage: self.imageProcessed!)
self.captureSession.stopRunning()
})
}
}
@IBAction func focusAndExposeTap(_ gestureRecognizer: UITapGestureRecognizer) {
let devicePoint = self.previewLayer?.captureDevicePointOfInterest(for: gestureRecognizer.location(in: gestureRecognizer.view))
focus(with: .autoFocus, exposureMode: .autoExpose, at: devicePoint!, monitorSubjectAreaChange: true)
}
private func focus(with focusMode: AVCaptureFocusMode, exposureMode: AVCaptureExposureMode, at devicePoint: CGPoint, monitorSubjectAreaChange: Bool)
{
if let device = captureDevice
{
do{
try device.lockForConfiguration()
if device.isFocusPointOfInterestSupported && device.isFocusModeSupported(focusMode)
{
device.focusPointOfInterest = devicePoint
device.focusMode = focusMode
}
if device.isExposurePointOfInterestSupported && device.isExposureModeSupported(exposureMode)
{
device.exposurePointOfInterest = devicePoint
device.exposureMode = exposureMode
}
device.isSubjectAreaChangeMonitoringEnabled = monitorSubjectAreaChange
device.unlockForConfiguration()
}catch{
print("Could not lock device for configuration: \(error)")
}
}
}
@IBAction func showCirclesInPic(_ sender: Any) {
if imageProcessed != nil {
previewLayer!.removeFromSuperlayer()
cameraView.addSubview(imageProcessedView)
if (imageProcessed!.imageOrientation != .up){
UIGraphicsBeginImageContextWithOptions(imageProcessed!.size, false, imageProcessed!.scale)
imageProcessed!.draw(in: CGRect(x:0, y:0, width: imageProcessed!.size.width, height: imageProcessed!.size.height))
imageProcessed = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
}
imageProcessedView.contentMode = .scaleAspectFit
imageProcessedView.image = imageProcessed
//print("ImageProcessed: \(ImageProcessingCV.showCircles(imageProcessed)!)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
最佳答案
为了在拍照时更改相机输出的方向，您应该使用 NotificationCenter 添加方向更改的监听器。我将附上您可能使用的使用 AVFoundation 的相机示例代码。
请注意，捕获和翻转相机是通过编程方式添加的。更重要的是，您可以为翻转摄像头设置图像(有注释告诉您在哪里设置)。
代码修复
//
// CameraViewController.swift
// MatchFriend
//
// Created by Tarek Ezzat Abdallah on 10/1/16.
// Copyright © 2016 Tarek. All rights reserved.
//
import UIKit
import AVFoundation
class CameraViewController: UIViewController{
var captureSession: AVCaptureSession?
var previewLayer : AVCaptureVideoPreviewLayer?
var stillImageOutput: AVCaptureStillImageOutput?
var imageToSend: UIImage!
// If we find a device we'll store it here for later use
var captureDevice : AVCaptureDevice?
@IBOutlet weak var cameraView: UIView!
var captureButton: UIButton!
var flipCam:UIButton!
var camPos:String = "back"
func capture(_ sender: AnyObject)
{
if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo)
{
stillImageOutput?.captureStillImageAsynchronously(from: videoConnection)
{
(imageDataSampleBuffer, error) -> Void in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
let dataProvider = CGDataProvider(data: imageData as! CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent )
let image = UIImage(cgImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.right)
}
}
}
override func viewDidLoad()
{
super.viewDidLoad()
cameraView.backgroundColor = .clear
self.view.backgroundColor = .clear
captureButton = UIButton(frame: CGRect(x: 160, y: 580, width: 80, height: 80))
captureButton.addTarget(self, action: #selector(CameraViewController.capture(_:)), for: UIControlEvents.touchUpInside)
flipCam = UIButton(frame: CGRect(x: 0, y: 0, width: 40, height: 40))
flipCam.addTarget(self, action: #selector(CameraViewController.flip), for: UIControlEvents.touchUpInside)
self.view.addSubview(captureButton)
self.view.addSubview(flipCam)
captureButton.backgroundColor = UIColor.red
NotificationCenter.default.addObserver(self, selector: #selector(CameraViewController.rotated), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)
// let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
camStart(camPos)
setViews()
}
func camStart(_ position: String)
{
captureSession = AVCaptureSession()
captureSession?.sessionPreset = AVCaptureSessionPresetHigh
let videoDevices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo)
var capDevice:AVCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
if(position == "back")
{
for device in videoDevices!
{
let device = device as! AVCaptureDevice
if device.position == AVCaptureDevicePosition.back
{
capDevice = device
break
}
}
}
else{
for device in videoDevices!
{
let device = device as! AVCaptureDevice
if device.position == AVCaptureDevicePosition.front
{
capDevice = device
break
}
}
}
// var error : NSError?
let input = try? AVCaptureDeviceInput(device: capDevice)
if (captureSession?.canAddInput(input) != nil){
captureSession?.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput?.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]
if (captureSession?.canAddOutput(stillImageOutput) != nil){
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
previewLayer!.frame = self.view.layer.frame
previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
cameraView.layer.addSublayer(previewLayer!)
captureSession?.startRunning()
}
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
captureButton.frame = CGRect(x: self.view.frame.width/2 - 40, y: self.view.frame.height - 70 - 40, width: 80, height: 80)
flipCam.frame = CGRect(x: self.view.frame.width/6 - 40, y: self.view.frame.height - 60 - 40, width: 80, height: 80)
//add the image to flip camera
//flipCam.setImage(UIImage(named: "switchCam"), for: UIControlState.normal)
flipCam.setTitle("flip", for: .normal)
if previewLayer != nil{
previewLayer!.frame = self.view.frame
}
}
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(true)
setViews()
}
override func didReceiveMemoryWarning()
{
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setViews()
{
captureButton.layer.cornerRadius = captureButton.layer.bounds.width/2
captureButton.layer.borderWidth = 1
}
func configureDevice()
{
let error: NSErrorPointer? = nil
if let device = captureDevice {
do {
try captureDevice!.lockForConfiguration()
} catch let error1 as NSError
{
error??.pointee = error1
}
device.focusMode = .locked
device.unlockForConfiguration()
}
}
func flip()
{
captureSession?.stopRunning()
if camPos == "back"
{
camPos = "front"
}
else{
camPos = "back"
}
camStart(camPos)
}
func rotated() {
if UIDeviceOrientationIsLandscape(UIDevice.current.orientation) {
if UIDevice.current.orientation == UIDeviceOrientation.landscapeLeft{
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.landscapeRight
}
else
{
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.landscapeLeft
}
}
if UIDeviceOrientationIsPortrait(UIDevice.current.orientation) {
if UIDevice.current.orientation == UIDeviceOrientation.portrait{
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portrait
}
else
{
previewLayer?.connection.videoOrientation = AVCaptureVideoOrientation.portraitUpsideDown
}
}
}
}
关于ios - 在 Swift 3 中使用 AVFoundation 设置图片方向，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44395488/