How to switch camera using AVFoundation
I have implemented the preview camera using AVFoundation, its working fine. But I have a hard time to switch the camera back and front. I have added a switch button at the bottom bar. By default, its the back camera, I want to switch it to front. How can I do that?
class FifteenSecsViewController: UIViewController, AVCaptureFileOutputRecordingDelegate {
@IBOutlet weak var camPreview: UIView!
let captureSession = AVCaptureSession()
let movieOutput = AVCaptureMovieFileOutput()
var previewLayer: AVCaptureVideoPreviewLayer!
var activeInput: AVCaptureDeviceInput!
var outputURL: URL!
override func viewDidLoad() {
super.viewDidLoad()
if setupSession() {
setupPreview()
startSession()
}
self.switchCameraButton.addTarget(self, action: #selector(switchButtonTapped), for: .touchUpInside)
}
func setupSession() -> Bool {
captureSession.sessionPreset = AVCaptureSession.Preset.high
// Setup Camera
let camera: AVCaptureDevice?
camera = AVCaptureDevice.default(for: .video)
do {
let input = try AVCaptureDeviceInput(device: camera!)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
activeInput = input
}
} catch {
print("Error setting device video input: (error)")
return false
}
// Setup Microphone
let microphone = AVCaptureDevice.default(for: .audio)
do {
let micInput = try AVCaptureDeviceInput(device: microphone!)
if captureSession.canAddInput(micInput) {
captureSession.addInput(micInput)
}
} catch {
print("Error setting device audio input: (error)")
return false
}
// Movie output
let seconds : Int64 = 3
let maxDuration = CMTime(seconds: Double(seconds),
preferredTimescale: 1)
movieOutput.maxRecordedDuration = maxDuration
if captureSession.canAddOutput(movieOutput) {
captureSession.addOutput(movieOutput)
}
return true
}
func setupPreview() {
// Configure previewLayer
previewLayer = AVCaptureVideoPreviewLayer(session:
captureSession)
previewLayer.frame = camPreview.bounds
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
camPreview.layer.addSublayer(previewLayer)
}
//MARK:- Camera Session
func startSession() {
if !captureSession.isRunning {
videoQueue().async {
self.captureSession.startRunning()
}
}
}
@objc func switchButtonTapped(){
// what to write here??
}
}
Function switchButtonTapped
is an actionTarget of UIButton. If I add this code in this button:
@objc func switchButtonTapped(){
if setupSession() {
setupPreview()
startSession()
}
}
Camerapreview
screen shows a white screen and got stuck.
ios swift avfoundation
add a comment |
I have implemented the preview camera using AVFoundation, its working fine. But I have a hard time to switch the camera back and front. I have added a switch button at the bottom bar. By default, its the back camera, I want to switch it to front. How can I do that?
class FifteenSecsViewController: UIViewController, AVCaptureFileOutputRecordingDelegate {
@IBOutlet weak var camPreview: UIView!
let captureSession = AVCaptureSession()
let movieOutput = AVCaptureMovieFileOutput()
var previewLayer: AVCaptureVideoPreviewLayer!
var activeInput: AVCaptureDeviceInput!
var outputURL: URL!
override func viewDidLoad() {
super.viewDidLoad()
if setupSession() {
setupPreview()
startSession()
}
self.switchCameraButton.addTarget(self, action: #selector(switchButtonTapped), for: .touchUpInside)
}
func setupSession() -> Bool {
captureSession.sessionPreset = AVCaptureSession.Preset.high
// Setup Camera
let camera: AVCaptureDevice?
camera = AVCaptureDevice.default(for: .video)
do {
let input = try AVCaptureDeviceInput(device: camera!)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
activeInput = input
}
} catch {
print("Error setting device video input: (error)")
return false
}
// Setup Microphone
let microphone = AVCaptureDevice.default(for: .audio)
do {
let micInput = try AVCaptureDeviceInput(device: microphone!)
if captureSession.canAddInput(micInput) {
captureSession.addInput(micInput)
}
} catch {
print("Error setting device audio input: (error)")
return false
}
// Movie output
let seconds : Int64 = 3
let maxDuration = CMTime(seconds: Double(seconds),
preferredTimescale: 1)
movieOutput.maxRecordedDuration = maxDuration
if captureSession.canAddOutput(movieOutput) {
captureSession.addOutput(movieOutput)
}
return true
}
func setupPreview() {
// Configure previewLayer
previewLayer = AVCaptureVideoPreviewLayer(session:
captureSession)
previewLayer.frame = camPreview.bounds
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
camPreview.layer.addSublayer(previewLayer)
}
//MARK:- Camera Session
func startSession() {
if !captureSession.isRunning {
videoQueue().async {
self.captureSession.startRunning()
}
}
}
@objc func switchButtonTapped(){
// what to write here??
}
}
Function switchButtonTapped
is an actionTarget of UIButton. If I add this code in this button:
@objc func switchButtonTapped(){
if setupSession() {
setupPreview()
startSession()
}
}
Camerapreview
screen shows a white screen and got stuck.
ios swift avfoundation
checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58
add a comment |
I have implemented the preview camera using AVFoundation, its working fine. But I have a hard time to switch the camera back and front. I have added a switch button at the bottom bar. By default, its the back camera, I want to switch it to front. How can I do that?
class FifteenSecsViewController: UIViewController, AVCaptureFileOutputRecordingDelegate {
@IBOutlet weak var camPreview: UIView!
let captureSession = AVCaptureSession()
let movieOutput = AVCaptureMovieFileOutput()
var previewLayer: AVCaptureVideoPreviewLayer!
var activeInput: AVCaptureDeviceInput!
var outputURL: URL!
override func viewDidLoad() {
super.viewDidLoad()
if setupSession() {
setupPreview()
startSession()
}
self.switchCameraButton.addTarget(self, action: #selector(switchButtonTapped), for: .touchUpInside)
}
func setupSession() -> Bool {
captureSession.sessionPreset = AVCaptureSession.Preset.high
// Setup Camera
let camera: AVCaptureDevice?
camera = AVCaptureDevice.default(for: .video)
do {
let input = try AVCaptureDeviceInput(device: camera!)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
activeInput = input
}
} catch {
print("Error setting device video input: (error)")
return false
}
// Setup Microphone
let microphone = AVCaptureDevice.default(for: .audio)
do {
let micInput = try AVCaptureDeviceInput(device: microphone!)
if captureSession.canAddInput(micInput) {
captureSession.addInput(micInput)
}
} catch {
print("Error setting device audio input: (error)")
return false
}
// Movie output
let seconds : Int64 = 3
let maxDuration = CMTime(seconds: Double(seconds),
preferredTimescale: 1)
movieOutput.maxRecordedDuration = maxDuration
if captureSession.canAddOutput(movieOutput) {
captureSession.addOutput(movieOutput)
}
return true
}
func setupPreview() {
// Configure previewLayer
previewLayer = AVCaptureVideoPreviewLayer(session:
captureSession)
previewLayer.frame = camPreview.bounds
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
camPreview.layer.addSublayer(previewLayer)
}
//MARK:- Camera Session
func startSession() {
if !captureSession.isRunning {
videoQueue().async {
self.captureSession.startRunning()
}
}
}
@objc func switchButtonTapped(){
// what to write here??
}
}
Function switchButtonTapped
is an actionTarget of UIButton. If I add this code in this button:
@objc func switchButtonTapped(){
if setupSession() {
setupPreview()
startSession()
}
}
Camerapreview
screen shows a white screen and got stuck.
ios swift avfoundation
I have implemented the preview camera using AVFoundation, its working fine. But I have a hard time to switch the camera back and front. I have added a switch button at the bottom bar. By default, its the back camera, I want to switch it to front. How can I do that?
class FifteenSecsViewController: UIViewController, AVCaptureFileOutputRecordingDelegate {
@IBOutlet weak var camPreview: UIView!
let captureSession = AVCaptureSession()
let movieOutput = AVCaptureMovieFileOutput()
var previewLayer: AVCaptureVideoPreviewLayer!
var activeInput: AVCaptureDeviceInput!
var outputURL: URL!
override func viewDidLoad() {
super.viewDidLoad()
if setupSession() {
setupPreview()
startSession()
}
self.switchCameraButton.addTarget(self, action: #selector(switchButtonTapped), for: .touchUpInside)
}
func setupSession() -> Bool {
captureSession.sessionPreset = AVCaptureSession.Preset.high
// Setup Camera
let camera: AVCaptureDevice?
camera = AVCaptureDevice.default(for: .video)
do {
let input = try AVCaptureDeviceInput(device: camera!)
if captureSession.canAddInput(input) {
captureSession.addInput(input)
activeInput = input
}
} catch {
print("Error setting device video input: (error)")
return false
}
// Setup Microphone
let microphone = AVCaptureDevice.default(for: .audio)
do {
let micInput = try AVCaptureDeviceInput(device: microphone!)
if captureSession.canAddInput(micInput) {
captureSession.addInput(micInput)
}
} catch {
print("Error setting device audio input: (error)")
return false
}
// Movie output
let seconds : Int64 = 3
let maxDuration = CMTime(seconds: Double(seconds),
preferredTimescale: 1)
movieOutput.maxRecordedDuration = maxDuration
if captureSession.canAddOutput(movieOutput) {
captureSession.addOutput(movieOutput)
}
return true
}
func setupPreview() {
// Configure previewLayer
previewLayer = AVCaptureVideoPreviewLayer(session:
captureSession)
previewLayer.frame = camPreview.bounds
previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
camPreview.layer.addSublayer(previewLayer)
}
//MARK:- Camera Session
func startSession() {
if !captureSession.isRunning {
videoQueue().async {
self.captureSession.startRunning()
}
}
}
@objc func switchButtonTapped(){
// what to write here??
}
}
Function switchButtonTapped
is an actionTarget of UIButton. If I add this code in this button:
@objc func switchButtonTapped(){
if setupSession() {
setupPreview()
startSession()
}
}
Camerapreview
screen shows a white screen and got stuck.
ios swift avfoundation
ios swift avfoundation
edited Jan 1 at 19:34
Yannick Loriot
6,34622850
6,34622850
asked Jan 1 at 11:32


Muneeb JanMuneeb Jan
154
154
checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58
add a comment |
checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58
checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58
add a comment |
2 Answers
2
active
oldest
votes
To begin create a device input for the front camera:
let frontDevice: AVCaptureDevice? = {
for device in AVCaptureDevice.devices(for: AVMediaType.video) {
if device.position == .front {
return device
}
}
return nil
}()
lazy var frontDeviceInput: AVCaptureDeviceInput? = {
if let _frontDevice = self.frontDevice {
return try? AVCaptureDeviceInput(device: _frontDevice)
}
return nil
}()
Then in your switchButtonTapped
, if there is a front camera you can do the switch between the front and the ones:
func switchButtonTapped() {
if let _frontDeviceInput = frontDeviceInput {
captureSession.beginConfiguration()
if let _currentInput = captureSession.inputs.first as? AVCaptureDeviceInput {
captureSession.removeInput(_currentInput)
let newDeviceInput = (_currentInput.device.position == .front) ? activeInput : _frontDeviceInput
captureSession.addInput(newDeviceInput!)
}
captureSession.commitConfiguration()
}
}
If you need more details, don't hesitate.
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add theactiveInput
elsewhere? You can check whether theactiveInput
is already present in thecaptureSession.inputs
and add/remove it accordingly.
– Yannick Loriot
Jan 2 at 15:54
add a comment |
Try this code:
func switchCamera() {
session?.beginConfiguration()
let currentInput = session?.inputs.first as? AVCaptureDeviceInput
session?.removeInput(currentInput!)
let newCameraDevice = currentInput?.device.position == .back ? getCamera(with: .front) : getCamera(with: .back)
let newVideoInput = try? AVCaptureDeviceInput(device: newCameraDevice!)
session?.addInput(newVideoInput!)
session?.commitConfiguration()
}
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
To begin create a device input for the front camera:
let frontDevice: AVCaptureDevice? = {
for device in AVCaptureDevice.devices(for: AVMediaType.video) {
if device.position == .front {
return device
}
}
return nil
}()
lazy var frontDeviceInput: AVCaptureDeviceInput? = {
if let _frontDevice = self.frontDevice {
return try? AVCaptureDeviceInput(device: _frontDevice)
}
return nil
}()
Then in your switchButtonTapped
, if there is a front camera you can do the switch between the front and the ones:
func switchButtonTapped() {
if let _frontDeviceInput = frontDeviceInput {
captureSession.beginConfiguration()
if let _currentInput = captureSession.inputs.first as? AVCaptureDeviceInput {
captureSession.removeInput(_currentInput)
let newDeviceInput = (_currentInput.device.position == .front) ? activeInput : _frontDeviceInput
captureSession.addInput(newDeviceInput!)
}
captureSession.commitConfiguration()
}
}
If you need more details, don't hesitate.
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add theactiveInput
elsewhere? You can check whether theactiveInput
is already present in thecaptureSession.inputs
and add/remove it accordingly.
– Yannick Loriot
Jan 2 at 15:54
add a comment |
To begin create a device input for the front camera:
let frontDevice: AVCaptureDevice? = {
for device in AVCaptureDevice.devices(for: AVMediaType.video) {
if device.position == .front {
return device
}
}
return nil
}()
lazy var frontDeviceInput: AVCaptureDeviceInput? = {
if let _frontDevice = self.frontDevice {
return try? AVCaptureDeviceInput(device: _frontDevice)
}
return nil
}()
Then in your switchButtonTapped
, if there is a front camera you can do the switch between the front and the ones:
func switchButtonTapped() {
if let _frontDeviceInput = frontDeviceInput {
captureSession.beginConfiguration()
if let _currentInput = captureSession.inputs.first as? AVCaptureDeviceInput {
captureSession.removeInput(_currentInput)
let newDeviceInput = (_currentInput.device.position == .front) ? activeInput : _frontDeviceInput
captureSession.addInput(newDeviceInput!)
}
captureSession.commitConfiguration()
}
}
If you need more details, don't hesitate.
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add theactiveInput
elsewhere? You can check whether theactiveInput
is already present in thecaptureSession.inputs
and add/remove it accordingly.
– Yannick Loriot
Jan 2 at 15:54
add a comment |
To begin create a device input for the front camera:
let frontDevice: AVCaptureDevice? = {
for device in AVCaptureDevice.devices(for: AVMediaType.video) {
if device.position == .front {
return device
}
}
return nil
}()
lazy var frontDeviceInput: AVCaptureDeviceInput? = {
if let _frontDevice = self.frontDevice {
return try? AVCaptureDeviceInput(device: _frontDevice)
}
return nil
}()
Then in your switchButtonTapped
, if there is a front camera you can do the switch between the front and the ones:
func switchButtonTapped() {
if let _frontDeviceInput = frontDeviceInput {
captureSession.beginConfiguration()
if let _currentInput = captureSession.inputs.first as? AVCaptureDeviceInput {
captureSession.removeInput(_currentInput)
let newDeviceInput = (_currentInput.device.position == .front) ? activeInput : _frontDeviceInput
captureSession.addInput(newDeviceInput!)
}
captureSession.commitConfiguration()
}
}
If you need more details, don't hesitate.
To begin create a device input for the front camera:
let frontDevice: AVCaptureDevice? = {
for device in AVCaptureDevice.devices(for: AVMediaType.video) {
if device.position == .front {
return device
}
}
return nil
}()
lazy var frontDeviceInput: AVCaptureDeviceInput? = {
if let _frontDevice = self.frontDevice {
return try? AVCaptureDeviceInput(device: _frontDevice)
}
return nil
}()
Then in your switchButtonTapped
, if there is a front camera you can do the switch between the front and the ones:
func switchButtonTapped() {
if let _frontDeviceInput = frontDeviceInput {
captureSession.beginConfiguration()
if let _currentInput = captureSession.inputs.first as? AVCaptureDeviceInput {
captureSession.removeInput(_currentInput)
let newDeviceInput = (_currentInput.device.position == .front) ? activeInput : _frontDeviceInput
captureSession.addInput(newDeviceInput!)
}
captureSession.commitConfiguration()
}
}
If you need more details, don't hesitate.
answered Jan 1 at 19:32
Yannick LoriotYannick Loriot
6,34622850
6,34622850
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add theactiveInput
elsewhere? You can check whether theactiveInput
is already present in thecaptureSession.inputs
and add/remove it accordingly.
– Yannick Loriot
Jan 2 at 15:54
add a comment |
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add theactiveInput
elsewhere? You can check whether theactiveInput
is already present in thecaptureSession.inputs
and add/remove it accordingly.
– Yannick Loriot
Jan 2 at 15:54
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Hi, thankyou so much it worked. but when i tapped the switchbutton again, the app crashes with an error ;"An AVCaptureInput instance may not be added to more than one session'"
– Muneeb Jan
Jan 2 at 9:32
Are you sure you don't add the
activeInput
elsewhere? You can check whether the activeInput
is already present in the captureSession.inputs
and add/remove it accordingly.– Yannick Loriot
Jan 2 at 15:54
Are you sure you don't add the
activeInput
elsewhere? You can check whether the activeInput
is already present in the captureSession.inputs
and add/remove it accordingly.– Yannick Loriot
Jan 2 at 15:54
add a comment |
Try this code:
func switchCamera() {
session?.beginConfiguration()
let currentInput = session?.inputs.first as? AVCaptureDeviceInput
session?.removeInput(currentInput!)
let newCameraDevice = currentInput?.device.position == .back ? getCamera(with: .front) : getCamera(with: .back)
let newVideoInput = try? AVCaptureDeviceInput(device: newCameraDevice!)
session?.addInput(newVideoInput!)
session?.commitConfiguration()
}
add a comment |
Try this code:
func switchCamera() {
session?.beginConfiguration()
let currentInput = session?.inputs.first as? AVCaptureDeviceInput
session?.removeInput(currentInput!)
let newCameraDevice = currentInput?.device.position == .back ? getCamera(with: .front) : getCamera(with: .back)
let newVideoInput = try? AVCaptureDeviceInput(device: newCameraDevice!)
session?.addInput(newVideoInput!)
session?.commitConfiguration()
}
add a comment |
Try this code:
func switchCamera() {
session?.beginConfiguration()
let currentInput = session?.inputs.first as? AVCaptureDeviceInput
session?.removeInput(currentInput!)
let newCameraDevice = currentInput?.device.position == .back ? getCamera(with: .front) : getCamera(with: .back)
let newVideoInput = try? AVCaptureDeviceInput(device: newCameraDevice!)
session?.addInput(newVideoInput!)
session?.commitConfiguration()
}
Try this code:
func switchCamera() {
session?.beginConfiguration()
let currentInput = session?.inputs.first as? AVCaptureDeviceInput
session?.removeInput(currentInput!)
let newCameraDevice = currentInput?.device.position == .back ? getCamera(with: .front) : getCamera(with: .back)
let newVideoInput = try? AVCaptureDeviceInput(device: newCameraDevice!)
session?.addInput(newVideoInput!)
session?.commitConfiguration()
}
answered Jan 3 at 10:31


SamSam
655218
655218
add a comment |
add a comment |
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checkout this link may be it helps you stackoverflow.com/questions/20864372/…
– jignesh Vadadoriya
Jan 1 at 11:56
Supplying only a link as an answer is discouraged. The link can break if the page moves. Please consider explaining the basics of the answer you are providing since we’re not here to do basic searches that the OP could do themselves.
– Magnas
Jan 1 at 11:58