Switching Camera with a button in Swift - swift

Question

This seems to work to switch the camera from the back to the front, but I'm trying to come up with an 'if' statement so that I can switch it back too. Any ideas or advice?
#IBAction func didTouchSwitchButton(sender: UIButton) {
let camera = getDevice(.Front)
let cameraBack = getDevice(.Back)
do {
input = try AVCaptureDeviceInput(device: camera)
} catch let error as NSError {
print(error)
input = nil
}
if(captureSession?.canAddInput(input) == true){
captureSession?.addInput(input)
stillImageOutput?.outputSettings = [AVVideoCodecKey : AVVideoCodecJPEG]
if(captureSession?.canAddOutput(stillImageOutput) == true){
captureSession?.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer?.frame = cameraView.bounds
cameraView.layer.addSublayer(previewLayer!)
captureSession?.startRunning()
}
}
}

Answer 1

func switchCamera(_ sender: UIButton) {
if let session = AVCaptureSession() {
let currentCameraInput: AVCaptureInput = session.inputs[0]
session.removeInput(currentCameraInput)
var newCamera: AVCaptureDevice
newCamera = AVCaptureDevice.default(for: AVMediaType.video)!
if (currentCameraInput as! AVCaptureDeviceInput).device.position == .back {
UIView.transition(with: self.cameraView, duration: 0.5, options: .transitionFlipFromLeft, animations: {
newCamera = self.cameraWithPosition(.front)!
}, completion: nil)
} else {
UIView.transition(with: self.cameraView, duration: 0.5, options: .transitionFlipFromRight, animations: {
newCamera = self.cameraWithPosition(.back)!
}, completion: nil)
}
do {
try self.captureSession?.addInput(AVCaptureDeviceInput(device: newCamera))
}
catch {
print("error: \(error.localizedDescription)")
}
}
}
func cameraWithPosition(_ position: AVCaptureDevice.Position) -> AVCaptureDevice? {
let deviceDescoverySession = AVCaptureDevice.DiscoverySession.init(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: AVMediaType.video, position: AVCaptureDevice.Position.unspecified)
for device in deviceDescoverySession.devices {
if device.position == position {
return device
}
}
return nil
}

Answer 2

First create an enum to check the type of camera:
enum CameraDirection {
case .front
case .back
}
Then create a variable for the enum:
var currentDirection: CameraDirection = .front//or initial direction
Then in your didTouchSwitchButton function:
if (currentDirection == .front) {
currentDirection = .back
} else {
currentDirection = .front
}
reload()
You can see that I called a function called reload. Create that:
func reload() {
let camera = getDevice(.Front)
let cameraBack = getDevice(.Back)
do {
if currentDirection == .front {
input = try AVCaptureDeviceInput(device: camera)
} else {
input = try AVCaptureDeviceInput(device: cameraBack)
}
} catch let error as NSError {
print(error)
input = nil
}
//rest of code
}