Objective-C AVCaptureDevice Front Camera - ios

Question

I have followed a tutorial that guided through a way to make a custom but simple camera app, almost exactly to the needs of the use I would like it. I actually have two issues that I need changing but I will focus on this first one for now.
The following code allows the use of the back camera, but I basically need it to be changed so that I can use the front camera. I will also link here the video I sourced it from to give them credit, and I followed what one of the commenters said about using the front camera but the answer didn't help at all.
https://www.youtube.com/watch?v=Xv1FfqVy-KM
I'm not excellent at coding at all, but trying to learn. Any help would be appreciated! Many thanks.
#interface ViewController ()
#end
#implementation ViewController
AVCaptureSession *session;
AVCaptureStillImageOutput *StillImageOutput;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewWillAppear:(BOOL)animated {
session = [[AVCaptureSession alloc] init];
[session setSessionPreset:AVCaptureSessionPresetPhoto];
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error;
AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];
if ([session canAddInput:deviceInput]) {
[session addInput:deviceInput];
}
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view] layer];
[rootLayer setMasksToBounds:YES];
CGRect frame = frameforcapture.frame;
[previewLayer setFrame:frame];
[rootLayer insertSublayer:previewLayer atIndex:0];
StillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
[StillImageOutput setOutputSettings:outputSettings];
[session addOutput:StillImageOutput];
[session startRunning];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)takephoto:(id)sender {
AVCaptureConnection *videoConnection = nil;
for (AVCaptureConnection *connection in StillImageOutput.connections) {
for (AVCaptureInputPort *port in [connection inputPorts ]) {
if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
videoConnection = connection;
break;
}
}
}
[StillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *image = [UIImage imageWithData:imageData];
imageView.image = image;
}
}];
}
#end

Answer 1

this code is returns an AVCaptureDevice instance for the default device of the given media type.
AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
change this code to
....
AVCaptureDevice *inputDevice = nil;
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for(AVCaptureDevice *camera in devices) {
if([camera position] == AVCaptureDevicePositionFront) { // is front camera
inputDevice = camera;
break;
}
}
......

Answer 2

- (IBAction)btnCameraClicked:(id)sender {
AVCaptureDevicePosition desiredPosition;
if (isUsingFrontFacingCamera)
desiredPosition = AVCaptureDevicePositionBack;
else
desiredPosition = AVCaptureDevicePositionFront;
for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
if ([d position] == desiredPosition) {
[[previewLayer session] beginConfiguration];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:d error:nil];
for (AVCaptureInput *oldInput in [[previewLayer session] inputs]) {
[[previewLayer session] removeInput:oldInput];
}
[[previewLayer session] addInput:input];
[[previewLayer session] commitConfiguration];
break;
}
}
isUsingFrontFacingCamera = !isUsingFrontFacingCamera;
}
//Declare in .h file
AVCaptureVideoPreviewLayer *previewLayer;
BOOL isUsingFrontFacingCamera;