custom camera view switch camera front back - ios

Question

i am using custom camera view for my app. but when i am changing my view its not responding well i can't able to see my view whatever changes its stop showing live view if i am not changing then its working just fine ,i don`t know i try alot were i am doing mistake or missing something. my code is
-(void)abdbcam
{
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];
}*/
NSArray *devices = [AVCaptureDevice devices];
AVCaptureDevice *frontcamera;
AVCaptureDevice *backcamera;
for (AVCaptureDevice *device in devices)
{
NSLog(#"Device Nmae %#",[device localizedName]);
if ([device hasMediaType:AVMediaTypeVideo])
{
if ([device position] == AVCaptureDevicePositionBack)
{
NSLog(#"device position: bAck");
backcamera = device;
}
else
{
NSLog(#"device position : front");
frontcamera = device;
}
}
}
if (!FrontCamera)
{
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:backcamera error:&error];
if (!input)
{
NSLog(#"error: trying to open camera: %#", error);
}
[session addInput:input];
}
if (FrontCamera) {
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:frontcamera error:&error];
if (!input) {
NSLog(#"error: trying to open camera: %#", error);
}
[session addInput:input];
}
AVCaptureVideoPreviewLayer *previewLayer=[[AVCaptureVideoPreviewLayer alloc]initWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view]layer];
[rootLayer setMasksToBounds:YES];
CGRect frame=self.camerarole.frame;
[previewLayer setFrame:frame];
[rootLayer insertSublayer:previewLayer atIndex:0];
stillImageOutput=[[AVCaptureStillImageOutput alloc]init];
NSDictionary *outputSetting=[[NSDictionary alloc]initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil];
[stillImageOutput setOutputSettings:outputSetting];
[session addOutput:stillImageOutput];
[session startRunning];
}
// now my segment controller code is
- (IBAction)switchcamera:(id)sender {
if (cameraswitch.selectedSegmentIndex == 0) {
FrontCamera = YES;
[self abdbcam];
}
if (cameraswitch.selectedSegmentIndex == 1) {
[self abdbcam];
}
please have a look and suggest me if i am doing any mistake

Answer 1

So I've already implemented custom camera switch. Check this code below:
isUsingFrontFacingCamera is a bool flag, too detect which camera are you using at the moment
- (void) switchCam{
if (![self cameraIsRunning])
return;
AVCaptureDevicePosition desiredPosition;
if (isUsingFrontFacingCamera)
desiredPosition = AVCaptureDevicePositionBack;
else
desiredPosition = AVCaptureDevicePositionFront;
for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {
if ([d position] == desiredPosition) {
[[captureVideoPreviewLayer session] beginConfiguration];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:d error:nil];
for (AVCaptureInput *oldInput in [[captureVideoPreviewLayer session] inputs]) {
[[captureVideoPreviewLayer session] removeInput:oldInput];
}
[[captureVideoPreviewLayer session] addInput:input];
[[captureVideoPreviewLayer session] commitConfiguration];
break;
}
}
isUsingFrontFacingCamera = !isUsingFrontFacingCamera;
}

Answer 2

This code worked for while i am working. i am posting this because it will be helpful for anyone.
NSArray *inputs = session.inputs;
for ( AVCaptureDeviceInput *input in inputs ) {
AVCaptureDevice *device = input.device;
if ( [device hasMediaType:AVMediaTypeVideo] ) {
AVCaptureDevicePosition position = device.position;
AVCaptureDevice *newCamera = nil;
AVCaptureDeviceInput *newInput = nil;
if (position == AVCaptureDevicePositionFront)
newCamera = [self cameraWithPosition:AVCaptureDevicePositionBack];
else
newCamera = [self cameraWithPosition:AVCaptureDevicePositionFront];
newInput = [AVCaptureDeviceInput deviceInputWithDevice:newCamera error:nil];
// beginConfiguration ensures that pending changes are not applied immediately
[session beginConfiguration];
[session removeInput:input];
[session addInput:newInput];
// Changes take effect once the outermost commitConfiguration is invoked.
[session commitConfiguration];
break;
}
}
- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition)position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for ( AVCaptureDevice *device in devices )
if ( device.position == position )
return device;
return nil;
}