Using this tutorial here: [http://www.musicalgeometry.com/?p=1297][1] I have created a custom overlay and image capture with `AVCaptureSession`.

I am attempting to allow the user to switch between the front and back camera. Here is my code in `CaptureSessionManager` to switch cameras:

    - (void)addVideoInputFrontCamera:(BOOL)front {
        NSArray *devices = [AVCaptureDevice devices];
        AVCaptureDevice *frontCamera;
        AVCaptureDevice *backCamera;
        
        for (AVCaptureDevice *device in devices) {
            
            //NSLog(@&quot;Device name: %@&quot;, [device localizedName]);
            
            if ([device hasMediaType:AVMediaTypeVideo]) {
                
                if ([device position] == AVCaptureDevicePositionBack) {
                    //NSLog(@&quot;Device position : back&quot;);
                    backCamera = device;
                }
                else {
                    //NSLog(@&quot;Device position : front&quot;);
                    frontCamera = device;
                }
            }
        }
        
        NSError *error = nil;
        
        if (front) {
            AVCaptureDeviceInput *frontFacingCameraDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:frontCamera error:&amp;error];
            if (!error) {
                if ([[self captureSession] canAddInput:frontFacingCameraDeviceInput]) {
                    [[self captureSession] addInput:frontFacingCameraDeviceInput];
                } else {
                    NSLog(@&quot;Couldn&#39;t add front facing video input&quot;);
                }
            }
        } else {
            AVCaptureDeviceInput *backFacingCameraDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:backCamera error:&amp;error];
            if (!error) {
                if ([[self captureSession] canAddInput:backFacingCameraDeviceInput]) {
                    [[self captureSession] addInput:backFacingCameraDeviceInput];
                } else {
                    NSLog(@&quot;Couldn&#39;t add back facing video input&quot;);
                }
            }
        }
    }

Now in my custom overlay controller I initialize everything like so in `viewDidLoad`:

    [self setCaptureManager:[[CaptureSessionManager alloc] init]];
        
    [[self captureManager] addVideoInputFrontCamera:NO]; // set to YES for Front Camera, No for Back camera
        
    [[self captureManager] addStillImageOutput];
        
    [[self captureManager] addVideoPreviewLayer];
    CGRect layerRect = [[[self view] layer] bounds];
    [[[self captureManager] previewLayer] setBounds:layerRect];
    [[[self captureManager] previewLayer] setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
    [[[self view] layer] addSublayer:[[self captureManager] previewLayer]];
    
    [[_captureManager captureSession] startRunning];


The switch camera button is connected to a method called `switchCamera`. I have tried this:

    - (void)switchCameraView:(id)sender {
        
        [[self captureManager] addVideoInputFrontCamera:YES]; // set to YES for Front Camera, No for Back camera
        
    }


When calling this, I get the error `NSLog` from the `CaptureSessionManager` and I cannot figure out why. In `viewDidLoad`, if I set the `fontCamera` to `YES`, it shows the front camera but cannot switch to back, and vice versa.

Any ideas on how to get it to switch properly?

  [1]: http://www.musicalgeometry.com/?p=1297

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Switch cameras with avcapturesession