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AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; if (device.torchMode == AVCaptureTorchModeOff) { // Create an AV session AVCaptureSession *session = [[AVCaptureSession alloc] init]; // Create device input and add to current session AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error: nil]; [session addInput:input]; // Create video output and add to current session AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init]; [session addOutput:output]; // Start session configuration [session beginConfiguration]; [device lockForConfiguration:nil]; // Set torch to on [device setTorchMode:AVCaptureTorchModeOn]; [device unlockForConfiguration]; [session commitConfiguration]; // Start the session [session startRunning]; // Keep the session around [self setAVSession:session]; [output release]; } else { [AVSession stopRunning]; [AVSession release], AVSession = nil; }