Detecting if device has LED light or Flash

veterinarian2008 · 01-25-2012, 04:04 PM

Hello guys!

I am trying to find a way to detect if the device has the LED light functionality. I know how to know if the camera has a camera but the LED light I don't. I have been researching some and I have not find anything really helpful. Anyways, so I just want to show and alert using a if statement if the device has no LED light.

How can I do this? I have looked at the API's and Docs but I don't understand how to actually get in in a code...

Thank you.

**baja_yu** · 01-25-2012, 04:45 PM

Loading… > hasTorch

veterinarian2008 · 01-25-2012, 05:06 PM

Quote:

Originally Posted by baja_yu

Loading… > hasTorch

okay, so I did this:

Code:

if ([captureDevice hasTorch] && [captureDevice hasFlash]) {

	MainViewController *screen = [[MainViewController alloc] initWithNibName:nil bundle:nil];
     screen.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
	[self presentModalViewController:screen animated:YES];
	[screen release];
        
    }
    
    else {
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No LED Light Supoorted" message:@"Your Device does not support the LED light." delegate:self cancelButtonTitle:@"Okay" otherButtonTitles:nil];
        [alert show];
        [alert release];
        
    }

But when I try on my iPhone 4S, it just gives me the alert. why is that happening?

I think the code is fine...

thanks

veterinarian2008 · 01-25-2012, 06:06 PM

Anyone knows?

Duncan C · 01-25-2012, 06:31 PM

Quote:

Originally Posted by veterinarian2008

Hello guys!

I am trying to find a way to detect if the device has the LED light functionality. I know how to know if the camera has a camera but the LED light I don't. I have been researching some and I have not find anything really helpful. Anyways, so I just want to show and alert using a if statement if the device has no LED light.

How can I do this? I have looked at the API's and Docs but I don't understand how to actually get in in a code...

Thank you.

Are you checking the back camera?

Here is the code from the Xcode docs on the subject:

Code:

AVCaptureDevice *backCamera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ( [backCamera isTorchAvailable] && [backCamera isTorchModeSupported:AVCaptureTorchModeOn]  )
{
    BOOL success = [backCamera lockForConfiguration:nil];
    if ( success )
    {
        [backCamera setTorchMode:AVCaptureTorchModeOn];
        [backCamera unlockForConfiguration];
    }
}

veterinarian2008 · 01-26-2012, 07:16 AM

awesome!

It worked! Thank you.

I just got rid off this:

Code:

        [backCamera setTorchMode:AVCaptureTorchModeOn];

Thanks again...