How to open camera with flash mode - iphone

Question

I am developing a simple app in which i need to make my camera flash mode to be on continuously not only when capturing image. And the mode of operation should be camera not video recording. Is it possible ? If so than how. Please help me with some code

Answer 1

You can use the below method to toggle camera flash on and off.
- (void)toggleFlashlight
{
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;
}
}
You can also use the following method along with the display of camera,
- (void) toggleFlashlight {
// check if flashlight available
Class captureDeviceClass = NSClassFromString(#"AVCaptureDevice");
if (captureDeviceClass != nil) {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
[device lockForConfiguration:nil];
if (device.torchMode == AVCaptureTorchModeOff)
{
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];
}
else
{
[device setTorchMode:AVCaptureTorchModeOff];
[device setFlashMode:AVCaptureFlashModeOff];
}
[device unlockForConfiguration];
}
}
}
Source

Answer 2

Use this for Swift 4
func toggleFlash() {
guard let device = AVCaptureDevice.default(for: AVMediaType.video)
else {return}
if device.hasTorch {
do {
try device.lockForConfiguration()
if device.torchMode == AVCaptureDevice.TorchMode.on {
device.torchMode = AVCaptureDevice.TorchMode.off
//AVCaptureDevice.TorchModeAVCaptureDevice.TorchMode.off
} else {
do {
try device.setTorchModeOn(level: 1.0)
} catch {
print(error)
}
}
device.unlockForConfiguration()
} catch {
print(error)
}
}
}