I've tried to write my own module to detect is torch turned on/off.
According to documentation I've tried to run KVC as below
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (context == torchActiveObservationContext) {
AVCaptureDevice *thisDevice = (AVCaptureDevice*)object;
[self sendEventWithName:@"TorchEvent" body:@{@"isTorchActive": thisDevice.isTorchActive ? @"ACTIVE" : @"INACTIVE"}];
NSLog( @"Current torch level: %f", thisDevice.torchLevel);
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
NSLog( @"ABCDEF");
}
}
-(id) init {
if (self = [super init]) {
NSLog( @"Start Initialization");
AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
[videoDevice addObserver:self forKeyPath:@"isTorchActive" options:NSKeyValueObservingOptionNew context:torchActiveObservationContext];
NSLog( @"End Initialization");
// whatever other initialization code ...
}
return self;
}
But I noticed that any change is recorded if i try to turn on the torch in Control Panel. So i tried to do it much easier and check the current torch state manually. I created simple method:
RCT_EXPORT_BLOCKING_SYNCHRONOUS_METHOD(isTorchActive)
{
AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCapturePhotoSettings *photosettings = [AVCapturePhotoSettings photoSettings];
NSLog( videoDevice.isTorchActive ? @"on" : @"off");
NSLog( @"Level : %f", videoDevice.torchLevel);
return videoDevice.isTorchActive ? @"on" : @"off";
}
But it returns "off" all the time, even if torch is initially flashed. Torch level is 0.0.
What am I doing wrong?
