iOS 7.1 imagePicker CameraFlashMode not indicating Flash state - ios

Question

I have iPhone application which overlays the camera with custom view.
I have a button to switch between camera flash mode, this is the code
switch ([self.imagePickerController cameraFlashMode]) {
case UIImagePickerControllerCameraFlashModeAuto:
[self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeOn];
return #"On";
break;
case UIImagePickerControllerCameraFlashModeOn:
[self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeOff];
return #"Off";
break;
case UIImagePickerControllerCameraFlashModeOff:
[self.imagePickerController setCameraFlashMode:UIImagePickerControllerCameraFlashModeAuto];
return #"Auto";
break;
default:
break;
}
This is my problem: Worked perfectly fine on iOS 7.0x, but in iOS 7.1 the cameraFlashMode property returns UIImagePickerControllerCameraFlashModeAuto regardless of its real state.
The flash mode does change, but i get no indication of that.
Any clues?
Thanks

Answer 1

I solved it like this:
#property (nonatomic) NSInteger flashMode;
if (_flashMode == UIImagePickerControllerCameraFlashModeAuto)
{
_flashMode = UIImagePickerControllerCameraFlashModeOff;
}
else if (_flashMode == UIImagePickerControllerCameraFlashModeOff)
{
_flashMode = UIImagePickerControllerCameraFlashModeOn;
}
else if (_flashMode == UIImagePickerControllerCameraFlashModeOn)
{
_flashMode = UIImagePickerControllerCameraFlashModeAuto;
}
_cameraPicker.cameraFlashMode = (UIImagePickerControllerCameraFlashMode)_flashMode;

Answer 2

Okay, so I researched this in great detail, and stumbled upon this helpful article online:
http://www.c2itconsulting.com/2013/10/ios-flash-setting-on-camera-picker-only-available-after-view-is-displayed/
I took their advice, and now I set the flash setting just before the user takes the picture. Instead of checking to see what the camera's current flash setting is, all I do is check my flash button's titleLabel text to see what the user wants as their flash setting:
Here is the code I came up with, which solves the problem perfectly for me now. I hope this helps out all of you with this same problem that didn't exist on iOS 7.0, but now does on iOS 7.1.
#define deviceHasCameraFlash [UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear]
- (void)capturePhoto
{
if (self.cameraDevice != UIImagePickerControllerCameraDeviceFront && deviceHasCameraFlash)
{
if ([self.flashButton.titleLabel.text isEqualToString:#"Auto"])
{
self.cameraFlashMode = UIImagePickerControllerCameraFlashModeAuto;
}
else if ([self.flashButton.titleLabel.text isEqualToString:#"Off"])
{
self.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
}
else if ([self.flashButton.titleLabel.text isEqualToString:#"On"])
{
self.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;
}
}
[self takePicture];
}

Answer 3

Try to use AVCaptureDevice:
Class captureDeviceClass = NSClassFromString(#"AVCaptureDevice");
if (captureDeviceClass != nil) {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
[device lockForConfiguration:nil];
if ([device hasTorch]) {
if (device.torchMode == AVCaptureTorchModeAuto) {
NSLog(#"Auto");
}
if (device.torchMode == AVCaptureTorchModeOn) {
NSLog(#"On");
}
if (device.torchMode == AVCaptureTorchModeOff) {
NSLog(#"Of");
}
}
if ([device hasFlash]) {
if (device.flashMode == AVCaptureFlashModeAuto) {
NSLog(#"Auto");
}
if (device.flashMode == AVCaptureFlashModeOn) {
NSLog(#"On");
}
if (device.flashMode == AVCaptureFlashModeOff) {
NSLog(#"Of");
}
}
[device unlockForConfiguration];
}

Answer 4

The answer above did't worked for me in iOS 7.1 #daidai this is what i did and this worked for me
In your .h-file the property flashMode
- (void)didTapFlash:(id)sender
{
if (self.flashMode == UIImagePickerControllerCameraFlashModeAuto) {
//toggle your button to "on"
[self.imagePicker setCameraFlashMode:UIImagePickerControllerCameraFlashModeOn];
[self.flashButton setImage:[UIImage imageNamed:#"flashOn"] forState:UIControlStateNormal];
self.flashMode = UIImagePickerControllerCameraFlashModeOn;
NSLog(#"On state: %d", self.flashMode);
}else if (self.flashMode == UIImagePickerControllerCameraFlashModeOn){
//toggle your button to "Off"
[self.imagePicker setCameraFlashMode:UIImagePickerControllerCameraFlashModeOff];
[self.flashButton setImage:[UIImage imageNamed:#"flashOf"] forState:UIControlStateNormal];
self.flashMode = UIImagePickerControllerCameraFlashModeOff;
NSLog(#"Of state: %d", self.flashMode);
}else if (self.flashMode == UIImagePickerControllerCameraFlashModeOff){
//toggle your button to "Auto"
[self.imagePicker setCameraFlashMode:UIImagePickerControllerCameraFlashModeAuto];
[self.flashButton setImage:[UIImage imageNamed:#"flashAuto"] forState:UIControlStateNormal];
self.flashMode = UIImagePickerControllerCameraFlashModeAuto;
NSLog(#"Auto state: %d", self.flashMode);
}
}