[英]How to access camera flash on UIImagePickerController?
I would like to know how to switch on the camera flash on the iPhone 4 with UIImagePickerController. 我想知道如何使用UIImagePickerController打开iPhone 4上的相机闪光灯。
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerCameraDeviceFront] == YES)
{
/// What code here ///
}
else
{
NoFlash = [[UIAlertView alloc] initWithTitle:@"Uh-Oh"
message:@"Your device doesn't have a flash camera"
delegate:nil
cancelButtonTitle:@"mhmm, OK"
otherButtonTitles:nil];
NoFlash.delegate = self;
[NoFlash show];
[NoFlash release];
}
} }
I already read the UIImagePickerController Class Reference web page here: http://bit.ly/cdAhhB but I didn't find the answer. 我已经在这里阅读了UIImagePickerController类参考网页: http : //bit.ly/cdAhhB但我找不到答案。 Can someone please help me? 有人可以帮帮我吗?
Thanks 谢谢
-(void)flashSelected
{
if (PickerController.cameraFlashMode ==
UIImagePickerControllerCameraFlashModeOff) {
if ([UIImagePickerController
isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear ])
{
PickerController.cameraFlashMode =
UIImagePickerControllerCameraFlashModeOn;
}
}
else
{
PickerController.cameraFlashMode =
UIImagePickerControllerCameraFlashModeOff;
}
}
alternately.. 交替..
-(void)_flashToggle
{
if (! [UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear ])
return;
if (PickerController.cameraFlashMode == UIImagePickerControllerCameraFlashModeOff)
PickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;
else
PickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
}
You can use this. 你可以用它。 Basically call 'toggleTorch' when you want to turn the flash on or off. 当您想要打开或关闭闪光灯时,基本上可以调用'toggleTorch'。 Hopefully this is what you were looking for. 希望这是你想要的。
- (void) toggleTorch {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash]){
if (device.torchMode == AVCaptureTorchModeOff) {
NSLog(@"It's currently off.. turning on now.");
[power setImage:[UIImage imageNamed:@"on@2x.png"] forState:UIControlStateNormal];
AVCaptureDeviceInput *flashInput = [AVCaptureDeviceInput deviceInputWithDevice:device error: nil];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session beginConfiguration];
[device lockForConfiguration:nil];
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];
[session addInput:flashInput];
[session addOutput:output];
[device unlockForConfiguration];
[output release];
[session commitConfiguration];
[session startRunning];
[self setTorchSession:session];
[session release];
}
else {
NSLog(@"It's currently on.. turning off now.");
[power.imageView setImage:[UIImage imageNamed:@"off@2x.png"]];
[torchSession stopRunning];
}
}
}
-(IBAction)powerBtn
{
[self toggleTorch];
}
// not all devices have two cameras or a flash so just check here
if ( [UIImagePickerController isCameraDeviceAvailable: UIImagePickerControllerCameraDeviceRear] ) {
imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
if ( [UIImagePickerController isCameraDeviceAvailable: UIImagePickerControllerCameraDeviceFront] ) {
cameraSelectionButton.alpha = 1.0;
showCameraSelection = YES;
}
} else {
imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
}
// flash mode on
if ([UIImagePickerController isFlashAvailableForCameraDevice:imagePicker.cameraDevice] )
{
imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
flashModeButton.alpha = 1.0;
showFlashMode = YES;
}
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