如何在UIImagePickerController上访问相机闪光灯？ [英] How to access camera flash on UIImagePickerController?

问题描述

我想知道如何使用UIImagePickerController打开iPhone 4上的相机闪光灯。

I would like to know how to switch on the camera flash on the iPhone 4 with UIImagePickerController.

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];
}

}

我已经在这里阅读了UIImagePickerController类参考网页： http://bit.ly/cdAhhB 但我没有找到答案。有人可以帮帮我吗？

I already read the UIImagePickerController Class Reference web page here: http://bit.ly/cdAhhB but I didn't find the answer. Can someone please help me?

谢谢

推荐答案

你可以使用这个。当您想要打开或关闭闪光灯时，基本上可以调用'toggleTorch'。希望这是你想要的。

You can use this. Basically call 'toggleTorch' when you want to turn the flash on or off. Hopefully this is what you were looking for.

- (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:@"[e-mail]"] 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:@"[e-mail]"]];

            [torchSession stopRunning];

        }

    }

}

-(IBAction)powerBtn
{
    [self toggleTorch];
}

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