如何用闪光模式打开相机

Question

我正在开发一个简单的应用程序,我需要让我的相机闪光模式不仅在拍摄图像时持续开启.而操作方式应该是相机而不是视频录制.可能吗 ？如果是这样的话.请帮我一些代码

Answer 1

您可以使用以下方法来打开和关闭相机闪光灯.

- (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;
  }
}

您还可以使用以下方法以及相机的显示,

- (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];
    }
} 
}

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