Question

我在ios应用程序中使用zbar sdk。我想调暗相机闪光灯。在ios文档中，我找到了AVCaptureDevice

- (BOOL)setTorchModeOnWithLevel:(float)torchLevel error:(NSError **)outError

在AVCaptureDevice类中，setTorchModeOnWithLevel函数将亮度级别设置为0-1。在zbar sdk中，我在readerview类中找到了这个对象我正在使用以下代码

    ZBarReaderViewController *mReader =  [[ZBarReaderViewController alloc] init];
    mReader.showsZBarControls = NO;
    mReader.showsHelpOnFail = NO;
    mReader.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;

    mReader.readerDelegate = self;
    //    reader.cameraDevice = UIImagePickerControllerCameraDeviceFront;
    mReader.supportedOrientationsMask = ZBarOrientationMaskAll;
    CGRect cropRect = CGRectMake(0, 0, cameraView.frame.size.width , cameraView.frame.size.height);

    mReader.view.frame = cropRect;

    mReader.cameraOverlayView = [self setOverlayPickerView];
    AVCaptureDevice *mDevice = mReader.readerView.device; //mReader.readerView.device returns object of AVCaptureDevice

当我尝试访问AVCaptureDevice函数时，它没有显示任何建议，当我手动编写它然后它给出错误。

[mDevice setTorchModeOnWithLevel:0.5 error:error];

如何使用AVCaptureDevice对象以便我可以设置闪光灯的暗淡级别？

Answer 1

Zbar SDK中没有用于控制Flash灯级的API。你可以打开/关闭闪光灯。

Answer 2

我正在调用以下给出错误的函数

[mDevice setTorchModeOnWithLevel:0.5 error:error];

错误的原因是我没有在构建设置中包含AVFoundation库。包括我的错误后解决 @rakeshNS我们可以使用

调暗zbar sdk灯光

AVCaptureDevice *mDevice = mReader.readerView.device;
[mDevice setTorchModeOnWithLevel:0.5 error:nil];

感谢大家

Answer 3

我正在使用下面的代码希望它可以帮助你：）

reader = [ZBarReaderViewController new];
reader.readerDelegate = self;

reader.readerView.torchMode = 2;
reader.showsZBarControls = FALSE;
reader.tracksSymbols = YES;
[reader.scanner setSymbology: ZBAR_ISBN13
                      config: ZBAR_CFG_ENABLE
                          to: 0];
reader.readerView.zoom = 1.0;

reader.cameraOverlayView = [self setLayoutView];


if([[defaults valueForKey:@"flashLight1"] isEqualToString:@"off"] )
    reader.cameraFlashMode = UIImagePickerControllerCameraFlashModeOff;
else
reader.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;

如何在zbar sdk中设置相机闪光灯亮度

3 个答案: