我只想打开闪光灯来拼接照片我正在尝试使用 AVCaptureDevice 和 AVCaptureFlashModeOn

Posted 2023-02-27

【中文标题】我只想打开闪光灯来拼接照片我正在尝试使用 AVCaptureDevice 和 AVCaptureFlashModeOn

【英文标题】：I just want to turn the flash on for stitching photo's I'm trying to use AVCaptureDevice and AVCaptureFlashModeOn

【发布时间】：2010-07-08 15:33:53

【问题描述】：

-(IBAction)turningFlashOn:(id)sender

AVCaptureSession *captureSession = [[AVCaptureSession alloc] init];
AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error = nil;
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:&error];

if (videoInput) 
    [captureSession addInput:videoInput];



    AVCaptureVideoDataOutput* videoOutput = [[AVCaptureVideoDataOutput alloc] init];
    [videoOutput setSampleBufferDelegate:self queue:dispatch_get_current_queue()];
    [captureSession addOutput:videoOutput];
    [captureSession startRunning];
    videoCaptureDevice.torchMode = AVCaptureFlashModeOn;

我被要求使用 lockForConfiguration 但它不起作用，或者我使用错了。谁能告诉我我做错了什么？

【参考方案1】：

if([videoCaptureDevice lockForConfiguration]) 
  [videoCaptureDevice setTorchMode:AVCaptureTorchModeOn];
  [videoCaptureDevice unlockForConfiguration];
 

【讨论】：

[videoCaptureDevice setTorchMode:AVCaptureTorchModeOff];或者只是释放你的 AVCaptureSession 对象。哪个更合适。

您应该在释放会话之前致电[session stopRunning];。在这里查看我的帖子：***.com/questions/3190034/…

【参考方案2】：

- (void)flashLightOn 


    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) 
        if ([device hasFlash] == YES) 

            [device lockForConfiguration:nil];
            [device setTorchMode:AVCaptureTorchModeOn];
            [device unlockForConfiguration];
        

    


-(void)flashLightOff 


    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices) 
        if ([device hasFlash] == YES) 

            [device lockForConfiguration:nil];
            [device setTorchMode:AVCaptureTorchModeOff];
            [device unlockForConfiguration];