Question

我正在尝试在ios8应用中实现多个镜头。我正在使用llsimplecamera（https://github.com/omergul123/LLSimpleCamera），它是AvFoundation的包装，可以像我一样工作。当我按下快门按钮时，调用'captureStillImageAsynchronouslyFromConnection'（AVCaptureStillImageOutput的一个实例的方法）并且一切正常，我获得了一张照片。如果我尝试将'captureStillImageAsynchronouslyFromConnection'设置为捕获多个镜头，在循环中，我没有得到任何照片。我尝试使用信号量技术：

    if ([self.captureDevice lockForConfiguration:nil]) {
    if ([self.captureDevice isFocusModeSupported:AVCaptureFocusModeLocked])
        [self.captureDevice setFocusMode:AVCaptureFocusModeLocked];
    if ([self.captureDevice isExposureModeSupported:AVCaptureExposureModeLocked])
        [self.captureDevice setExposureMode:AVCaptureExposureModeLocked];
    if ([self.captureDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeLocked])
        [self.captureDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeLocked];
}

AVCaptureConnection *videoConnection = [self captureConnection];
videoConnection.videoOrientation = [self orientationForConnection];

dispatch_semaphore_t sync = dispatch_semaphore_create(0);
while(1)
{
    [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
     {

         if (imageSampleBuffer != NULL)
         {
             NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
             UIImage *image = [UIImage imageWithData:imageData];
             NSLog(@"image %@",image);
         }
         dispatch_semaphore_signal(sync);
     }];
    dispatch_semaphore_wait(sync, DISPATCH_TIME_FOREVER);
}

return nil;

但我没有照片。我究竟做错了什么？提前谢谢

如何使用captureStillImageAsynchronouslyFromConnection捕获多个镜头

0 个答案: