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  1. PO
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    <p>here is my code, it works perfect for me , you can refer to it </p> <pre><code>- (void)initCapture { AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:nil]; if (!captureInput) { return; } AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init]; /* captureOutput:didOutputSampleBuffer:fromConnection delegate method !*/ [captureOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()]; NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey; NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]; NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; [captureOutput setVideoSettings:videoSettings]; self.captureSession = [[AVCaptureSession alloc] init]; NSString* preset = 0; if (!preset) { preset = AVCaptureSessionPresetMedium; } self.captureSession.sessionPreset = preset; if ([self.captureSession canAddInput:captureInput]) { [self.captureSession addInput:captureInput]; } if ([self.captureSession canAddOutput:captureOutput]) { [self.captureSession addOutput:captureOutput]; } //handle prevLayer if (!self.captureVideoPreviewLayer) { self.captureVideoPreviewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; } //if you want to adjust the previewlayer frame, here! self.captureVideoPreviewLayer.frame = self.view.bounds; self.captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer: self.captureVideoPreviewLayer]; [self.captureSession startRunning]; } </code></pre>
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    1. POGet Camera Preview to AVCaptureVideoPreviewLayer
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    1. USjianpx
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      1. VTUpMod
    1. COof course , you can also wrap it with dispatch_async block.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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