How to set scanning bound using AVFoundation

Question

I am trying barcode scanner in one of my iOS application. I had successfully implemented the barcode scanner.

But currently barcode scanning is displayed in full screen only. But what I want is that, the video should be viewed in full screen and the barcode should be scanned in particular portion only. That is, if the barcode is placed in that portion then only it should be displayed. Below is my current code:

session=[[AVCaptureSession alloc]init];
device=[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSError *error=nil;

input=[AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (input) {
    [session addInput:input];
}
else{
    NSLog(@"Errod : %@",error);
}

output=[[AVCaptureMetadataOutput alloc]init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];

output.metadataObjectTypes=[output availableMetadataObjectTypes];

prevLayer=[AVCaptureVideoPreviewLayer layerWithSession:session];
[prevLayer setFrame:self.view.bounds];
[prevLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[self.view.layer addSublayer:prevLayer];

[session startRunning];

[self.view bringSubviewToFront:self.lblCode];
[self.view bringSubviewToFront:self.imgShade1];
[self.view bringSubviewToFront:self.imgShade2];

SergioM SergioM · Accepted Answer · 2014-08-15T03:58:42

This is what you are after:

CGRect visibleMetadataOutputRect = [prevLayer metadataOutputRectOfInterestForRect:areaOfInterest];

output.rectOfInterest = visibleMetadataOutputRect;

where areaOfInterest is a CGRect. Hope this solves the issue.

How to set scanning bound using AVFoundation

2 Answers