iOS二維碼的掃描 全屏顯示區域性掃描
參考網址
http://www.jianshu.com/p/3fb24fc7b415
全屏顯示區域性掃描一直有問題 設定RectOfInterest也有問題,方法走,就是效果達不到 發現新增要寫在 中間
[self.view.layer insertSublayer:_preview atIndex:0];
[self updateLayout];
[_session startRunning];
- (void)defaultConfig {
_device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo
// Input
_input = [AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];
// Output
_output = [[AVCaptureMetadataOutputalloc]init];
[_outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];
// Session
_session = [[AVCaptureSessionalloc]init];
[_sessionsetSessionPreset
if ([_sessioncanAddInput:self.input])
{
[_session addInput:self.input];
}
if ([_sessioncanAddOutput:self.output])
{
[_session addOutput:self.output];
}
AVCaptureConnection *outputConnection = [_output connectionWithMediaType
outputConnection.videoOrientation = [QRUtilvideoOrientationFromCurrentDeviceOrientation];
//條形碼二維碼都支援
_output.metadataObjectTypes = @[AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode128Code,
AVMetadataObjectTypeQRCode];
//只支援二維碼
// _output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
// Preview
_preview =[AVCaptureVideoPreviewLayerlayerWithSession:_session];
_preview.videoGravity =AVLayerVideoGravityResize;
_preview.frame =[QRUtilscreenBounds];
[self.view.layer insertSublayer:_preview atIndex:0];
[self updateLayout];
_preview.connection.videoOrientation = [QRUtil videoOrientationFromCurrentDeviceOrientation];
[_session startRunning];
}
- (void)updateLayout {
_qrView.center = CGPointMake([QRUtil screenBounds].size.width / 2, [QRUtil screenBounds].size.height / 2);
//修正掃描區域
CGFloat screenHeight = self.view.frame.size.height;
CGFloat screenWidth = self.view.frame.size.width;
CGRect cropRect = CGRectMake((screenWidth - self.qrView.transparentArea.width) / 2,
(screenHeight - self.qrView.transparentArea.height) / 2,
self.qrView.transparentArea.width,
self.qrView.transparentArea.height);
// 設定AVCaptureMetadataOutput 的rectOfInterest 的屬性就可以了 這樣設定就可以:CGRectMake(y的起點/螢幕的高,x的起點/螢幕的寬,掃描的區域的高/螢幕的高,掃描的區域的寬/螢幕的寬)
[_output setRectOfInterest:CGRectMake(cropRect.origin.y / screenHeight,
cropRect.origin.x / screenWidth,
cropRect.size.height / screenHeight,
cropRect.size.width / screenWidth)];
}