iOS二维码识别/二维码生成

if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) { self.captureSession.sessionPreset = AVCaptureSessionPreset1280x720; w = 1280.f; h = 720.f; } else if ([self.captureSession canSetSessionPreset:AVCaptureSessionPreset640x480]) { self.captureSession.sessionPreset = AVCaptureSessionPreset640x480; w = 960.f; h = 540.f; } captureOutput.metadataObjectTypes = [captureOutput availableMetadataObjectTypes]; CGRect bounds = [[UIScreen mainScreen] bounds]; if (!self.prevLayer) { self.prevLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession]; } // NSLog(@"prev %p %@", self.prevLayer, self.prevLayer); self.prevLayer.frame = bounds; self.prevLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer insertSublayer:self.prevLayer atIndex:0]; // 计算rectOfInterest CGFloat p1 = bounds.size.height/bounds.size.width; CGFloat p2 = w/h; CGRect cropRect = CGRectMake(CGRectGetMinX(_cropRect) - kQRReaderScanExpandWidth, CGRectGetMinY(_cropRect) - kQRReaderScanExpandHeight, CGRectGetWidth(_cropRect) + 2*kQRReaderScanExpandWidth, CGRectGetHeight(_cropRect) + 2*kQRReaderScanExpandHeight); // CGRect cropRect = _cropRect; if (fabs(p1 - p2) < 0.000001) { captureOutput.rectOfInterest = CGRectMake(cropRect.origin.y /bounds.size.height, cropRect.origin.x/bounds.size.width, cropRect.size.height/bounds.size.height, cropRect.size.width/bounds.size.width); } else if (p1 < p2) { //实际图像被截取一段高 CGFloat fixHeight = bounds.size.width * w / h; CGFloat fixPadding = (fixHeight - bounds.size.height)/2; captureOutput.rectOfInterest = CGRectMake((cropRect.origin.y + fixPadding)/fixHeight, cropRect.origin.x/bounds.size.width, cropRect.size.height/fixHeight, cropRect.size.width/bounds.size.width); } else { CGFloat fixWidth = bounds.size.height * w / h; CGFloat fixPadding = (fixWidth - bounds.size.width)/2; captureOutput.rectOfInterest = CGRectMake(cropRect.origin.y/bounds.size.height, (cropRect.origin.x + fixPadding)/fixWidth, cropRect.size.height/bounds.size.height, cropRect.size.width/fixWidth); }

识别二维码图片

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