ios二维码生成
//创建滤镜对象
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
//恢复滤镜的默认属性
[filter setDefaults];
NSData *infoData = [data dataUsingEncoding:NSUTF8StringEncoding];
//设置filter的InputMessages数据
[filter setValue:infoData forKeyPath:@"inputMessage"];
CIImage *outputImage = [filter outputImage];
UIImage *image = [self createUIImageFromCIImage:outputImage withWidth:width];
return image;
}
根据CIImage生成指定大小的UIImage
+ (UIImage *)createUIImageFromCIImage:(CIImage *)CIImage withWidth:(CGFloat)imageWidth{
CGRect extent = CGRectIntegral(CIImage.extent);
CGFloat scale = MIN(imageWidth / CGRectGetWidth(extent), imageWidth / CGRectGetHeight(extent));
//创建bitMap
size_t width = CGRectGetWidth(extent) * scale;
size_t height = CGRectGetHeight(extent) * scale;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();
CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone);
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef bitmapImage = [context createCGImage:CIImage fromRect:extent];
CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return [UIImage imageWithCGImage:scaledImage];
}
+ (UIImage *)generateLogoQRCode:(NSString *)data imageWidth:(CGFloat)imageWidth logoImageName:(NSString *)logoImageName logoScaleToSuperView:(CGFloat)logoScale{
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
//恢复滤镜的默认属性
[filter setDefaults];
NSData *infoData = [data dataUsingEncoding:NSUTF8StringEncoding];
//设置filter的InputMessages数据
[filter setValue:infoData forKeyPath:@"inputMessage"];
CIImage *outputImage = [filter outputImage];
// outputImage = [outputImage imageByApplyingTransform:CGAffineTransformMakeScale(20, 20)];
//将CIImage转化为UIImage类型
UIImage *start_image = [self createUIImageFromCIImage:outputImage withWidth:imageWidth];
//添加logo
UIGraphicsBeginImageContext(start_image.size);
[start_image drawInRect:CGRectMake(0, 0, start_image.size.width, start_image.size.height)];
//画logo
UIImage *logoImage = [UIImage imageNamed:logoImageName];
CGFloat logoWidth = start_image.size.width * logoScale;
CGFloat logoHeight = start_image.size.height * logoScale;
CGFloat logoX = (start_image.size.width - logoWidth) / 2;
CGFloat logoY = (start_image.size.width - logoHeight) / 2;
[logoImage drawInRect:CGRectMake(logoX, logoY, logoWidth, logoHeight)];
//获取最后的图片
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return finalImage;
}
扫描
扫描前需要申请调用摄像头的权限
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
//创建输出流
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
//设置代理，在主线程中刷新
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//设置扫描范围（取值范围0-1，一屏幕右上角为坐标原点）
output.rectOfInterest = CGRectMake(0.2, 0.2, 0.6, 0.6);
_session = [[AVCaptureSession alloc] init];
//设置采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
//添加会话输入输出
[_session addInput:input];
[_session addOutput:output];
//设置输出数据类型，需要将元数据输出添加到会话中，才能指定元数据类型
//设置扫码支持的编码格式
output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeCode128Code];
//初始化previewLayer，传递给session将要显示什么
_previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
_previewLayer.frame = self.view.layer.bounds;
//将图层插入当前视图
[self.view.layer insertSublayer:_previewLayer atIndex:0];
//启动会话
[_session startRunning];
具体代码见GitHub：https://github.com/huyong668/HYQRCode
