iOS中生成指定大小、指定颜色的二维码和条形码方法详解

iOS7.0之后可以利用系统原生 API 生成二维码, iOS8.0之后可以生成条形码, 系统默认生成的颜色是黑色. 在这里, 利用以下方法可以生成指定大小、指定颜色的二维码和条形码, 还可以添加背景颜色、阴影效果, 以下是具体方法.
一. 生成二维码
Avilable in iOS 7.0 and later
方法如下:

#pragma mark - 生成二维码//Avilable in iOS 7.0 and later+ （UIImage *）qrCodeImageWithContent:（NSString *）content codeImageSize:（CGFloat）sizelogo:（UIImage *）logo logoFrame:（CGRect）logoFramered:（CGFloat）red green:（CGFloat）greenblue:（CGFloat）blue;

具体实现如下:

#pragma mark - 生成二维码+ （UIImage *）qrCodeImageWithContent:（NSString *）content codeImageSize:（CGFloat）sizelogo:（UIImage *）logo logoFrame:（CGRect）logoFramered:（CGFloat）red green:（CGFloat）greenblue:（CGFloat）blue{ UIImage *image = [self qrCodeImageWithContent:content codeImageSize:size red:red green:green blue:blue];//有 logo 则绘制 logoif （logo ！= nil） {UIGraphicsBeginImageContext（image.size）;[image drawInRect:CGRectMake（0, 0, image.size.width, image.size.height）];[logo drawInRect:logoFrame];UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext（）;UIGraphicsEndImageContext（）;return resultImage;}else{return image;}}//改变二维码颜色+ （UIImage *）qrCodeImageWithContent:（NSString *）content codeImageSize:（CGFloat）size red:（CGFloat）red green:（CGFloat）green blue:（CGFloat）blue{UIImage *image = [self qrCodeImageWithContent:content codeImageSize:size];int imageWidth = image.size.width;int imageHeight = image.size.height;size_t bytesPerRow = imageWidth * 4;uint32_t *rgbImageBuf = （uint32_t *）malloc（bytesPerRow * imageHeight）;CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB（）;CGContextRef context = CGBitmapContextCreate（rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpaceRef, kCGBitmapByteOrder32Little|kCGImageAlphaNoneSkipLast）;CGContextDrawImage（context, CGRectMake（0, 0, imageWidth, imageHeight）, image.CGImage）;//遍历像素, 改变像素点颜色int pixelNum = imageWidth * imageHeight;uint32_t *pCurPtr = rgbImageBuf;for （int i = 0; i<pixelNum; i++, pCurPtr++） {if （（*pCurPtr & 0xFFFFFF00） < 0x99999900） {uint8_t* ptr = （uint8_t*）pCurPtr;ptr[3] = red*255;ptr[2] = green*255;ptr[1] = blue*255;}else{uint8_t* ptr = （uint8_t*）pCurPtr;ptr[0] = 0;}}//取出图片CGDataProviderRef dataProvider = CGDataProviderCreateWithData（NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData）;CGImageRef imageRef = CGImageCreate（imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpaceRef,kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProvider,NULL, true, kCGRenderingIntentDefault）;CGDataProviderRelease（dataProvider）;UIImage *resultImage = [UIImage imageWithCGImage:imageRef];CGImageRelease（imageRef）;CGContextRelease（context）;CGColorSpaceRelease（colorSpaceRef）;return resultImage;}//改变二维码尺寸大小+ （UIImage *）qrCodeImageWithContent:（NSString *）content codeImageSize:（CGFloat）size{CIImage *image = [self qrCodeImageWithContent:content];CGRect integralRect = CGRectIntegral（image.extent）;CGFloat scale = MIN（size/CGRectGetWidth（integralRect）, size/CGRectGetHeight（integralRect））;size_t width = CGRectGetWidth（integralRect）*scale;size_t height = CGRectGetHeight（integralRect）*scale;CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray（）;CGContextRef bitmapRef = CGBitmapContextCreate（nil, width, height, 8, 0, colorSpaceRef, （CGBitmapInfo）kCGImageAlphaNone）;CIContext *context = [CIContext contextWithOptions:nil];CGImageRef bitmapImage = [context createCGImage:image fromRect:integralRect];CGContextSetInterpolationQuality（bitmapRef, kCGInterpolationNone）;CGContextScaleCTM（bitmapRef, scale, scale）;CGContextDrawImage（bitmapRef, integralRect, bitmapImage）;CGImageRef scaledImage = CGBitmapContextCreateImage（bitmapRef）;CGContextRelease（bitmapRef）;CGImageRelease（bitmapImage）;return [UIImage imageWithCGImage:scaledImage];}//生成最原始的二维码+ （CIImage *）qrCodeImageWithContent:（NSString *）content{CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];NSData *contentData = [content dataUsingEncoding:NSUTF8StringEncoding];[qrFilter setValue:contentData forKey:@"inputMessage"];[qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];CIImage *image = qrFilter.outputImage;return image;}void ProviderReleaseData （void *info, const void *data, size_t size）{free（（void*）data）;}

一. 生成条形码
Avilable in iOS 8.0 and later
方法如下:

#pragma mark - 生成条形码//Avilable in iOS 8.0 and later+ （UIImage *）barcodeImageWithContent:（NSString *）contentcodeImageSize:（CGSize）size red:（CGFloat）redgreen:（CGFloat）greenblue:（CGFloat）blue;

具体实现如下:

#pragma mark - 生成条形码+ （UIImage *）barcodeImageWithContent:（NSString *）content codeImageSize:（CGSize）size red:（CGFloat）red green:（CGFloat）green blue:（CGFloat）blue{UIImage *image = [self barcodeImageWithContent:content codeImageSize:size];int imageWidth = image.size.width;int imageHeight = image.size.height;size_t bytesPerRow = imageWidth * 4;uint32_t *rgbImageBuf = （uint32_t *）malloc（bytesPerRow * imageHeight）;CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB（）;CGContextRef context = CGBitmapContextCreate（rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpaceRef, kCGBitmapByteOrder32Little|kCGImageAlphaNoneSkipLast）;CGContextDrawImage（context, CGRectMake（0, 0, imageWidth, imageHeight）, image.CGImage）;//遍历像素, 改变像素点颜色int pixelNum = imageWidth * imageHeight;uint32_t *pCurPtr = rgbImageBuf;for （int i = 0; i<pixelNum; i++, pCurPtr++） {if （（*pCurPtr & 0xFFFFFF00） < 0x99999900） {uint8_t* ptr = （uint8_t*）pCurPtr;ptr[3] = red*255;ptr[2] = green*255;ptr[1] = blue*255;}else{uint8_t* ptr = （uint8_t*）pCurPtr;ptr[0] = 0;}}//取出图片CGDataProviderRef dataProvider = CGDataProviderCreateWithData（NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData）;CGImageRef imageRef = CGImageCreate（imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpaceRef,kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProvider,NULL, true, kCGRenderingIntentDefault）;CGDataProviderRelease（dataProvider）;UIImage *resultImage = [UIImage imageWithCGImage:imageRef];CGImageRelease（imageRef）;CGContextRelease（context）;CGColorSpaceRelease（colorSpaceRef）;return resultImage;}//改变条形码尺寸大小+ （UIImage *）barcodeImageWithContent:（NSString *）content codeImageSize:（CGSize）size{CIImage *image = [self barcodeImageWithContent:content];CGRect integralRect = CGRectIntegral（image.extent）;CGFloat scale = MIN（size.width/CGRectGetWidth（integralRect）, size.height/CGRectGetHeight（integralRect））;size_t width = CGRectGetWidth（integralRect）*scale;size_t height = CGRectGetHeight（integralRect）*scale;CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray（）;CGContextRef bitmapRef = CGBitmapContextCreate（nil, width, height, 8, 0, colorSpaceRef, （CGBitmapInfo）kCGImageAlphaNone）;CIContext *context = [CIContext contextWithOptions:nil];CGImageRef bitmapImage = [context createCGImage:image fromRect:integralRect];CGContextSetInterpolationQuality（bitmapRef, kCGInterpolationNone）;CGContextScaleCTM（bitmapRef, scale, scale）;CGContextDrawImage（bitmapRef, integralRect, bitmapImage）;CGImageRef scaledImage = CGBitmapContextCreateImage（bitmapRef）;CGContextRelease（bitmapRef）;CGImageRelease（bitmapImage）;return [UIImage imageWithCGImage:scaledImage];}//生成最原始的条形码+ （CIImage *）barcodeImageWithContent:（NSString *）content{CIFilter *qrFilter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];NSData *contentData = [content dataUsingEncoding:NSUTF8StringEncoding];[qrFilter setValue:contentData forKey:@"inputMessage"];[qrFilter setValue:@（0.00） forKey:@"inputQuietSpace"];CIImage *image = qrFilter.outputImage;return image;}void ProviderReleaseData （void *info, const void *data, size_t size）{free（（void*）data）;}

三.测试
主要代码如下:

//-----------------------------------二维码、条形码测试--------------------------------------------------//条形码UIImage *barImage = [Utilities barcodeImageWithContent:@"123456"codeImageSize:CGSizeMake（300, 90）red:0green:0.4blue:0.6];CGRect barImageView_Frame = CGRectMake（self.view.bounds.size.width/2-300/2, 100, 300, 90）;UIImageView *barImageView = [[UIImageView alloc] initWithFrame:barImageView_Frame];barImageView.image = barImage;barImageView.backgroundColor = [UIColor clearColor];//阴影barImageView.layer.shadowOffset = CGSizeMake（-0.5, 0.5）;barImageView.layer.shadowRadius = 0.5;barImageView.layer.shadowColor = [UIColor blackColor].CGColor;barImageView.layer.shadowOpacity = 0.2;[self.view addSubview:barImageView];//二维码UIImage *qrCodeImage = [Utilities qrCodeImageWithContent:@"How are you?"codeImageSize:200logo:[UIImage imageNamed:@"logo.png"]logoFrame:CGRectMake（75, 75, 50, 50）red:0.0fgreen:139/255.0fblue:139/255.0f];CGRect qrCodeImageView_Frame = CGRectMake（self.view.bounds.size.width/2-200/2, CGRectGetMaxY（barImageView.frame）+20, 200, 200）;UIImageView *qrCodeImageView = [[UIImageView alloc] initWithFrame:qrCodeImageView_Frame];qrCodeImageView.image = qrCodeImage;qrCodeImageView.backgroundColor = [Utilities colorWithHexString:@"#FDF5E6"];// #006400//阴影qrCodeImageView.layer.shadowOffset = CGSizeMake（0, 0）;qrCodeImageView.layer.shadowRadius = 5;qrCodeImageView.layer.shadowColor = [UIColor blackColor].CGColor;qrCodeImageView.layer.shadowOpacity = 0.4;[self.view addSubview:qrCodeImageView];

运行结果如下:

运行结果

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