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)size logo:(UIImage *)logo logoFrame:(CGRect)logoFrame red:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue;

具体实现如下:

#pragma mark - 生成二维码+ (UIImage *)qrCodeImageWithContent:(NSString *)content codeImageSize:(CGFloat)size logo:(UIImage *)logo logoFrame:(CGRect)logoFrame red:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue{ UIImage *image = [self qrCodeImageWithContent:content codeImageSize:size red:red green:green blue:blue]; //有 logo 则绘制 logo if (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 *)content codeImageSize:(CGSize)size red:(CGFloat)red green:(CGFloat)green blue:(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:0 green: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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