iOS二维码、条形码生成（可指定大小、颜色）

时间：2022-07-24 17:47:14

一、前言： 
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.

二、二维码生成 
因为返回的都是UIImage 所以我写了一个UIImage的分类

// UIimage(QRCode).h 文件

//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:(NSInteger)blue;

// UIimage(QRCode).m 实现文件

#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:(NSInteger)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:(NSInteger)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);

}

三、条形码生成

// .h文件

#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:(NSInteger)blue;

#pragma mark - 生成条形码

+ (UIImage *)barcodeImageWithContent:(NSString *)content codeImageSize:(CGSize)size red:(CGFloat)red green:(CGFloat)green blue:(NSInteger)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);

}

四、测试

// 在控制器中实现

self.title = @"二维码和条形码";

    //条形码

    UIImage *barImage = [UIImage barcodeImageWithContent:@"123456"

                                             codeImageSize:CGSizeMake(300, 90)

                                                       red:0

                                                     green:0.4

                                                      blue: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 = [UIImage qrCodeImageWithContent:@"15280107764"

                                               codeImageSize:200

                                                      logo:[UIImage imageNamed:@"avatar"]

                                                   logoFrame:CGRectMake(75, 75, 50, 50)

                                                         red:0.0f

                                                       green:139/255.0f

                                                        blue: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 = [UIColor whiteColor];// #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];

// 参考来源 http://www.jianshu.com/p/b893690b472e

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