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iOS中生成指定大小、指定颜色的二维码和条形码

iOS中生成指定大小、指定颜色的二维码和条形码

作者: jianshu_wl | 来源:发表于2016-05-09 16:05 被阅读3768次

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:0.4
                                                      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 = [Utilities qrCodeImageWithContent:@"How are you?"
                                               codeImageSize:200
                                                        logo:[UIImage imageNamed:@"logo.png"]
                                                   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 = [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

相关文章

网友评论

  • 张无忌_:二维码 的探测点 颜色可以修改嘛？
  • cj小牛:这个太复杂了（试了下还还扫描不出来）啊。 在网上找了半天有个简单的
    +(UIImage *)createQRCodeImageByString:(NSString *)inputStr{

    //2. 创建过滤器
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];//@"CIQRCodeGenerator" 是过滤器的名字固定这么写
    //3.恢复默认设置
    [filter setDefaults];

    //4. 给过滤器添加数据
    NSString *dataStr = inputStr;
    NSData *data = [dataStr dataUsingEncoding:NSUTF8StringEncoding];
    [filter setValue:data forKeyPath:@"inputMessage"]; //表示输入的信息


    CIImage *ciImg=filter.outputImage;


    //5.设置二维码的前景色和背景颜色
    CIFilter *colorFilter=[CIFilter filterWithName:@"CIFalseColor"];
    //5.1设置默认值

    [colorFilter setDefaults];
    [colorFilter setValue:ciImg forKey:@"inputImage"];
    [colorFilter setValue:[CIColor colorWithRed:67/255.0 green:207/255.0 blue:230/255.0 alpha:1] forKey:@"inputColor0"];
    [colorFilter setValue:[CIColor colorWithRed:0.0f green:0.0 blue:0.0f alpha:0.5] forKey:@"inputColor1"];
    //5.3获取生存的图片
    ciImg=colorFilter.outputImage;

    ciImg = [ciImg imageByApplyingTransform:CGAffineTransformMakeScale(20, 20)];

    UIImage *image = [UIImage imageWithCIImage:ciImg];
    // 8.添加中间图片
    // 8.1开启图形上下文
    UIGraphicsBeginImageContext(image.size);
    // 8.2画二维码图片
    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
    // 8.4取出图片
    UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
    // 8.5关闭图形上下文
    UIGraphicsEndImageContext();



    return finalImage;

    }



    这两句设置当前颜色和背景色

    [colorFilter setValue:[CIColor colorWithRed:67/255.0 green:207/255.0 blue:230/255.0 alpha:1] forKey:@"inputColor0"];
    [colorFilter setValue:[CIColor colorWithRed:0.0f green:0.0 blue:0.0f alpha:0.5] forKey:@"inputColor1"];
    春暖花已开:@cj小牛 感谢找到原因之后并说明，因为中国程序猿找到问题原因之后，通常不愿意分享出来
    cj小牛:更新下 我扫描楼主的二维码扫描不上的原因是因为 背景色设置的太深了， 所以小伙伴记得要将二维码的颜色要比被禁的颜色深很多
  • cj小牛:我的怎么也扫描不出来啊
  • IOS_Wek:彩色的二维码貌似系统扫不出来啊。。。。。
  • 娜娜的世界123:使用条形码生成是nil
  • NiuBaBa:请问Utilities这个是什么意思？我在使用的时候都不给提示
    NiuBaBa:@NiuBaBa 已经明白了，多谢
  • 背着吉他去流浪:请问一下你的Demo在哪???
  • 流刃若火泣:nice！给你点个👍
  • Timi:用到了再来看看
  • 笨鸟后飞了:很nice啊，点赞
  • 9f94d02340f1:收藏先。指不定就要用了。
  • 酷酷的哀殿:http://blog.163.com/qi_qiyu@126/blog/static/22617066201641053751854/
    这个也是你写的？
    jianshu_wl:@酷酷的哀殿 不是，是他们转载的。但是他们没问过我就直接转载了。 :sweat:
  • 奔波儿灞与灞波儿奔:nice
  • 给自己定个小目标:好
  • 叶舞清风:都是系统自带？
    jianshu_wl:@叶舞清风 嗯嗯，是的。:stuck_out_tongue:
  • 大菠萝_DABLO:好吧！ 没注意。看了半天
  • 大菠萝_DABLO:大兄弟 你这个是不是有错啊？
    大菠萝_DABLO:@jianshu_wl 没有 ProviderPeleaseData 这个变量啊
    大菠萝_DABLO:@jianshu_wl CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData); 这段代码是不是有错
    jianshu_wl:@Im_Small_Potato ?

本文标题：iOS中生成指定大小、指定颜色的二维码和条形码

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