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)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

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