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);
}
