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);
}
// 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];