iOS中生成指定大小、指定顏色的二維碼和條形碼方法詳解

iOS中生成指定大小、指定顏色的二維碼和條形碼方法詳解

iOS7.0之後可以利用系統原生 API 生成二維碼, iOS8.0之後可以生成條形碼, 系統預設生成的顏色是黑色. 在這裡, 利用以下方法可以生成指定大小、指定顏色的二維碼和條形碼, 還可以新增背景顏色、陰影效果, 以下是具體方法.

一. 生成二維碼

Avilable in iOS 7.0 and later

方法如下:


#pragma mark - 生成二維碼
//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;

具體實現如下:


#pragma mark - 生成二維碼
(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 則繪製 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;
}
}
//改變二維碼顏色
(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);
//遍歷畫素, 改變畫素點顏色
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;
}
}
//取出圖片
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;
}
//改變二維碼尺寸大小
(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];
}
//生成最原始的二維碼
(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. 生成條形碼

Avilable in iOS 8.0 and later

方法如下:


#pragma mark - 生成條形碼
//Avilable in iOS 8.0 and later
(UIImage *)barcodeImageWithContent:(NSString *)content
codeImageSize:(CGSize)size
red:(CGFloat)red
green:(CGFloat)green
blue:(CGFloat)blue;

具體實現如下:


#pragma mark - 生成條形碼
(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);
//遍歷畫素, 改變畫素點顏色
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;
}
}
//取出圖片
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;
}
//改變條形碼尺寸大小
(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];
}
//生成最原始的條形碼
(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.測試

主要程式碼如下:


//-----------------------------------二維碼、條形碼測試--------------------------------------------------
//條形碼
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];
//陰影
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];
//二維碼
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
//陰影
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];

執行結果如下:

執行結果