iOS中生成指定大小、指定顏色的二維碼和條形碼方法詳解

2020-07-26 03:00:14

字體：大中小

來源：轉載

供稿：網友

iOS7.0之后可以利用系統原生 API 生成二維碼, iOS8.0之后可以生成條形碼, 系統默認生成的顏色是黑色. 在這里, 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, 還可以添加背景顏色、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);  //遍歷像素, 改變像素點顏色  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);  //遍歷像素, 改變像素點顏色  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

主要代碼如下:

//-----------------------------------二維碼、條形碼測試--------------------------------------------------  //條形碼  UIImage *barImage = [Utilities barcodeImageWithContent:@"123456"codeImageSize:CGSizeMake(300, 90)red:0                        green:0.4blue: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:200logo:[UIImage imageNamed:@"logo.png"]logoFrame:CGRectMake(75, 75, 50, 50)red:0.0fgreen:139/255.0fblue: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];

運行結果如下: