iOS 生成二维码带图片

最新推荐文章于 2022-05-18 11:18:13 发布

今天明天_007

最新推荐文章于 2022-05-18 11:18:13 发布

阅读量1.7k

点赞数

CC 4.0 BY-SA版权

分类专栏： OC 文章标签：生成二维码带图片

本文链接：https://blog.youkuaiyun.com/sinat_35710100/article/details/52604935

OC 专栏收录该内容

48 篇文章

订阅专栏

本文介绍了一个Objective-C类库，用于创建包含图标并可调整颜色及尺寸的二维码。提供了详细的代码实现，包括生成二维码、调整二维码大小、改变颜色、添加图标等步骤。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

#import <CoreImage/CoreImage.h>

@interface KMQRCode : NSObject

+ (CIImage *)createQRCodeImage:(NSString *)source;

+ (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size;

+ (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue;

+ (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize;

+ (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale;

@end

#import "KMQRCode.h"

@implementation KMQRCode

#pragma mark - Private Methods

void ProviderReleaseData (void *info, const void *data, size_t size){

free((void*)data);

}

#pragma mark - Public Methods

+ (CIImage *)createQRCodeImage:(NSString *)source {

NSData *data = [source dataUsingEncoding:NSUTF8StringEncoding];

CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

[filter setValue:data forKey:@"inputMessage"];

[filter setValue:@"Q" forKey:@"inputCorrectionLevel"]; //设置纠错等级越高；即识别越容易，值可设置为L(Low) | M(Medium) | Q | H(High)

return filter.outputImage;

}

+ (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size {

CGRect extent = CGRectIntegral(image.extent);

CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));

size_t width = CGRectGetWidth(extent) * scale;

size_t height = CGRectGetHeight(extent) * scale;

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();

CGContextRef contextRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone);

CIContext *context = [CIContext contextWithOptions:nil];

CGImageRef imageRef = [context createCGImage:image fromRect:extent];

CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone);

CGContextScaleCTM(contextRef, scale, scale);

CGContextDrawImage(contextRef, extent, imageRef);

CGImageRef imageRefResized = CGBitmapContextCreateImage(contextRef);

//Release

CGContextRelease(contextRef);

CGImageRelease(imageRef);

return [UIImage imageWithCGImage:imageRefResized];

}

+ (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue {

const int imageWidth = image.size.width;

const int imageHeight = image.size.height;

size_t bytesPerRow = imageWidth * 4;

uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight);

//Create context

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();

CGContextRef contextRef = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpaceRef, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);

CGContextDrawImage(contextRef, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);

//Traverse pixe

int pixelNum = imageWidth * imageHeight;

uint32_t* pCurPtr = rgbImageBuf;

for (int i = 0; i < pixelNum; i++, pCurPtr++){

if ((*pCurPtr & 0xFFFFFF00) < 0x99999900){

//Change color

uint8_t* ptr = (uint8_t*)pCurPtr;

ptr[3] = red; //0~255

ptr[2] = green;

ptr[1] = blue;

}else{

uint8_t* ptr = (uint8_t*)pCurPtr;

ptr[0] = 0;

}

//Convert to image

CGDataProviderRef dataProviderRef = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);

CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpaceRef,

kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProviderRef,

NULL, true, kCGRenderingIntentDefault);

CGDataProviderRelease(dataProviderRef);

UIImage* img = [UIImage imageWithCGImage:imageRef];

//Release

CGImageRelease(imageRef);

CGContextRelease(contextRef);

CGColorSpaceRelease(colorSpaceRef);

return img;

}

+(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize {

UIGraphicsBeginImageContext(image.size);

//通过两张图片进行位置和大小的绘制，实现两张图片的合并；其实此原理做法也可以用于多张图片的合并

CGFloat widthOfImage = image.size.width;

CGFloat heightOfImage = image.size.height;

CGFloat widthOfIcon = iconSize.width;

CGFloat heightOfIcon = iconSize.height;

[image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];

[icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,

widthOfIcon, heightOfIcon)];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}

+(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale {

UIGraphicsBeginImageContext(image.size);

//通过两张图片进行位置和大小的绘制，实现两张图片的合并；其实此原理做法也可以用于多张图片的合并

CGFloat widthOfImage = image.size.width;

CGFloat heightOfImage = image.size.height;

CGFloat widthOfIcon = widthOfImage/scale;

CGFloat heightOfIcon = heightOfImage/scale;

[image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];

[icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,

widthOfIcon, heightOfIcon)];

UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return img;

}

@end

#import <UIKit/UIKit.h>

@interface UIImage (RoundedRectImage)

+ (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius;

@end

#import "UIImage+RoundedRectImage.h"

@implementation UIImage (RoundedRectImage)

#pragma mark - Private Methods

static void addRoundedRectToPath(CGContextRef contextRef, CGRect rect, float widthOfRadius, float heightOfRadius) {

float fw, fh;

if (widthOfRadius == 0 || heightOfRadius == 0)

{

CGContextAddRect(contextRef, rect);

return;

}

CGContextSaveGState(contextRef);

CGContextTranslateCTM(contextRef, CGRectGetMinX(rect), CGRectGetMinY(rect));

CGContextScaleCTM(contextRef, widthOfRadius, heightOfRadius);

fw = CGRectGetWidth(rect) / widthOfRadius;

fh = CGRectGetHeight(rect) / heightOfRadius;

CGContextMoveToPoint(contextRef, fw, fh/2); // Start at lower right corner

CGContextAddArcToPoint(contextRef, fw, fh, fw/2, fh, 1); // Top right corner

CGContextAddArcToPoint(contextRef, 0, fh, 0, fh/2, 1); // Top left corner

CGContextAddArcToPoint(contextRef, 0, 0, fw/2, 0, 1); // Lower left corner

CGContextAddArcToPoint(contextRef, fw, 0, fw, fh/2, 1); // Back to lower right

CGContextClosePath(contextRef);

CGContextRestoreGState(contextRef);

}

#pragma mark - Public Methods1

+ (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius {

int w = size.width;

int h = size.height;

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();

CGContextRef contextRef = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);

CGRect rect = CGRectMake(0, 0, w, h);

CGContextBeginPath(contextRef);

addRoundedRectToPath(contextRef, rect, radius, radius);

CGContextClosePath(contextRef);

CGContextClip(contextRef);

CGContextDrawImage(contextRef, CGRectMake(0, 0, w, h), image.CGImage);

CGImageRef imageMasked = CGBitmapContextCreateImage(contextRef);

UIImage *img = [UIImage imageWithCGImage:imageMasked];

CGContextRelease(contextRef);

CGColorSpaceRelease(colorSpaceRef);

CGImageRelease(imageMasked);

return img;

}

@end

使用

//用于生成二维码的字符串source

NSString *source = @"https://github.com/KenmuHuang";

CIImage *imgQRCode = [KMQRCode createQRCodeImage:source];

UIImage *imgAdaptiveQRCode = [KMQRCode resizeQRCodeImage:imgQRCode

withSize:_imgVQRCode.frame.size.width];

UIImage *imgIcon = [UIImage createRoundedRectImage:[UIImage imageNamed:@"logo"]

withSize:CGSizeMake(70, 70)

withRadius:10];

imgAdaptiveQRCode = [KMQRCode addIconToQRCodeImage:imgAdaptiveQRCode

withIcon:imgIcon

withIconSize:imgIcon.size];

_imgVQRCode.image = imgAdaptiveQRCode;