iOS 生成二维码带图片

#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 = [sourcedataUsingEncoding:NSUTF8StringEncoding];

    

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

    [filter setValue:dataforKey:@"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 = [CIContextcontextWithOptions:nil];

    CGImageRef imageRef = [contextcreateCGImage:image fromRect:extent];

    CGContextSetInterpolationQuality(contextRef,kCGInterpolationNone);

    CGContextScaleCTM(contextRef, scale, scale);

    CGContextDrawImage(contextRef, extent, imageRef);

    

    CGImageRef imageRefResized =CGBitmapContextCreateImage(contextRef);

    

    //Release

    CGContextRelease(contextRef);

    CGImageRelease(imageRef);

    return [UIImageimageWithCGImage:imageRefResized];

}

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

    constint imageWidth = image.size.width;

    constint 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 = [UIImageimageWithCGImage: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 = [UIImageimageWithCGImage: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 = [KMQRCodecreateQRCodeImage:source];

    

    UIImage *imgAdaptiveQRCode = [KMQRCoderesizeQRCodeImage:imgQRCode

                                                    withSize:_imgVQRCode.frame.size.width];

    UIImage *imgIcon = [UIImagecreateRoundedRectImage:[UIImageimageNamed:@"logo"]

                                              withSize:CGSizeMake(70,70)

                                            withRadius:10];

    imgAdaptiveQRCode = [KMQRCodeaddIconToQRCodeImage:imgAdaptiveQRCode

                                              withIcon:imgIcon

                                          withIconSize:imgIcon.size];

    

    

    _imgVQRCode.image = imgAdaptiveQRCode;