SYCreateQRCode.h
#import <Foundation/Foundation.h>
@interfaceSYCreateQRCode :NSObject
/**
生成二维码图片
@param string 二维码包含的信息
@return 生成的二维码拖图片
*/
+(UIImage*)createCodeImageWithString:(NSString*)string;
/**
生成的二维码图片 使用iOS 7后的CIFilter对象操作，生成二维码图片imgQRCode（会拉伸图片，比较模糊，效果不佳）
@param string 二维码包含的信息
@return 生成的二维码图片
*/
+(CIImage*)createCIFileterCodeImageWithString:(NSString*)string;
/**
使用核心绘图框架CG（Core Graphics）对象操作，进一步针对大小生成二维码图片imgAdaptiveQRCode（图片大小适合，清晰，效果好）
Core Image提供了为图片分析常见缺陷并自动调整修复的方法. 提供一系列用来纠正这些不足的滤镜. 通过为滤镜预设相关值, 实现如变更色调, 饱合度, 对比度, 阴影, 去除红眼或其它闪光伪迹, 来提高图片的质量.
@param image CIImage
@param size 图片大小
@return 生成的二维码图片
*/
+(UIImage*)createCodeImageWithImage:(CIImage*)image withSize:(CGFloat)size;
/**
将默认产生的黑白色的二维码图片生成其它颜色的二维码图片
@param image 二维码图片
@param red 红色（0~255）
@param green 绿色（0~255）
@param blue 蓝色（0~255）
@return 重新生成的二维码图片
*/
+(UIImage*)createCodeImageWithImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue;
//给二维码添加logo的2个方法
///使用核心绘图框架CG（Core Graphics）对象操作，合并二维码图片和用于中间显示的图标图片
/**
自定义中间图标的大小
@param image 生成的二维码图片
@param icon 中间图片
@param iconSize 图片的大小
@return 合并后的二维码
*/
+ (UIImage*)addIconToCodeImage:(UIImage*)image withIcon:(UIImage*)icon withIconSize:(CGSize)iconSize;
/**
按比例设置中间图片的大小
@param image 生成的二维码图片
@param icon 中间图片的大小
@param scale 图片的比例 (原图/现图 = scale)
@return 合并后的二维码
*/
+ (UIImage*)addIconToCodeImage:(UIImage*)image withIcon:(UIImage*)icon withScale:(CGFloat)scale;
@end
SYCreateQRCode.m
#import "SYCreateQRCode.h"
voidProviderReleaseData (void*info,constvoid*data,size_tsize){
free((void*)data);
}
@implementation SYCreateQRCode
+(UIImage*)createCodeImageWithString:(NSString*)string{
if([stringisEqualToString:@""]) {
returnnil;
}else{
//二维码滤镜
CIFilter*filter = [CIFilterfilterWithName:@"CIQRCodeGenerator"];
//恢复滤镜的默认属性
[filtersetDefaults];
//将字符串转换成NSData
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
//通过KVO设置滤镜inputMessage数据
[filtersetValue:dataforKey:@"inputMessage"];
//获得滤镜输出的图像
CIImage*outImage = [filteroutputImage];
//将CIImage转换成UIImage,并放大显示
UIImage *image = [self createNonInterpolatedUIImageFormCIImage:outImage withSize:200];
returnimage;
}
}
+(CIImage*)createCIFileterCodeImageWithString:(NSString*)string{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[filtersetValue:dataforKey:@"inputMessage"];
[filtersetValue:@"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)
returnfilter.outputImage;
}
+(UIImage*)createCodeImageWithImage:(CIImage*)image withSize:(CGFloat)size{
CGRectextent =CGRectIntegral(image.extent);
CGFloatscale =MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
size_twidth =CGRectGetWidth(extent) * scale;
size_theight =CGRectGetHeight(extent) * scale;
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray();
CGContextRefcontextRef =CGBitmapContextCreate(nil, width, height,8,0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone);
CIContext*context = [CIContextcontextWithOptions:nil];
CGImageRefimageRef = [contextcreateCGImage:imagefromRect:extent];
CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone);
CGContextScaleCTM(contextRef, scale, scale);
CGContextDrawImage(contextRef, extent, imageRef);
CGImageRefimageRefResized =CGBitmapContextCreateImage(contextRef);
//Release
CGContextRelease(contextRef);
CGImageRelease(imageRef);
return[UIImageimageWithCGImage:imageRefResized];
}
+(UIImage*)createCodeImageWithImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue{
constintimageWidth = image.size.width;
constintimageHeight = image.size.height;
size_tbytesPerRow = 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
intpixelNum = imageWidth * imageHeight;
uint32_t* pCurPtr = rgbImageBuf;
for(inti =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);
CGImageRefimageRef =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);
returnimg;
}
+(UIImage*)addIconToCodeImage:(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
CGFloatwidthOfImage = image.size.width;
CGFloatheightOfImage = image.size.height;
CGFloatwidthOfIcon = iconSize.width;
CGFloatheightOfIcon = iconSize.height;
[imagedrawInRect:CGRectMake(0,0, widthOfImage, heightOfImage)];
[icondrawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,widthOfIcon, heightOfIcon)];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimg;
}
+(UIImage*)addIconToCodeImage:(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
CGFloatwidthOfImage = image.size.width;
CGFloatheightOfImage = image.size.height;
CGFloatwidthOfIcon = widthOfImage/scale;
CGFloatheightOfIcon = heightOfImage/scale;
[imagedrawInRect:CGRectMake(0,0, widthOfImage, heightOfImage)];
[icondrawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,
widthOfIcon, heightOfIcon)];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnimg;
}
//改变二维码大小
+ (UIImage*)createNonInterpolatedUIImageFormCIImage:(CIImage*)image withSize:(CGFloat) size {
CGRectextent =CGRectIntegral(image.extent);
CGFloatscale =MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
// 创建bitmap;
size_twidth =CGRectGetWidth(extent) * scale;
size_theight =CGRectGetHeight(extent) * scale;
CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
CGContextRefbitmapRef =CGBitmapContextCreate(nil, width, height,8,0, cs, (CGBitmapInfo)kCGImageAlphaNone);
CIContext*context = [CIContextcontextWithOptions:nil];
CGImageRefbitmapImage = [contextcreateCGImage:imagefromRect:extent];
CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);
// 保存bitmap到图片
CGImageRefscaledImage =CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return[UIImageimageWithCGImage:scaledImage];
}
@end
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