iOS二维码生成中间带图片Logo

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iOS二维码生成中间带图片效果图：

ViewController.h

1 #import <UIKit/UIKit.h>2 @interface ViewController : UIViewController3 @property (strong, nonatomic) IBOutlet UIImageView *imgVQRCode;4 5 @end

ViewController.m

 1 #import "ViewController.h" 2 #import "KMQRCode.h" 3 #import "UIImage+RoundedRectImage.h" 4  5 @interface ViewController () 6 - (void)layoutUI; 7 @end 8  9 @implementation ViewController10 11 - (void)viewDidLoad {12     [super viewDidLoad];13     14     [self layoutUI];15 }16 17 - (void)didReceiveMemoryWarning {18     [super didReceiveMemoryWarning];19     // Dispose of any resources that can be recreated.20 }21 22 - (void)layoutUI {23     //用于生成二维码的字符串source24     NSString *source = @"https://github.com/KenmuHuang";25     26     //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）27     CIImage *imgQRCode = [KMQRCode createQRCodeImage:source];28     29     //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）30     UIImage *imgAdaptiveQRCode = [KMQRCode resizeQRCodeImage:imgQRCode31                                                     withSize:_imgVQRCode.frame.size.width];32     33     //默认产生的黑白色的二维码图片；我们可以让它产生其它颜色的二维码图片，例如：蓝白色的二维码图片34     imgAdaptiveQRCode = [KMQRCode specialColorImage:imgAdaptiveQRCode35                                             withRed:33.036                                               green:114.037                                                blue:237.0]; //0~25538     39     //使用核心绘图框架CG（Core Graphics）对象操作，创建带圆角效果的图片40     UIImage *imgIcon = [UIImage createRoundedRectImage:[UIImage imageNamed:@"QRCode"]41                                               withSize:CGSizeMake(70.0, 93.0)42                                             withRadius:10];43     //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44     imgAdaptiveQRCode = [KMQRCode addIconToQRCodeImage:imgAdaptiveQRCode45                                               withIcon:imgIcon46                                           withIconSize:imgIcon.size];47     48 //    imgAdaptiveQRCode = [KMQRCode addIconToQRCodeImage:imgAdaptiveQRCode49 //                                              withIcon:imgIcon50 //                                             withScale:3];51     52     _imgVQRCode.image = imgAdaptiveQRCode;53     //设置图片视图的圆角边框效果54     _imgVQRCode.layer.masksToBounds = YES;55     _imgVQRCode.layer.cornerRadius = 10.0;56     _imgVQRCode.layer.borderColor = [UIColor lightGrayColor].CGColor;57     _imgVQRCode.layer.borderWidth = 4.0;58 }59 60 @end

UIImage+RoundedRectImage.h

1 #import <UIKit/UIKit.h>2 3 @interface UIImage (RoundedRectImage)4 + (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius;5 6 @end

UIImage+RoundedRectImage.m

 1 #import "UIImage+RoundedRectImage.h" 2  3 @implementation UIImage (RoundedRectImage) 4  5 #pragma mark - Private Methods 6 static void addRoundedRectToPath(CGContextRef contextRef, CGRect rect, float widthOfRadius, float heightOfRadius) { 7     float fw, fh; 8     if (widthOfRadius == 0 || heightOfRadius == 0) 9     {10         CGContextAddRect(contextRef, rect);11         return;12     }13     14     CGContextSaveGState(contextRef);15     CGContextTranslateCTM(contextRef, CGRectGetMinX(rect), CGRectGetMinY(rect));16     CGContextScaleCTM(contextRef, widthOfRadius, heightOfRadius);17     fw = CGRectGetWidth(rect) / widthOfRadius;18     fh = CGRectGetHeight(rect) / heightOfRadius;19     20     CGContextMoveToPoint(contextRef, fw, fh/2);  // Start at lower right corner21     CGContextAddArcToPoint(contextRef, fw, fh, fw/2, fh, 1);  // Top right corner22     CGContextAddArcToPoint(contextRef, 0, fh, 0, fh/2, 1); // Top left corner23     CGContextAddArcToPoint(contextRef, 0, 0, fw/2, 0, 1); // Lower left corner24     CGContextAddArcToPoint(contextRef, fw, 0, fw, fh/2, 1); // Back to lower right25     26     CGContextClosePath(contextRef);27     CGContextRestoreGState(contextRef);28 }29 30 #pragma mark - Public Methods31 + (UIImage *)createRoundedRectImage:(UIImage *)image withSize:(CGSize)size withRadius:(NSInteger)radius {32     int w = size.width;33     int h = size.height;34     35     CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();36     CGContextRef contextRef = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaPremultipliedFirst);37     CGRect rect = CGRectMake(0, 0, w, h);38     39     CGContextBeginPath(contextRef);40     addRoundedRectToPath(contextRef, rect, radius, radius);41     CGContextClosePath(contextRef);42     CGContextClip(contextRef);43     CGContextDrawImage(contextRef, CGRectMake(0, 0, w, h), image.CGImage);44     CGImageRef imageMasked = CGBitmapContextCreateImage(contextRef);45     UIImage *img = [UIImage imageWithCGImage:imageMasked];46     47     CGContextRelease(contextRef);48     CGColorSpaceRelease(colorSpaceRef);49     CGImageRelease(imageMasked);50     return img;51 }52 53 @end

KMQRCode.h

 1 #import <UIKit/UIKit.h> 2  3 @interface KMQRCode : NSObject 4 + (CIImage *)createQRCodeImage:(NSString *)source; 5 + (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size; 6 + (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue; 7 + (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize; 8 + (UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale; 9 10 @end

KMQRCode.m

  1 #import "KMQRCode.h"  2   3 @implementation KMQRCode  4   5 #pragma mark - Private Methods  6 void ProviderReleaseData (void *info, const void *data, size_t size){  7     free((void*)data);  8 }  9  10 #pragma mark - Public Methods 11 + (CIImage *)createQRCodeImage:(NSString *)source { 12     NSData *data = [source dataUsingEncoding:NSUTF8StringEncoding]; 13      14     CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; 15     [filter setValue:data forKey:@"inputMessage"]; 16     [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) 17     return filter.outputImage; 18 } 19  20 + (UIImage *)resizeQRCodeImage:(CIImage *)image withSize:(CGFloat)size { 21     CGRect extent = CGRectIntegral(image.extent); 22     CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); 23     size_t width = CGRectGetWidth(extent) * scale; 24     size_t height = CGRectGetHeight(extent) * scale; 25     CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceGray(); 26      27     CGContextRef contextRef = CGBitmapContextCreate(nil, width, height, 8, 0, colorSpaceRef, (CGBitmapInfo)kCGImageAlphaNone); 28     CIContext *context = [CIContext contextWithOptions:nil]; 29     CGImageRef imageRef = [context createCGImage:image fromRect:extent]; 30     CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone); 31     CGContextScaleCTM(contextRef, scale, scale); 32     CGContextDrawImage(contextRef, extent, imageRef); 33      34     CGImageRef imageRefResized = CGBitmapContextCreateImage(contextRef); 35      36     //Release 37     CGContextRelease(contextRef); 38     CGImageRelease(imageRef); 39     return [UIImage imageWithCGImage:imageRefResized]; 40 } 41  42 + (UIImage *)specialColorImage:(UIImage*)image withRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue { 43     const int imageWidth = image.size.width; 44     const int imageHeight = image.size.height; 45     size_t bytesPerRow = imageWidth * 4; 46     uint32_t* rgbImageBuf = (uint32_t*)malloc(bytesPerRow * imageHeight); 47      48     //Create context 49     CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB(); 50     CGContextRef contextRef = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpaceRef, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast); 51     CGContextDrawImage(contextRef, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage); 52      53     //Traverse pixe 54     int pixelNum = imageWidth * imageHeight; 55     uint32_t* pCurPtr = rgbImageBuf; 56     for (int i = 0; i < pixelNum; i++, pCurPtr++){ 57         if ((*pCurPtr & 0xFFFFFF00) < 0x99999900){ 58             //Change color 59             uint8_t* ptr = (uint8_t*)pCurPtr; 60             ptr[3] = red; //0~255 61             ptr[2] = green; 62             ptr[1] = blue; 63         }else{ 64             uint8_t* ptr = (uint8_t*)pCurPtr; 65             ptr[0] = 0; 66         } 67     } 68      69     //Convert to image 70     CGDataProviderRef dataProviderRef = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData); 71     CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpaceRef, 72                                         kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProviderRef, 73                                         NULL, true, kCGRenderingIntentDefault); 74     CGDataProviderRelease(dataProviderRef); 75     UIImage* img = [UIImage imageWithCGImage:imageRef]; 76      77     //Release 78     CGImageRelease(imageRef); 79     CGContextRelease(contextRef); 80     CGColorSpaceRelease(colorSpaceRef); 81     return img; 82 } 83  84 +(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withIconSize:(CGSize)iconSize { 85     UIGraphicsBeginImageContext(image.size); 86     //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 87     CGFloat widthOfImage = image.size.width; 88     CGFloat heightOfImage = image.size.height; 89     CGFloat widthOfIcon = iconSize.width; 90     CGFloat heightOfIcon = iconSize.height; 91      92     [image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)]; 93     [icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2, 94                                 widthOfIcon, heightOfIcon)]; 95     UIImage *img = UIGraphicsGetImageFromCurrentImageContext(); 96      97     UIGraphicsEndImageContext(); 98     return img; 99 }100 101 +(UIImage *)addIconToQRCodeImage:(UIImage *)image withIcon:(UIImage *)icon withScale:(CGFloat)scale {102     UIGraphicsBeginImageContext(image.size);103     104     //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105     CGFloat widthOfImage = image.size.width;106     CGFloat heightOfImage = image.size.height;107     CGFloat widthOfIcon = widthOfImage/scale;108     CGFloat heightOfIcon = heightOfImage/scale;109     110     [image drawInRect:CGRectMake(0, 0, widthOfImage, heightOfImage)];111     [icon drawInRect:CGRectMake((widthOfImage-widthOfIcon)/2, (heightOfImage-heightOfIcon)/2,112                                 widthOfIcon, heightOfIcon)];113     UIImage *img = UIGraphicsGetImageFromCurrentImageContext();114     115     UIGraphicsEndImageContext();116     return img;117 }118 119 @end

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