UIImage+Addition

来源：互联网发布：少儿编程课程要会什么编辑：程序博客网时间：2024/05/24 06:39

根据字符串生成二维码

声明.h

/** *  根据字符串生成二维码 * *  @param content 需要生成二维码的字符串 * *  @return 生成二维码图片 */+ (UIImage *)qrImageWithContent:(NSString *)content;/** *  根据字符串和size生成二维码 * *  @param content 需要生成二维码的字符串 * *  @return 生成二维码图片 */+ (UIImage *)qrImageWithContent:(NSString *)content size:(CGFloat)size;/** *  @param content 需要生成二维码的字符串 *  @param size    生成的二维码的清晰度(图片质量大小)100+ *  @param red,green,blue     生成的二维码的颜色 *  @return 生成二维码图片 */+ (UIImage *)qrImageWithContent:(NSString *)content size:(CGFloat)size red:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue;/** *  @param content 需要生成二维码的字符串 *  @param logo    中间的logo图片 *  @param size    生成的二维码的清晰度(图片质量大小)100+ *  @param red,green,blue  生成的二维码的颜色 *  @return 生成二维码图片 */+ (UIImage *)qrImageWithContent:(NSString *)content logo:(UIImage *)logo size:(CGFloat)size red:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue;

实现.m

void ProviderReleaseData (void *info, const void *data, size_t size){    free((void*)data);}+ (CIImage *)qrWithContent:(NSString *)content {    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    NSData *stringData = [content dataUsingEncoding:NSUTF8StringEncoding];    [qrFilter setValue:stringData forKey:@"inputMessage"];    [qrFilter setValue:@"H" forKey:@"inputCorrectionLevel"];    CIImage *image = qrFilter.outputImage;    return image;}+ (UIImage *)qrImageWithContent:(NSString *)content size:(CGFloat)size  {    CIImage *image = [UIImage qrWithContent:content];    CGRect extent = CGRectIntegral(image.extent);    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));    // 创建bitmap;    size_t width = CGRectGetWidth(extent) * scale;    size_t height = CGRectGetHeight(extent) * scale;    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);    CIContext *context = [CIContext contextWithOptions:nil];    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);    CGContextScaleCTM(bitmapRef, scale, scale);    CGContextDrawImage(bitmapRef, extent, bitmapImage);    // 保存bitmap到图片    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);    CGContextRelease(bitmapRef);    CGImageRelease(bitmapImage);    return [UIImage imageWithCGImage:scaledImage];}+ (UIImage *)qrImageWithContent:(NSString *)content size:(CGFloat)size red:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue {    UIImage *image = [UIImage qrImageWithContent:content size:size];    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);    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    CGContextRef context = CGBitmapContextCreate(rgbImageBuf, imageWidth, imageHeight, 8, bytesPerRow, colorSpace,  kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipLast);    CGContextDrawImage(context, CGRectMake(0, 0, imageWidth, imageHeight), image.CGImage);    // 遍历像素    int pixelNum = imageWidth * imageHeight;    uint32_t* pCurPtr = rgbImageBuf;    for (int i = 0; i < pixelNum; i++, pCurPtr++){        if ((*pCurPtr & 0xFFFFFF00) < 0x99999900)    // 将白色变成透明        {            // 改成下面的代码，会将图片转成想要的颜色            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;        }    }    // 输出图片    CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, rgbImageBuf, bytesPerRow * imageHeight, ProviderReleaseData);    CGImageRef imageRef = CGImageCreate(imageWidth, imageHeight, 8, 32, bytesPerRow, colorSpace,                                        kCGImageAlphaLast | kCGBitmapByteOrder32Little, dataProvider,                                        NULL, true, kCGRenderingIntentDefault);    CGDataProviderRelease(dataProvider);    UIImage* resultUIImage = [UIImage imageWithCGImage:imageRef];    // 释放内存空间    CGImageRelease(imageRef);    CGContextRelease(context);    CGColorSpaceRelease(colorSpace);    return resultUIImage;}+ (UIImage *)qrImageWithContent:(NSString *)content logo:(UIImage *)logo size:(CGFloat)size red:(NSInteger)red green:(NSInteger)green blue:(NSInteger)blue {    UIImage* resultUIImage = [self qrImageWithContent:content size:size red:red green:green blue:blue];    // 添加logo    CGFloat logoW = resultUIImage.size.width / 5.;    CGRect logoFrame = CGRectMake(logoW * 2, logoW * 2, logoW, logoW);    UIGraphicsBeginImageContext(resultUIImage.size);    [resultUIImage drawInRect:CGRectMake(0, 0, resultUIImage.size.width, resultUIImage.size.height)];    [logo drawInRect:logoFrame];    UIImage *kk = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return kk;}+ (UIImage *)qrImageWithContent:(NSString *)content {    NSData *stringData = [content dataUsingEncoding:NSUTF8StringEncoding];    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    [qrFilter setValue:stringData forKey:@"inputMessage"];    [qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"];    CIImage *qrImage = qrFilter.outputImage;    CGSize size = CGSizeMake(300, 300);    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];    UIGraphicsBeginImageContext(size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetInterpolationQuality(context, kCGInterpolationNone);    CGContextScaleCTM(context, 1, -1);    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    CGImageRelease(cgImage);    return codeImage;}

二维码

图片处理

声明.h

/** *  根据给定的颜色生成 纯色图片 * *  @param color 给定的颜色 *  @param size  生成图片大小 * *  @return 生成图片 */+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size;/** *  把view转成图片 * *  @param view 需要生成图片的view * *  @return 生成图片 */+ (UIImage *)imageForView:(UIView *)view;/** *  把view转成data * *  @param view 需要生成图片的view * *  @return 生成data */+ (NSData *)imageToDataForView:(UIView *)view;/** *  把图片转换成圆形图片 * *  @param imageName       图片名字 *  @param imageSizeOrZero 生成的图片尺寸 * *  @return 生成图片 */+ (instancetype)circleImageWithName:(NSString *)imageName imageSize:(CGSize)imageSizeOrZero ;/** *  把图片转换成base64字符串 * *  @param image 需要生成的图片 * *  @return 生成的base64字符串 */+ (NSString *)base64EncodedStringByImage:(UIImage *)image;

实现.m

+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size{    CGRect rect = CGRectMake(0, 0, size.width, size.height);    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetFillColorWithColor(context,                                   color.CGColor);    CGContextFillRect(context, rect);    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return img;}+ (UIImage *)imageForView:(UIView *)view{    UIGraphicsBeginImageContext(view.bounds.size);    [view.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return image;}+ (NSData *)imageToDataForView:(UIView *)view {    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);    [view.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return UIImageJPEGRepresentation(image, 0);}+ (instancetype)circleImageWithName:(NSString *)imageName imageSize:(CGSize)imageSizeOrZero  {    //1. 加载原图片    UIImage *originalImage = [UIImage imageNamed:imageName];    CGSize size = !CGSizeEqualToSize(imageSizeOrZero, CGSizeZero) ? imageSizeOrZero : originalImage.size;    //2. 开启上下文    CGSize imageS = CGSizeMake(size.width, size.height);    UIGraphicsBeginImageContextWithOptions(imageS, NO, 2);    //3. 取得当前上下文    CGContextRef ctx = UIGraphicsGetCurrentContext();    //4. 画圆    CGFloat bigRadius = size.width * 0.5;    CGContextAddArc(ctx, bigRadius, bigRadius, bigRadius, 0, M_PI * 2, 0);    CGContextFillPath(ctx);    CGContextClip(ctx);    //5. 画图    [originalImage drawInRect:CGRectMake(0, 0, size.width, size.height)];    //6. 取图    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return newImage;}+ (NSString *)base64EncodedStringByImage:(UIImage *)image {    NSData *data = UIImageJPEGRepresentation(image, 1);    NSString *iamgeData = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];    return iamgeData;}

0 0