一、生成二維碼 CoreImage框架

// 生成二維碼

+ (UIImage *)generateQRCodeWithInputMessage:(NSString *)inputMessage
                                      Width:(CGFloat)width
                                     Height:(CGFloat)height{
    NSData *inputData = [inputMessage dataUsingEncoding:NSUTF8StringEncoding];
    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    [filter setValue:inputData forKey:@"inputMessage"];
    //    [filter setValue:@"H" forKey:@"inputCorrectionLevel"]; // 設(shè)置二維碼不同級(jí)別的容錯(cuò)率

    CIImage *ciImage = filter.outputImage;
    // 消除模糊
    CGFloat scaleX = MIN(width, height)/ciImage.extent.size.width;
    CGFloat scaleY = MIN(width, height)/ciImage.extent.size.height;
    ciImage = [ciImage imageByApplyingTransform:CGAffineTransformScale(CGAffineTransformIdentity, scaleX, scaleY)];
    UIImage *returnImage = [UIImage imageWithCIImage:ciImage];
    return returnImage;
}

二、生成條形碼 CIFilter

// 生成條形碼

+ (UIImage *)generateCode128:(NSString *)code size:(CGSize)size {
     NSData *codeData = [code dataUsingEncoding:NSUTF8StringEncoding];
 //  使用CICode128BarcodeGenerator創(chuàng)建filter
     CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator" withInputParameters:@{@"inputMessage": codeData, @"inputQuietSpace": @.0}];
 // 由filter.outputImage直接轉(zhuǎn)成的UIImage不太清楚，需要做高清處理
     UIImage *codeImage = [QiCodeManager scaleImage:filter.outputImage toSize:size];
     return codeImage;
}

// 縮放圖片(生成高質(zhì)量圖片）

+ (UIImage *)scaleImage:(CIImage *)image toSize:(CGSize)size {
 //! 將CIImage轉(zhuǎn)成CGImageRef
    CGRect integralRect = image.extent;// CGRectIntegral(image.extent);// 將rect取整后返回，origin取舍，size取入
    CGImageRef imageRef = [[CIContext context] createCGImage:image fromRect:integralRect];
 //! 創(chuàng)建上下文
    CGFloat sideScale = fminf(size.width / integralRect.size.width, size.width / integralRect.size.height) * [UIScreen mainScreen].scale;// 計(jì)算需要縮放的比例
    size_t contextRefWidth = ceilf(integralRect.size.width * sideScale);
    size_t contextRefHeight = ceilf(integralRect.size.height * sideScale);
    CGContextRef contextRef = CGBitmapContextCreate(nil, contextRefWidth, contextRefHeight, 8, 0, CGColorSpaceCreateDeviceGray(), (CGBitmapInfo)kCGImageAlphaNone);// 灰度、不透明
    CGContextSetInterpolationQuality(contextRef, kCGInterpolationNone);// 設(shè)置上下文無插值
    CGContextScaleCTM(contextRef, sideScale, sideScale);// 設(shè)置上下文縮放
    CGContextDrawImage(contextRef, integralRect, imageRef);// 在上下文中的integralRect中繪制imageRef
 //! 從上下文中獲取CGImageRef
    CGImageRef scaledImageRef = CGBitmapContextCreateImage(contextRef);
    CGContextRelease(contextRef);
    CGImageRelease(imageRef);
 //! 將CGImageRefc轉(zhuǎn)成UIImage
    UIImage *scaledImage = [UIImage imageWithCGImage:scaledImageRef scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];
    return scaledImage;
}

// 合成圖片（code+logo）

+ (UIImage *)combinateCodeImage:(UIImage *)codeImage andLogo:(UIImage *)logo {
    UIGraphicsBeginImageContextWithOptions(codeImage.size, YES, [UIScreen mainScreen].scale);
 // 將codeImage畫到上下文中
    [codeImage drawInRect:(CGRect){.0, .0, codeImage.size.width, codeImage.size.height}];
 // 定義logo的繪制參數(shù)
    CGFloat logoSide = fminf(codeImage.size.width, codeImage.size.height) / 4;
    CGFloat logoX = (codeImage.size.width - logoSide) / 2;
    CGFloat logoY = (codeImage.size.height - logoSide) / 2;
    CGRect logoRect = (CGRect){logoX, logoY, logoSide, logoSide};
    UIBezierPath *cornerPath = [UIBezierPath bezierPathWithRoundedRect:logoRect cornerRadius:logoSide / 5];
    [cornerPath setLineWidth:2.0];
    [[UIColor whiteColor] set];
    [cornerPath stroke];
    [cornerPath addClip];
 // 將logo畫到上下文中
    [logo drawInRect:logoRect];
 // 從上下文中讀取image
    codeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return codeImage;
}

原地址 http://www.itdecent.cn/p/81e125a04cae

iOS 掃描相冊圖片二維碼

http://www.itdecent.cn/p/cf65be0649d9