iOS开发 二维码扫描和生成

一.二维码扫描

1.第一种方法:需要引入ZXingObjC(系统版本是iOS 8以下的)

/** *  从图片中读取二维码  这是iOS7以后的方法 * *  @param qrImage 一张二维码图片 * *  @return 二维码信息 */+ (NSString *)scQRReaderForImage:(UIImage *)qrImage{    if (qrImage == nil) {        return nil;    }    ZXLuminanceSource *source = [[ZXCGImageLuminanceSource alloc] initWithCGImage:qrImage.CGImage];    ZXBinaryBitmap *bitmap = [ZXBinaryBitmap binaryBitmapWithBinarizer:[ZXHybridBinarizer binarizerWithSource:source]];        NSError *error = nil;        ZXDecodeHints *hints = [ZXDecodeHints hints];        ZXMultiFormatReader *reader = [ZXMultiFormatReader reader];    ZXResult *result = [reader decode:bitmap                                hints:hints                                error:&error];    // The coded result as a string. The raw data can be accessed with    // result.rawBytes and result.length.    return result.text;}

2.第二种方法:(系统版本是iOS8以上的)

/** *  从图片中读取二维码  这是iOS8以后的方法 * *  @param qrImage 一张二维码图片 * *  @return 二维码信息 */+ (NSString *)scQRReaderiOS8ForImage:(UIImage *)qrImage NS_AVAILABLE_IOS(8_0){    if (qrImage == nil) {        return nil;    }    UIImage *srcImage = qrImage;    CIContext *context = [CIContext contextWithOptions:nil];    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];    CIImage *image = [CIImage imageWithCGImage:srcImage.CGImage];    NSArray *features = [detector featuresInImage:image];    CIQRCodeFeature *feature = [features firstObject];    NSString *result = feature.messageString;    return result;}

二.二维码生成

1.第一种方法:需要引入ZXingObjC

/** *  根据给定的字符串生成一个给定尺寸的二维码image * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 * *  @return 二维码 */+ (UIImage *)zxQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize{    if (qrString.length == 0) {        return nil;    }    if (imageSize < 10.0) {        return nil;    }    NSError *error = nil;    ZXMultiFormatWriter *writer = [ZXMultiFormatWriter writer];    ZXBitMatrix *result = [writer encode:qrString                                  format:kBarcodeFormatQRCode                                   width:imageSize                                  height:imageSize                                   error:&error];    if (result) {        CGImageRef image = [[ZXImage imageWithMatrix:result] cgimage];        UIImage *qrImage = [UIImage imageWithCGImage:image];        return qrImage;    }    return nil;}

2.第二种方法:需要调第五种方法

/** *  根据给定的字符串生成一个给定尺寸的二维码image * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 * *  @return 二维码 */+ (UIImage *)scQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize{    return [self scQRCodeForString:qrString size:imageSize fillColor:[UIColor blackColor] backColor:[UIColor whiteColor]];}

3.第三种方法:需要调第五种方法

/** *  根据给定的字符串生成一个给定尺寸和填充颜色的二维码image * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 *  @param fillColor 二维码填充颜色 * *  @return 二维码 */+ (UIImage *)scQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize fillColor:(UIColor *)fillColor{    return [self scQRCodeForString:qrString size:imageSize fillColor:fillColor backColor:[UIColor whiteColor]];}

4.第四种方法:需要调第五种方法

/** *  根据给定的字符串生成一个给定尺寸和背景颜色的二维码image * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 *  @param fillColor 二维码背景颜色 * *  @return 二维码 */+ (UIImage *)scQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize backColor:(UIColor *)backColor{    return [self scQRCodeForString:qrString size:imageSize fillColor:[UIColor blackColor] backColor:backColor];}

5.第五种方法:

/** *  根据给定的字符串生成一个给定尺寸和给定颜色的二维码image * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 *  @param fillColor 二维码填充颜色 *  @param backColor 二维码背景颜色 * *  @return 二维码 */+ (UIImage *)scQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize fillColor:(UIColor *)fillColor backColor:(UIColor *)backColor{    if (qrString.length == 0) {        return nil;    }    if (imageSize < 10.0) {        return nil;    }    if (!fillColor) {        fillColor = [UIColor blackColor];    }    if (!backColor) {        backColor = [UIColor whiteColor];    }    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];        //生成    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    [qrFilter setValue:stringData forKey:@"inputMessage"];    [qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"];        //上色    CIFilter *colorFilter = [CIFilter filterWithName:@"CIFalseColor"                                       keysAndValues:                             @"inputImage",qrFilter.outputImage,                             @"inputColor0",[CIColor colorWithCGColor:fillColor.CGColor],                             @"inputColor1",[CIColor colorWithCGColor:backColor.CGColor],                             nil];        CIImage *qrImage = colorFilter.outputImage;        //绘制    CGSize imgSize = CGSizeMake(imageSize, imageSize);    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:qrImage fromRect:qrImage.extent];    UIGraphicsBeginImageContext(imgSize);    CGContextRef context = UIGraphicsGetCurrentContext();    CGContextSetInterpolationQuality(context, kCGInterpolationNone);    CGContextScaleCTM(context, 1.0, -1.0);    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);    UIImage *codeImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    CGImageRelease(cgImage);    return codeImage;}

6.第六种方法:生成中间有logo的二维码

/** *  生成中间有logo的二维码 * *  @param qrString  二维码的内容 *  @param imageSize 二维码生成后的尺寸大小 *  @param fillColor 二维码填充颜色 *  @param backColor 二维码背景颜色 *  @param subImage  二维码的子图 * *  @return 带有子图的二维码 */+ (UIImage *)scQRCodeForString:(NSString *)qrString size:(CGFloat)imageSize fillColor:(UIColor *)fillColor backColor:(UIColor *)backColor subImage:(UIImage *)subImage{    UIImage *qrImage = [QRUtil scQRCodeForString:qrString size:imageSize fillColor:fillColor backColor:backColor];    if (subImage) {        return [self addSubImage:qrImage sub:subImage];    }    return qrImage;}

#pragma mark - private+ (UIImage *)addSubImage:(UIImage *)img sub:(UIImage *)subImage{    //get image width and height    NSInteger w = img.size.width;    NSInteger h = img.size.height;    NSInteger subWidth = subImage.size.width;    NSInteger subHeight = subImage.size.height;    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    //create a graphic context with CGBitmapContextCreate    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);    CGContextDrawImage(context, CGRectMake( (w-subWidth)/2, (h - subHeight)/2, subWidth, subHeight), [subImage CGImage]);    CGImageRef imageMasked = CGBitmapContextCreateImage(context);    CGContextRelease(context);    CGColorSpaceRelease(colorSpace);    return [UIImage imageWithCGImage:imageMasked];}