二维码和URL的相互转换

来源：互联网发布：mac爱奇艺编辑：程序博客网时间：2024/05/16 18:46
用URL生成二维码，也可以通过二维码获取URL（可用于长按识别二维码）
#pragma mark - 二维码转换// url生成二维码+ (UIImage *)getQRCodeWithUrlString:(NSString *)urlStr size:(CGFloat)size{    // 1.创建过滤器    CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];    // 2.恢复默认    [filter setDefaults];    // 3.给过滤器添加数据(正则表达式/账号和密码)    NSData *data = [urlStr dataUsingEncoding:NSUTF8StringEncoding];    [filter setValue:data forKeyPath:@"inputMessage"];    // 4.获取输出的二维码    CIImage *outputImage = [filter outputImage];    // 5.将CIImage转换成UIImage，并放大显示    CGRect extent = CGRectIntegral(outputImage.extent);    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));    // 5.1.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:outputImage fromRect:extent];    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);    CGContextScaleCTM(bitmapRef, scale, scale);    CGContextDrawImage(bitmapRef, extent, bitmapImage);    // 5.2.保存bitmap到图片    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);    CGContextRelease(bitmapRef);    CGImageRelease(bitmapImage);    return [UIImage imageWithCGImage:scaledImage];}/** *  从照片中直接识别二维码 *  @param myQRCode    二维码包含的内容 */- (void)readQRCodeFromImageWithmyQRCode:(void(^)(NSString *qrString,NSError *error))myQRCode{    if (!self)    {        myQRCode(nil,[NSError errorWithDomain:@"未传入图片" code:0 userInfo:nil]);        return;    }        CIContext *context = [CIContext contextWithOptions:nil];    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:context options:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];    CIImage *image = [CIImage imageWithCGImage:self.CGImage];    NSArray *features = [detector featuresInImage:image];    if (features.count)    {        CIQRCodeFeature *feature = [features firstObject];                NSString *result = feature.messageString;                myQRCode(result,nil);    }    else    {        myQRCode(nil,[NSError errorWithDomain:@"未能识别出二维码" code:0 userInfo:nil]);        return;    }}
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