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iOS中url生成二维码

iOS中url生成二维码

作者: 文扉Song | 来源:发表于2018-03-02 15:15 被阅读169次
    // 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)
    NSString *dataString = url;
    NSData *data = [dataString dataUsingEncoding:NSUTF8StringEncoding];
    [filter setValue:data forKey:@"inputMessage"];
    
    // 4.获取输出的二维码
    CIImage *outputImage = [filter outputImage];
    
    //m_codeView.image = [UIImage imageWithCIImage:outputImage];
    // 5.显示二维码
    m_codeView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];
    
    //6.添加长按手势
    UILongPressGestureRecognizer *gesture=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longPress:)];
    gesture.minimumPressDuration=1.0f;
    gesture.numberOfTouchesRequired = 1;
    m_codeView.userInteractionEnabled=YES;
    [m_codeView addGestureRecognizer:gesture];
    
    /**
      *  根据CIImage生成指定大小的UIImage
     *
     *  @param image CIImage
     *  @param size  图片宽度
     */
     - (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    
    // 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:image fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);
    
    // 2.保存bitmap到图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    return [UIImage imageWithCGImage:scaledImage];
    }

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