- (void)viewDidLoad {
    [super viewDidLoad];
    CGFloat width = KWidth - 50 * 2;
    self.erWeiMaImageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 30, width , width)];
    [self.view addSubview:_erWeiMaImageView];
    [self getErWeiMaImage:@"http://www.wowifi.com/release/app-Download-mobile.html?a=0.34292998714568346"];
}
#pragma mark ========================= 二维码生成 ==============================
-(void)getErWeiMaImage:(NSString *)url
{
    // 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 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
    self.erWeiMaImageView.image = [self createNonInterpolatedUIImageFormCIImage:outputImage withSize:200];
}

/**
 * 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];
}

//带自己LOGO的二维码Demo(转载别人的)
//原地址：http://blog.csdn.net/zhuming3834/article/details/50835659
//https://github.com/YQL539/HGDQQRCode